US20060055594A1 - Method and apparatus for reducing GPS receiver jamming during transmission in a wireless receiver - Google Patents
Method and apparatus for reducing GPS receiver jamming during transmission in a wireless receiver Download PDFInfo
- Publication number
- US20060055594A1 US20060055594A1 US11/209,193 US20919305A US2006055594A1 US 20060055594 A1 US20060055594 A1 US 20060055594A1 US 20919305 A US20919305 A US 20919305A US 2006055594 A1 US2006055594 A1 US 2006055594A1
- Authority
- US
- United States
- Prior art keywords
- signal
- gps receiver
- transceiver
- gps
- replica
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/21—Interference related issues ; Issues related to cross-correlation, spoofing or other methods of denial of service
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B1/0483—Transmitters with multiple parallel paths
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/3805—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving with built-in auxiliary receivers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/50—Circuits using different frequencies for the two directions of communication
- H04B1/52—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
- H04B1/525—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa with means for reducing leakage of transmitter signal into the receiver
Definitions
- the present invention relates in general to wireless transceivers integrated with a Global Positioning System (GPS) receiver, and in particular to a method and apparatus for reducing GPS receiver jamming during transmission by the wireless transceiver.
- GPS Global Positioning System
- Wireless communications systems including cellular telephony, Personal Communication System (PCS) devices, Personal Data Assistants (PDAs), and other wireless handsets and devices, has become commonplace.
- PCS Personal Communication System
- PDAs Personal Data Assistants
- GPS Global Positioning System
- the GPS system transmits at 1.575 GHz, and the cellular and PCS systems transmit at 900 MHz and 1.9 GHz, respectively.
- cellular devices handsets
- the cellular and PCS transmitted signals are extremely strong signals relative to the GPS received signals, and these strong signals or their harmonics can degrade the sensitivity of the GPS receiver during wireless transceiver transmission, unless filtering or other methods are employed to reject the interfering or jamming signal. As such, the reliability and operation of GPS receivers that are used in conjunction with cellular handsets is degraded.
- the present invention discloses a method and apparatus for minimizing the interference between wireless transmissions and the proximate or co-located GPS receiver.
- a method and apparatus for minimizing the interference between wireless transmissions and the proximate or co-located GPS receiver By feedforward of a phase and amplitude adjusted version of the transmitted signal and combining said signal with the composite signal at the input of the GPS receiver, the GPS receiver sensitivity degradation is reduced or eliminated in the case of perfect cancellation, and the GPS receiver is not jammed by the wireless transmissions.
- a single antenna can be used for GPS reception and wireless transmission and reception without unduly complicating the diplexing/filtering network required to separate the multiple signals being transmitted and/or received by the single antenna.
- An apparatus in accordance with the present invention comprises a GPS receiver, an antenna, coupled to the GPS receiver, a transceiver, a second antenna, coupled to the transceiver, coupling means, and a phase and gain adjusting means.
- the coupling means obtains a replica signal from the transceiver, which is selectively phase and gain adjusted and then is provided to the GPS receiver.
- the selectively phase and gain adjusted replica signal reduces interference between a transmitted signal from the transceiver and a signal received by the GPS receiver.
- FIG. 1 illustrates the electromagnetic interference between the wireless and the GPS systems
- FIG. 3 is a flowchart illustrating the steps used to practice the present invention.
- the interference phenomenon is present for any signals that are of a frequency near or within the GPS receiver band, as well as signals that have harmonics that fall near or within the GPS receiver band, or any signals that degrade the GPS receiver.
- the present invention is not limited to cellular and/or PCS applications, but can be used to reduce or eliminate the degradation of GPS receiver sensitivity in other wireless transceiver and GPS receiver applications and/or environments.
- the present invention provides a system solution that uses additional circuitry between the wireless transceiver and GPS receiver, and within the GPS RF front end circuits.
- a correction “replica” signal is obtained from the power-amplifier section of the wireless transceiver.
- the replica signal is then provided to the GPS receiver as an interference cancellation signal.
- the combined wireless transceiver and GPS receiver contains circuitry that allows digitally controlled adjustment of the amplitude and phase of the replica signal, such that when added with the composite signal received by the GPS front end, the net power of undesired wireless signal in said GPS circuit is minimized or nulled.
- the GPS front end circuitry includes a detector which provides the system a relative indication of the power level of the received wireless signal. This signal is digitized and the information is provided to a digital controller, which is typically integrated with the baseband processor. Effectively the system implements a cancellation feedback algorithm, and the immunity of the GPS receiver is achieved independent of the physical design of the handset, allowing great flexibility for the handset designer in selecting the degree of co-location of the GPS and wireless antennas, including the highly desirable case of using a single multi-band antenna. Furthermore, the method requires very little duty factor usage of the receiver's processor or controller. Further, the present invention is useful in handsets of different manufacturers, since the feedback technique of the present invention is useful regardless of handset design.
- FIG. 1 illustrates the electromagnetic interference between the cellular and the GPS systems.
- System 100 comprises a wireless transceiver antenna 102 , which is coupled to a duplexer 104 .
- Duplexer 104 allows the antenna 102 to be used alternatively or simultaneously by a transmitter amplifier (power amplifier (PA)) 106 and a receiver amplifier (Low Noise Amplifier (LNA)) 108 .
- LNA 108 is coupled to a bandpass filter 110 , which is coupled to a frequency converter 112 .
- PA 106 is also coupled to a bandpass filter 114 , which is coupled to the frequency converter 112 .
- Frequency converter 112 is coupled to the IF, frequency synthesis and wireless baseband processor and controller 116 .
- System 100 also comprises a GPS antenna 118 , which may be the same antenna as antenna 102 , but, for ease of illustration of the problem to be solved by the present invention, is shown as a separate antenna 118 .
- Antenna 118 is coupled to a pre-select Radio Freqency (RF) filter 120 , which is coupled to an amplifier 122 .
- the output of amplifier 122 is coupled to another bandpass filter 124 , which is then input to frequency converter 126 .
- the output of frequency converter 126 is delivered to a GPS processor and controller 128 .
- GPS receiver 136 comprises antenna 118 , filter 120 , amplifier 122 , filter 124 , frequency converter 126 , and controller 128 .
- an interference signal 132 occurs when antenna 102 is transmitting wireless system voice data and/or digital or analog data. Since the interference signal 132 so strong and real filters have limited stop band capability, the GPS receiver 136 is desensitized by such a signal either by intermodulation mixing effects which occur within amplifier 122 , or by GPS in band interference contained in signal 130 .
- FIG. 2 illustrates a system in accordance with the present invention.
- System 200 is similar to system 100 , but uses feedback to assist system 200 in canceling the interference signal 132 on GPS receiver 136 .
- Coupler 202 couples a replica version of the transmitted signal output of PA 106 , and delivers the replica signal to blocks 204 and 206 .
- Blocks 204 and 206 can control the phase and amplitude of the replica signal, and blocks 204 and 206 generate resulting signal 208 .
- Coupler 210 then couples resulting signal 208 into the GPS amplifier 122 input.
- the phase and amplitude of resulting signal 208 is adjusted by controller 128 , which can alter the phase and amplitude of signal 208 via control signal paths 212 and 214 respectively.
- controller 128 Receive Signal Strength Indicator (RSSI) 216 is coupled to the incoming received signal after the GPS amplifier 122 , and the output of RSSI 216 is fed into controller 128 .
- the output signal 218 of RSSI 216 is monitored by controller 128 .
- the phase and amplitude of signal 208 are iteratively adjusted according to a minimization search routine, which can be programmed by software in the controller.
- the interference signal 132 will be fixed in phase and amplitude once the wireless device is designed, and the only effects that blocks 204 and 206 will be required to adaptively cancel are long-term drift effects generated in system 200 , or changes of the signal 132 due to external environment changes which affect the coupling between antenna 102 and 118 .
- the added overhead burden of the invention upon controller 128 will cause insignificant power increase after initial setting of the phase and amplitude adjusters within blocks 204 and 206 .
- the feedback loop described in the present invention can be used with any handset design, because the feedback loop can control wide variations of the phase and amplitude of interfering signal 132 .
- filter 120 now filters out most of the transmit signal from transmit amplifier 108 , but cannot do so perfectly, since real filters have non-infinite out-of-band rejection, and therefore some of the transmit signal will be received at the GPS receiver 136 .
- the present invention allows the performance requirements of filter 120 to be relaxed, since the feedback loop created by blocks 204 and 206 allows those portions of the transmitted signal that do pass through filter 120 to be canceled out by signal 208 . Further, the feedback loop can be closed using feedback directly from the GPS receiver 136 instead of through the RSSI 216 if desired. If desired, the baseband controller 116 and the GPS controller 128 can be combined into a single controller 220 .
- FIG. 3 is a flowchart illustrating the steps used to practice the present invention.
- Block 300 illustrates replicating a transmission of the transceiver.
- Block 302 illustrates coupling the replicated transmission into a front end of the GPS receiver.
- Block 304 illustrates at least partially canceling the transmission using the replicated transmission.
- the present invention although described with respect to GPS systems, can be utilized with any Satellite Positioning System (SATPS) without departing from the scope of the present invention.
- SATPS Satellite Positioning System
- transceiver system such as the cellular telephone system
- other wireless or wire-based systems such as Personal Data Assistants, mobile computers, Personal Communications Systems, wireless Local Area Networks (LANs), wireless LANs that are compatible with the “Bluetooth” standards, or other wireless or wire-based systems
- LANs wireless Local Area Networks
- Bluetooth wireless LANs
- the present invention is useful with transmitters as well as transceivers without departing from the scope of the present invention.
- the present invention discloses a method and apparatus for reducing GPS receiver jamming during transmission in a wireless transceiver.
- An apparatus in accordance with the present invention comprises a GPS receiver, an antenna, coupled to the GPS receiver, a transceiver, a second antenna, coupled to the transceiver, coupling means, and a phase and gain adjusting means.
- the coupling means obtains a replica signal from the transceiver, which is selectively phase and gain adjusted and then is provided to the the GPS receiver.
- the selectively phase and gain adjusted replica signal reduces interference between a transmitted signal from the transceiver and a signal received by the GPS receiver.
Abstract
A method and apparatus for minimizing the interference between wireless transmissions and a proximately located or co-located GPS receiver is disclosed. By feedforward of a phase and amplitude adjusted version of the transmitted signal and combining said signal with the composite signal at the input of the GPS receiver, the GPS receiver sensitivity degradation is reduced or eliminated in the case of perfect cancellation, and the GPS receiver is not jammed by the wireless transmissions. The invention allows a single antenna to be implemented for GPS reception and wireless transmission and reception without unduly complicating the diplexing/filtering network required to separate the multiple signals being transmitted and/or received by the single antenna.
Description
- This application claims priority under 35 U.S.C. §119(e) of U.S. Provisional Patent Application No. 60/224,741, filed Aug. 10, 2000, entitled “METHOD AND APPARATUS FOR REDUCING GPS RECEIVER JAMMING DURING TRANSMISSION IN A WIRELESS TRANSCEIVER,” by Richard J. McConnell, et al., which application is incorporated by reference herein.
- 1. Field of the Invention
- The present invention relates in general to wireless transceivers integrated with a Global Positioning System (GPS) receiver, and in particular to a method and apparatus for reducing GPS receiver jamming during transmission by the wireless transceiver.
- 2. Description of the Related Art
- Wireless communications systems, including cellular telephony, Personal Communication System (PCS) devices, Personal Data Assistants (PDAs), and other wireless handsets and devices, has become commonplace. The use of such devices to provide voice, data, and other services, such as internet access, has provided many conveniences to wireless system users.
- Currently, designers are integrating Global Positioning System (GPS) technology into wireless devices and other wireless transceivers. The GPS system transmits at 1.575 GHz, and the cellular and PCS systems transmit at 900 MHz and 1.9 GHz, respectively. Inherent in a device that combines GPS reception and wireless transmission circuitry, which circuitry includes an antenna, undesired electromagnetic coupling between the transmitter of the wireless transceiver and the GPS receiver will occur. Since cellular devices (handsets) are typically small in size, it is desirable to have a device that can share an antenna for use by both the GPS receiver and the wireless transceiver, if this is possible without deleterious performance effects on either system.
- Since the cellular and PCS transmitted signals are extremely strong signals relative to the GPS received signals, and these strong signals or their harmonics can degrade the sensitivity of the GPS receiver during wireless transceiver transmission, unless filtering or other methods are employed to reject the interfering or jamming signal. As such, the reliability and operation of GPS receivers that are used in conjunction with cellular handsets is degraded.
- It can be seen, then, that there is a need in the art for a method of reducing the effects of wireless transmissions on proximate GPS receivers. It can also be seen that there is a need in the art for an apparatus that can reduce the effects of wireless transmissions on GPS receivers. It can also be seen that there is a need in the art for a method and apparatus that can allow GPS receivers and wireless transmitters to share a common antenna.
- To minimize the limitations in the prior art, and to minimize other limitations that will become apparent upon reading and understanding the present specification, the present invention discloses a method and apparatus for minimizing the interference between wireless transmissions and the proximate or co-located GPS receiver. By feedforward of a phase and amplitude adjusted version of the transmitted signal and combining said signal with the composite signal at the input of the GPS receiver, the GPS receiver sensitivity degradation is reduced or eliminated in the case of perfect cancellation, and the GPS receiver is not jammed by the wireless transmissions. Further, a single antenna can be used for GPS reception and wireless transmission and reception without unduly complicating the diplexing/filtering network required to separate the multiple signals being transmitted and/or received by the single antenna.
- An apparatus in accordance with the present invention comprises a GPS receiver, an antenna, coupled to the GPS receiver, a transceiver, a second antenna, coupled to the transceiver, coupling means, and a phase and gain adjusting means. The coupling means obtains a replica signal from the transceiver, which is selectively phase and gain adjusted and then is provided to the GPS receiver. The selectively phase and gain adjusted replica signal reduces interference between a transmitted signal from the transceiver and a signal received by the GPS receiver.
- It is an object of the present invention to provide a method of reducing the effects of wireless transmissions on proximate GPS receivers. It is another object of the present invention to provide an apparatus that can reduce the effects of wireless transmissions on GPS receivers. It is a further object of the present invention to provide a method and apparatus that allows GPS receivers and wireless transceivers to share a common antenna.
- Referring now to the drawings in which like reference numbers represent corresponding parts throughout:
-
FIG. 1 illustrates the electromagnetic interference between the wireless and the GPS systems; -
FIG. 2 illustrates a system in accordance with the present invention; and -
FIG. 3 is a flowchart illustrating the steps used to practice the present invention. - In the following description of the preferred embodiment, reference is made to the accompanying drawings which form a part hereof, and in which is shown by way of illustration a specific embodiment in which the invention may be practiced. It is to be understood that other embodiments may be utilized and structural changes may be made without departing from the scope of the present invention.
- Overview
- It is a known problem that strong signals that fall within or near the GPS RF band will desensitize GPS receiver performance. Since cellular/PCS transmissions can introduce spurrious signals, or overdrive the GPS receiver, solving and/or minimizing the effects of such signals is of special interest for wireless handsets which contain a GPS receiver that must operate during a wireless transmission. Typically in such handsets, the wireless antenna and the GPS antenna are in close proximity or, preferably for low cost, are the same antenna, and the coupling of transmitted power is significant and likely to degrade GPS performance. The present invention describes a method of avoiding or greatly reducing the degree of GPS desensitization that occurs.
- Although described herein with respect to cellular/PCS interference with GPS receivers, the interference phenomenon is present for any signals that are of a frequency near or within the GPS receiver band, as well as signals that have harmonics that fall near or within the GPS receiver band, or any signals that degrade the GPS receiver. The present invention is not limited to cellular and/or PCS applications, but can be used to reduce or eliminate the degradation of GPS receiver sensitivity in other wireless transceiver and GPS receiver applications and/or environments.
- System Overview
- The present invention provides a system solution that uses additional circuitry between the wireless transceiver and GPS receiver, and within the GPS RF front end circuits. A correction “replica” signal is obtained from the power-amplifier section of the wireless transceiver. The replica signal is then provided to the GPS receiver as an interference cancellation signal. The combined wireless transceiver and GPS receiver contains circuitry that allows digitally controlled adjustment of the amplitude and phase of the replica signal, such that when added with the composite signal received by the GPS front end, the net power of undesired wireless signal in said GPS circuit is minimized or nulled.
- The GPS front end circuitry includes a detector which provides the system a relative indication of the power level of the received wireless signal. This signal is digitized and the information is provided to a digital controller, which is typically integrated with the baseband processor. Effectively the system implements a cancellation feedback algorithm, and the immunity of the GPS receiver is achieved independent of the physical design of the handset, allowing great flexibility for the handset designer in selecting the degree of co-location of the GPS and wireless antennas, including the highly desirable case of using a single multi-band antenna. Furthermore, the method requires very little duty factor usage of the receiver's processor or controller. Further, the present invention is useful in handsets of different manufacturers, since the feedback technique of the present invention is useful regardless of handset design.
- Block Diagrams
-
FIG. 1 illustrates the electromagnetic interference between the cellular and the GPS systems.System 100 comprises awireless transceiver antenna 102, which is coupled to aduplexer 104. Duplexer 104 allows theantenna 102 to be used alternatively or simultaneously by a transmitter amplifier (power amplifier (PA)) 106 and a receiver amplifier (Low Noise Amplifier (LNA)) 108. LNA 108 is coupled to abandpass filter 110, which is coupled to afrequency converter 112.PA 106 is also coupled to abandpass filter 114, which is coupled to thefrequency converter 112.Frequency converter 112 is coupled to the IF, frequency synthesis and wireless baseband processor andcontroller 116. -
System 100 also comprises aGPS antenna 118, which may be the same antenna asantenna 102, but, for ease of illustration of the problem to be solved by the present invention, is shown as aseparate antenna 118.Antenna 118 is coupled to a pre-select Radio Freqency (RF)filter 120, which is coupled to anamplifier 122. The output ofamplifier 122 is coupled to anotherbandpass filter 124, which is then input tofrequency converter 126. The output offrequency converter 126 is delivered to a GPS processor andcontroller 128.GPS receiver 136 comprisesantenna 118,filter 120,amplifier 122,filter 124,frequency converter 126, andcontroller 128. - When
antenna 102 is transmittingsignal 130, aninterference signal 132 occurs whenantenna 102 is transmitting wireless system voice data and/or digital or analog data. Since theinterference signal 132 so strong and real filters have limited stop band capability, theGPS receiver 136 is desensitized by such a signal either by intermodulation mixing effects which occur withinamplifier 122, or by GPS in band interference contained insignal 130. -
FIG. 2 illustrates a system in accordance with the present invention.System 200 is similar tosystem 100, but uses feedback to assistsystem 200 in canceling theinterference signal 132 onGPS receiver 136. - Coupler 202 couples a replica version of the transmitted signal output of
PA 106, and delivers the replica signal toblocks Blocks signal 208.Coupler 210 thencouples resulting signal 208 into theGPS amplifier 122 input. - The phase and amplitude of resulting
signal 208 is adjusted bycontroller 128, which can alter the phase and amplitude ofsignal 208 viacontrol signal paths blocks controller 128, Receive Signal Strength Indicator (RSSI) 216 is coupled to the incoming received signal after theGPS amplifier 122, and the output ofRSSI 216 is fed intocontroller 128. Theoutput signal 218 ofRSSI 216 is monitored bycontroller 128. The phase and amplitude ofsignal 208 are iteratively adjusted according to a minimization search routine, which can be programmed by software in the controller. By properly adjusting the phase and amplitude ofsignal 208 viacontroller 128 and blocks 204 and 206, the effects of interferingsignal 132 can be reduced or eliminated. - In most designs, the
interference signal 132 will be fixed in phase and amplitude once the wireless device is designed, and the only effects that blocks 204 and 206 will be required to adaptively cancel are long-term drift effects generated insystem 200, or changes of thesignal 132 due to external environment changes which affect the coupling betweenantenna controller 128 will cause insignificant power increase after initial setting of the phase and amplitude adjusters withinblocks signal 132. - If
antennas filter 120 now filters out most of the transmit signal from transmitamplifier 108, but cannot do so perfectly, since real filters have non-infinite out-of-band rejection, and therefore some of the transmit signal will be received at theGPS receiver 136. The present invention allows the performance requirements offilter 120 to be relaxed, since the feedback loop created byblocks filter 120 to be canceled out bysignal 208. Further, the feedback loop can be closed using feedback directly from theGPS receiver 136 instead of through theRSSI 216 if desired. If desired, thebaseband controller 116 and theGPS controller 128 can be combined into asingle controller 220. - Process Chart
-
FIG. 3 is a flowchart illustrating the steps used to practice the present invention. -
Block 300 illustrates replicating a transmission of the transceiver. -
Block 302 illustrates coupling the replicated transmission into a front end of the GPS receiver. -
Block 304 illustrates at least partially canceling the transmission using the replicated transmission. - Conclusion
- This concludes the description of the preferred embodiment of the invention. The following paragraphs describe some alternative methods of accomplishing the same objects. The present invention, although described with respect to GPS systems, can be utilized with any Satellite Positioning System (SATPS) without departing from the scope of the present invention. Further, although described with respect to a specific transceiver system, such as the cellular telephone system, other wireless or wire-based systems, such as Personal Data Assistants, mobile computers, Personal Communications Systems, wireless Local Area Networks (LANs), wireless LANs that are compatible with the “Bluetooth” standards, or other wireless or wire-based systems, can be used in place of or in conjunction with the cellular system herein described without departing from the scope of the present invention. Further, the present invention is useful with transmitters as well as transceivers without departing from the scope of the present invention.
- In summary, the present invention discloses a method and apparatus for reducing GPS receiver jamming during transmission in a wireless transceiver. An apparatus in accordance with the present invention comprises a GPS receiver, an antenna, coupled to the GPS receiver, a transceiver, a second antenna, coupled to the transceiver, coupling means, and a phase and gain adjusting means. The coupling means obtains a replica signal from the transceiver, which is selectively phase and gain adjusted and then is provided to the the GPS receiver. The selectively phase and gain adjusted replica signal reduces interference between a transmitted signal from the transceiver and a signal received by the GPS receiver.
- The foregoing description of the preferred embodiment of the invention has been presented for the purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise form disclosed. Many modifications and variations are possible in light of the above teaching. It is intended that the scope of the invention not be limited by this detailed description, but by the claims appended hereto.
Claims (17)
1. A wireless mobile terminal system comprising:
a GPS receiver;
an antenna, coupled to the GPS receiver, for allowing the GPS receiver to receive GPS signals transmitted from at least one GPS satellite;
a wireless transceiver;
a second antenna, coupled to the transceiver, for allowing the transceiver to transmit signals and further for allowing the transceiver to receive signals;
a first coupling means, coupled to the transceiver, for obtaining a replica signal from the transceiver, the replica signal being a replica of a signal being transmitted by the transceiver;
a phase and gain adjusting means, with an input coupled to the first coupling means, for accepting and selectively conditioning the replica signal; and
a second coupling means, coupled to the output of the phase and gain adjusting means, for providing the selectively phase and gain adjusted replica signal to the GPS receiver, wherein the selectively phase and gain adjusted replica signal reduces interference between a transmitted signal from the transceiver and a signal received by the GPS receiver.
2. The GPS receiver system of claim 1 , wherein the antenna and the second antenna are a single antenna.
3. The GPS receiver system of claim 2 , wherein the phase and gain adjusting means uses a feedback loop to reduce the interference between the transmitted signal from the transceiver and the signal received by the GPS receiver.
4. The GPS receiver system of claim 3 , wherein the replica of the transmitted signal is used to cancel interference between the transmitted signal and the signal received by the GPS receiver.
5. The GPS receiver system of claim 4 , wherein the replica of the transmitted signal is adjusted in phase.
6. The GPS receiver system of claim 5 , wherein the replica of the transmitted signal is shifted in amplitude.
7. The GPS receiver system of claim 6 , wherein the phase shift of the transmitted signal and the amplitude shift of the transmitted signal are controlled by a received signal strength indicator.
8. The GPS receiver system of claim 7 , wherein the combining circuit further comprises an adaptive circuit.
9. The GPS receiver system of claim 8 , wherein the adaptive circuit minimizes long-term drift effects.
10. A method for reducing interference in a Global Positioning System (GPS) receiver that shares an antenna with a transceiver, comprising the steps of:
replicating a first transmission of the transceiver, wherein the first transmission of the transceiver emanates from an antenna receiving GPS signals;
coupling the replicated transmission into a front end of the GPS receiver; and
at least partially canceling the first transmission using the replicated transmission.
11. The method of claim 10 , wherin the partial cancellation is performed using a feedback loop.
12. The method of claim 11 , wherein the feedback loop uses a replica of the transmitted signal.
13. The method of claim 12 , further comprising phase shifting the replicated signal.
14. The method of claim 13 , further comprising amplitude shifting the replicated signal.
15. The method of claim 14 , further comprising controlling the phase shifting of the replicated signal and the amplitude shifting of the replicated signal by using a received signal strength indicator.
16. The method of claim 15 , further comprising minimizing long-term drift effects.
17. The method of claim 16 , wherein the minimizing of long-term drift effects is performed by an adaptive circuit.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/209,193 US20060055594A1 (en) | 2000-08-10 | 2005-08-22 | Method and apparatus for reducing GPS receiver jamming during transmission in a wireless receiver |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US22474100P | 2000-08-10 | 2000-08-10 | |
US09/920,898 US6961019B1 (en) | 2000-08-10 | 2001-08-02 | Method and apparatus for reducing GPS receiver jamming during transmission in a wireless receiver |
US11/209,193 US20060055594A1 (en) | 2000-08-10 | 2005-08-22 | Method and apparatus for reducing GPS receiver jamming during transmission in a wireless receiver |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/920,898 Continuation US6961019B1 (en) | 2000-08-10 | 2001-08-02 | Method and apparatus for reducing GPS receiver jamming during transmission in a wireless receiver |
Publications (1)
Publication Number | Publication Date |
---|---|
US20060055594A1 true US20060055594A1 (en) | 2006-03-16 |
Family
ID=35150795
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/920,898 Expired - Fee Related US6961019B1 (en) | 2000-08-10 | 2001-08-02 | Method and apparatus for reducing GPS receiver jamming during transmission in a wireless receiver |
US11/209,193 Abandoned US20060055594A1 (en) | 2000-08-10 | 2005-08-22 | Method and apparatus for reducing GPS receiver jamming during transmission in a wireless receiver |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/920,898 Expired - Fee Related US6961019B1 (en) | 2000-08-10 | 2001-08-02 | Method and apparatus for reducing GPS receiver jamming during transmission in a wireless receiver |
Country Status (1)
Country | Link |
---|---|
US (2) | US6961019B1 (en) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050101346A1 (en) * | 2003-11-07 | 2005-05-12 | Steve Wozniak | Receiver device and method using GPS baseband correlator circuitry for despreading both GPS and local wireless baseband signals |
US20080143586A1 (en) * | 2006-12-13 | 2008-06-19 | Seiko Epson Corporation | Receiver circuit, electronic instrument, and signal processing method |
US20090029666A1 (en) * | 2007-07-24 | 2009-01-29 | Seiko Epson Corporation | Noise cancellation method, receiver circuit, and electronic instrument |
US20090080669A1 (en) * | 2007-09-26 | 2009-03-26 | Seiko Epson Corporation | Noise cancel method, noise cancel type amplifying circuit, and receiving circuit and electronic device including noise cancel type amplifying circuit |
US20100054310A1 (en) * | 2006-11-14 | 2010-03-04 | Nxp, B.V. | Method of acquiring a received spread spectrum signal |
US20130003783A1 (en) * | 2011-06-29 | 2013-01-03 | Qualcomm Incorporation | Global navigation satellite system receiver with filter bypass mode for improved sensitivity |
KR101220049B1 (en) * | 2006-12-18 | 2013-01-18 | 엘지이노텍 주식회사 | Terminating system of interference signal |
US20170353202A1 (en) * | 2016-06-06 | 2017-12-07 | Airbus Ds Slc | Device and method for processing a signal received by a receiver disrupted by a transmitter |
EP3570446A1 (en) * | 2018-05-16 | 2019-11-20 | Nokia Solutions and Networks Oy | Echo cancellation in a multiport data transceiver |
Families Citing this family (46)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6961019B1 (en) * | 2000-08-10 | 2005-11-01 | Sirf Technology, Inc. | Method and apparatus for reducing GPS receiver jamming during transmission in a wireless receiver |
US8126889B2 (en) | 2002-03-28 | 2012-02-28 | Telecommunication Systems, Inc. | Location fidelity adjustment based on mobile subscriber privacy profile |
WO2004008782A2 (en) * | 2002-07-15 | 2004-01-22 | Quellan, Inc. | Adaptive noise filtering and equalization |
AU2003287628A1 (en) | 2002-11-12 | 2004-06-03 | Quellan, Inc. | High-speed analog-to-digital conversion with improved robustness to timing uncertainty |
FI115879B (en) * | 2003-03-07 | 2005-07-29 | Nokia Corp | Channel selection in wireless communication system |
US8253624B2 (en) * | 2003-06-02 | 2012-08-28 | Motorola Mobility Llc | Detection and reduction of periodic jamming signals in GPS receivers and methods therefor |
DE60332170D1 (en) * | 2003-06-10 | 2010-05-27 | Nokia Corp | IMPROVING THE BENEFITS OF A RECIPIENT IN INTERFERENCE TERMS |
EP1940040B1 (en) * | 2003-06-10 | 2011-03-16 | Nokia Corporation | Improving the performance of a receiver in interfering conditions |
KR100531879B1 (en) * | 2003-07-09 | 2005-11-29 | 엘지전자 주식회사 | Radio frequency reception circuit for mobile phone |
US7804760B2 (en) | 2003-08-07 | 2010-09-28 | Quellan, Inc. | Method and system for signal emulation |
WO2005018134A2 (en) | 2003-08-07 | 2005-02-24 | Quellan, Inc. | Method and system for crosstalk cancellation |
KR101197810B1 (en) | 2003-11-17 | 2012-11-05 | ?란 인코포레이티드 | Method and system for antenna interference cancellation |
US7424293B2 (en) | 2003-12-02 | 2008-09-09 | Telecommunication Systems, Inc. | User plane location based service using message tunneling to support roaming |
US7616700B2 (en) | 2003-12-22 | 2009-11-10 | Quellan, Inc. | Method and system for slicing a communication signal |
US7340280B2 (en) * | 2004-02-26 | 2008-03-04 | Nokia Corporation | Method of configuring base station, and base station |
US7675891B2 (en) * | 2004-09-23 | 2010-03-09 | Telefonakiebolaget L M Ericsson (Publ) | Multimedia reception in communication networks |
US7629926B2 (en) | 2004-10-15 | 2009-12-08 | Telecommunication Systems, Inc. | Culled satellite ephemeris information for quick, accurate assisted locating satellite location determination for cell site antennas |
JP4214992B2 (en) * | 2004-12-13 | 2009-01-28 | パナソニック株式会社 | High frequency receiver, integrated circuit used therefor, portable device using the same, transmitter used therefor, and method for manufacturing the high frequency receiver and the portable device |
US7725079B2 (en) | 2004-12-14 | 2010-05-25 | Quellan, Inc. | Method and system for automatic control in an interference cancellation device |
US7522883B2 (en) | 2004-12-14 | 2009-04-21 | Quellan, Inc. | Method and system for reducing signal interference |
US20060214845A1 (en) * | 2005-03-23 | 2006-09-28 | Magnus Jendbro | Global positioning system (GPS) accessories, hosts and methods that use radio frequency transmission of raw GPS data |
US7353034B2 (en) | 2005-04-04 | 2008-04-01 | X One, Inc. | Location sharing and tracking using mobile phones or other wireless devices |
US8660573B2 (en) | 2005-07-19 | 2014-02-25 | Telecommunications Systems, Inc. | Location service requests throttling |
EP1835627A1 (en) * | 2006-03-14 | 2007-09-19 | Motorola, Inc. | Method and apparatus for reducing out-of-band interference generated by a bluetooth device |
KR101372361B1 (en) | 2006-04-26 | 2014-03-12 | 인터실 아메리카스 엘엘씨 | Method and system for reducing radiated emissions from a communications channel |
JP4904906B2 (en) * | 2006-04-27 | 2012-03-28 | パナソニック株式会社 | Receiving device and electronic device using the same |
KR100744913B1 (en) * | 2006-05-16 | 2007-08-01 | 삼성전기주식회사 | Mobile terminal and mothed for removing interfering phase-noise in the mobile terminal |
KR100842522B1 (en) * | 2006-11-27 | 2008-07-01 | 삼성전자주식회사 | Method and apparatus for cancelling interference in a hybrid terminal which supports both broadcasting and mobile communication services and the hybrid terminal |
US7738586B2 (en) * | 2007-01-23 | 2010-06-15 | Infineon Technologies Ag | Wireless communication device and method for reducing in-band interference in a GPS receiver |
US7605753B2 (en) * | 2007-01-23 | 2009-10-20 | Joakim Landmark | Wireless communication device and method for reducing interference in a receiver |
WO2008107812A1 (en) * | 2007-03-05 | 2008-09-12 | Nxp B.V. | System and method for processing a received signal |
US8026845B2 (en) * | 2007-04-16 | 2011-09-27 | Qualcomm Incorporated | Positioning and transmitting system |
EP2196014A4 (en) | 2007-09-17 | 2014-12-24 | Telecomm Systems Inc | Emergency 911 data messaging |
WO2009087532A1 (en) * | 2008-01-03 | 2009-07-16 | Nxp B.V. | System for implementing mobile television in wireless terminal |
US8068587B2 (en) | 2008-08-22 | 2011-11-29 | Telecommunication Systems, Inc. | Nationwide table routing of voice over internet protocol (VOIP) emergency calls |
JP5174632B2 (en) * | 2008-11-27 | 2013-04-03 | アルプス電気株式会社 | Television broadcast receiver circuit |
GB0822967D0 (en) * | 2008-12-16 | 2009-07-29 | Era Tech Ltd | Use of Steering in Interference Cancellation with Application to Communication through Disnal Jamming |
US8867485B2 (en) | 2009-05-05 | 2014-10-21 | Telecommunication Systems, Inc. | Multiple location retrieval function (LRF) network having location continuity |
US9008249B2 (en) | 2012-02-10 | 2015-04-14 | Qualcomm Incorporated | Detection and filtering of an undesired narrowband signal contribution in a wireless signal receiver |
US9065686B2 (en) | 2012-11-21 | 2015-06-23 | Qualcomm Incorporated | Spur detection, cancellation and tracking in a wireless signal receiver |
US10591609B1 (en) | 2017-01-11 | 2020-03-17 | Telephonics Corp. | System and method for providing accurate position location information to military forces in a disadvantaged signal environment |
FR3064853B1 (en) * | 2017-03-31 | 2019-03-22 | Continental Automotive France | METHOD AND SENSOR FOR DETECTING THE PRESENCE OF COCANAL INTERFERENCE |
FR3067191B1 (en) * | 2017-06-01 | 2019-06-21 | Continental Automotive France | METHOD FOR REMOVING ELECTROMAGNETIC INTERFERENCE IN AN AMPLITUDE MODULE RADIO SIGNAL, IN PARTICULAR RECEIVED IN AN ELECTRIC OR HYBRID VEHICLE |
FR3067189B1 (en) * | 2017-06-01 | 2020-06-12 | Continental Automotive France | METHOD FOR THE SPATIAL AND TIME SUPPRESSION OF MULTI-PATH INTERFERENCE FOR A FREQUENCY MODULATED RADIO SIGNAL RECEIVER |
FR3067186B1 (en) * | 2017-06-01 | 2019-06-21 | Continental Automotive France | METHOD FOR REMOVING MULTI-PATH SIGNALS FOR FREQUENCY MODULATED RADIO SIGNAL RECEIVER |
JP7280173B2 (en) * | 2019-12-12 | 2023-05-23 | パナソニックホールディングス株式会社 | Radio wave measuring device |
Citations (50)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5420592A (en) * | 1993-04-05 | 1995-05-30 | Radix Technologies, Inc. | Separated GPS sensor and processing system for remote GPS sensing and centralized ground station processing for remote mobile position and velocity determinations |
US5574978A (en) * | 1994-05-12 | 1996-11-12 | American Nucleonics Corporation | Interference cancellation system and radio system for multiple radios on a small platform |
US5663734A (en) * | 1995-10-09 | 1997-09-02 | Precision Tracking, Inc. | GPS receiver and method for processing GPS signals |
US5663735A (en) * | 1996-05-20 | 1997-09-02 | Trimble Navigation Limited | GPS receiver using a radio signal for improving time to first fix |
US5812087A (en) * | 1997-02-03 | 1998-09-22 | Snaptrack, Inc. | Method and apparatus for satellite positioning system based time measurement |
US5825327A (en) * | 1996-03-08 | 1998-10-20 | Snaptrack, Inc. | GPS receivers and garments containing GPS receivers and methods for using these GPS receivers |
US5831574A (en) * | 1996-03-08 | 1998-11-03 | Snaptrack, Inc. | Method and apparatus for determining the location of an object which may have an obstructed view of the sky |
US5841396A (en) * | 1996-03-08 | 1998-11-24 | Snaptrack, Inc. | GPS receiver utilizing a communication link |
US5884214A (en) * | 1996-09-06 | 1999-03-16 | Snaptrack, Inc. | GPS receiver and method for processing GPS signals |
US5893044A (en) * | 1997-01-21 | 1999-04-06 | Motorola Inc. | Real time clock apparatus for fast acquisition or GPS signals |
US5945944A (en) * | 1996-03-08 | 1999-08-31 | Snaptrack, Inc. | Method and apparatus for determining time for GPS receivers |
US5999124A (en) * | 1998-04-22 | 1999-12-07 | Snaptrack, Inc, | Satellite positioning system augmentation with wireless communication signals |
US5999795A (en) * | 1997-09-10 | 1999-12-07 | Starlink Inc. | RF GPS long cable driver |
US6002363A (en) * | 1996-03-08 | 1999-12-14 | Snaptrack, Inc. | Combined GPS positioning system and communications system utilizing shared circuitry |
US6016119A (en) * | 1995-10-09 | 2000-01-18 | Snaptrack, Inc. | Method and apparatus for determining the location of an object which may have an obstructed view of the sky |
US6038248A (en) * | 1996-11-06 | 2000-03-14 | Imec Vzw | Method and apparatus for receiving and converting spread spectrum signals |
US6061018A (en) * | 1998-05-05 | 2000-05-09 | Snaptrack, Inc. | Method and system for using altitude information in a satellite positioning system |
US6075987A (en) * | 1998-02-27 | 2000-06-13 | Ericsson Inc. | Stand alone global positioning system (GPS) and method with high sensitivity |
US6097974A (en) * | 1997-12-12 | 2000-08-01 | Ericsson Inc. | Combined GPS and wide bandwidth radiotelephone terminals and methods |
US6104338A (en) * | 1998-05-04 | 2000-08-15 | Snaptrack, Inc. | Method and apparatus for operating a satellite positioning system receiver |
US6104340A (en) * | 1995-10-09 | 2000-08-15 | Snaptrack, Inc. | GPS receiver and method for processing GPS signals |
US6107960A (en) * | 1998-01-20 | 2000-08-22 | Snaptrack, Inc. | Reducing cross-interference in a combined GPS receiver and communication system |
US6131067A (en) * | 1995-10-09 | 2000-10-10 | Snaptrack, Inc. | Client-server based remote locator device |
US6133873A (en) * | 1998-06-03 | 2000-10-17 | Krasner; Norman F. | Method and apparatus for adaptively processing GPS signals in a GPS receiver |
US6133874A (en) * | 1996-03-08 | 2000-10-17 | Snaptrack, Inc. | Method and apparatus for acquiring satellite positioning system signals |
US6185427B1 (en) * | 1996-09-06 | 2001-02-06 | Snaptrack, Inc. | Distributed satellite position system processing and application network |
US6204808B1 (en) * | 1998-08-13 | 2001-03-20 | Ericsson Inc. | Method and system for aiding GPS receivers via a cellular or PCS network |
US6208291B1 (en) * | 1998-05-29 | 2001-03-27 | Snaptrack, Inc. | Highly parallel GPS correlator system and method |
US6208290B1 (en) * | 1996-03-08 | 2001-03-27 | Snaptrack, Inc. | GPS receiver utilizing a communication link |
US6215442B1 (en) * | 1997-02-03 | 2001-04-10 | Snaptrack, Inc. | Method and apparatus for determining time in a satellite positioning system |
US6215441B1 (en) * | 1997-04-15 | 2001-04-10 | Snaptrack, Inc. | Satellite positioning reference system and method |
US6229992B1 (en) * | 1994-11-15 | 2001-05-08 | University Of Bristol | Full-duplex radio transmitter/receiver |
US6236354B1 (en) * | 1998-07-02 | 2001-05-22 | Snaptrack, Inc. | Reducing satellite signal interference in a global positioning system receiver |
US6259399B1 (en) * | 1995-10-09 | 2001-07-10 | Snaptrack, Inc. | GPS receivers and garments containing GPS receivers and methods for using these GPS receivers |
US6289041B1 (en) * | 1997-02-11 | 2001-09-11 | Snaptrack, Inc. | Fast Acquisition, high sensitivity GPS receiver |
US6295023B1 (en) * | 2000-01-21 | 2001-09-25 | Ericsson Inc. | Methods, mobile stations and systems for acquiring global positioning system timing information |
US6313786B1 (en) * | 1998-07-02 | 2001-11-06 | Snaptrack, Inc. | Method and apparatus for measurement processing of satellite positioning system (SPS) signals |
US6314308B1 (en) * | 1998-07-02 | 2001-11-06 | Snaptrack, Inc. | Method and apparatus for providing reserve power in a cellular telephone |
US6377209B1 (en) * | 1997-02-03 | 2002-04-23 | Snaptrack, Inc. | Method and apparatus for satellite positioning system (SPS) time measurement |
US6411892B1 (en) * | 2000-07-13 | 2002-06-25 | Global Locate, Inc. | Method and apparatus for locating mobile receivers using a wide area reference network for propagating ephemeris |
US6411254B1 (en) * | 1997-04-15 | 2002-06-25 | Snaptrack, Inc. | Satellite positioning reference system and method |
US6417801B1 (en) * | 2000-11-17 | 2002-07-09 | Global Locate, Inc. | Method and apparatus for time-free processing of GPS signals |
US6429814B1 (en) * | 2000-11-17 | 2002-08-06 | Global Locate, Inc. | Method and apparatus for enhancing a global positioning system with terrain model |
US6442375B1 (en) * | 1999-07-14 | 2002-08-27 | Ericsson Inc. | Systems and methods for maintaining operation of a receiver co-located with a transmitter and susceptible to interference therefrom by desensitization of the receiver |
US6453237B1 (en) * | 1999-04-23 | 2002-09-17 | Global Locate, Inc. | Method and apparatus for locating and providing services to mobile devices |
US6466163B2 (en) * | 2000-01-31 | 2002-10-15 | Sony Corporation | GPS receiver and portable communication apparatus |
US6507728B1 (en) * | 1998-07-27 | 2003-01-14 | Nec Corporation | Radio transceiver and a method of preventing transmission spurious response |
US6510308B1 (en) * | 1999-08-24 | 2003-01-21 | Telefonaktiebolaget Lm Ericsson (Publ) | Reception of weak radio frequency signal in the presence of a strong internal radio frequency interferer—device and method for compensation of an internal interfering signal by a superposition method |
US20030122706A1 (en) * | 2000-03-09 | 2003-07-03 | Choi Hee Youn | Hybrid method and system of the improved bidirectional gps and cellular/pcs |
US6961019B1 (en) * | 2000-08-10 | 2005-11-01 | Sirf Technology, Inc. | Method and apparatus for reducing GPS receiver jamming during transmission in a wireless receiver |
-
2001
- 2001-08-02 US US09/920,898 patent/US6961019B1/en not_active Expired - Fee Related
-
2005
- 2005-08-22 US US11/209,193 patent/US20060055594A1/en not_active Abandoned
Patent Citations (69)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5420592A (en) * | 1993-04-05 | 1995-05-30 | Radix Technologies, Inc. | Separated GPS sensor and processing system for remote GPS sensing and centralized ground station processing for remote mobile position and velocity determinations |
US5574978A (en) * | 1994-05-12 | 1996-11-12 | American Nucleonics Corporation | Interference cancellation system and radio system for multiple radios on a small platform |
US6229992B1 (en) * | 1994-11-15 | 2001-05-08 | University Of Bristol | Full-duplex radio transmitter/receiver |
US6542821B2 (en) * | 1995-10-09 | 2003-04-01 | Snaptrack, Inc. | GPS receiver and method for processing GPS signals |
US5781156A (en) * | 1995-10-09 | 1998-07-14 | Snaptrack, Inc. | GPS receiver and method for processing GPS signals |
US6259399B1 (en) * | 1995-10-09 | 2001-07-10 | Snaptrack, Inc. | GPS receivers and garments containing GPS receivers and methods for using these GPS receivers |
US6016119A (en) * | 1995-10-09 | 2000-01-18 | Snaptrack, Inc. | Method and apparatus for determining the location of an object which may have an obstructed view of the sky |
US6421002B2 (en) * | 1995-10-09 | 2002-07-16 | Snaptrack, Inc. | GPS receiver utilizing a communication link |
US5663734A (en) * | 1995-10-09 | 1997-09-02 | Precision Tracking, Inc. | GPS receiver and method for processing GPS signals |
US5874914A (en) * | 1995-10-09 | 1999-02-23 | Snaptrack, Inc. | GPS receiver utilizing a communication link |
US6133871A (en) * | 1995-10-09 | 2000-10-17 | Snaptrack, Inc. | GPS receiver having power management |
US6131067A (en) * | 1995-10-09 | 2000-10-10 | Snaptrack, Inc. | Client-server based remote locator device |
US6104340A (en) * | 1995-10-09 | 2000-08-15 | Snaptrack, Inc. | GPS receiver and method for processing GPS signals |
US6064336A (en) * | 1995-10-09 | 2000-05-16 | Snaptrack, Inc. | GPS receiver utilizing a communication link |
US5945944A (en) * | 1996-03-08 | 1999-08-31 | Snaptrack, Inc. | Method and apparatus for determining time for GPS receivers |
US5825327A (en) * | 1996-03-08 | 1998-10-20 | Snaptrack, Inc. | GPS receivers and garments containing GPS receivers and methods for using these GPS receivers |
US6002363A (en) * | 1996-03-08 | 1999-12-14 | Snaptrack, Inc. | Combined GPS positioning system and communications system utilizing shared circuitry |
US5831574A (en) * | 1996-03-08 | 1998-11-03 | Snaptrack, Inc. | Method and apparatus for determining the location of an object which may have an obstructed view of the sky |
US6208290B1 (en) * | 1996-03-08 | 2001-03-27 | Snaptrack, Inc. | GPS receiver utilizing a communication link |
US5841396A (en) * | 1996-03-08 | 1998-11-24 | Snaptrack, Inc. | GPS receiver utilizing a communication link |
US6150980A (en) * | 1996-03-08 | 2000-11-21 | Snaptrack, Inc. | Method and apparatus for determining time for GPS receivers |
US6133874A (en) * | 1996-03-08 | 2000-10-17 | Snaptrack, Inc. | Method and apparatus for acquiring satellite positioning system signals |
US6111540A (en) * | 1996-03-08 | 2000-08-29 | Snaptrack, Inc. | Combined GPS positioning system and communications system utilizing shared circuitry |
US5663735A (en) * | 1996-05-20 | 1997-09-02 | Trimble Navigation Limited | GPS receiver using a radio signal for improving time to first fix |
US5884214A (en) * | 1996-09-06 | 1999-03-16 | Snaptrack, Inc. | GPS receiver and method for processing GPS signals |
US6272430B1 (en) * | 1996-09-06 | 2001-08-07 | Snaptrack, Inc. | GPS receiver and method for processing GPS signals |
US6185427B1 (en) * | 1996-09-06 | 2001-02-06 | Snaptrack, Inc. | Distributed satellite position system processing and application network |
US6038248A (en) * | 1996-11-06 | 2000-03-14 | Imec Vzw | Method and apparatus for receiving and converting spread spectrum signals |
US5893044A (en) * | 1997-01-21 | 1999-04-06 | Motorola Inc. | Real time clock apparatus for fast acquisition or GPS signals |
US5812087A (en) * | 1997-02-03 | 1998-09-22 | Snaptrack, Inc. | Method and apparatus for satellite positioning system based time measurement |
US6597311B2 (en) * | 1997-02-03 | 2003-07-22 | Snaptrack, Inc. | Method and apparatus for determining time in a satellite positioning system |
US6583757B2 (en) * | 1997-02-03 | 2003-06-24 | Snaptrack, Inc. | Method and apparatus for satellite positioning system (SPS) time measurement |
US6377209B1 (en) * | 1997-02-03 | 2002-04-23 | Snaptrack, Inc. | Method and apparatus for satellite positioning system (SPS) time measurement |
US6052081A (en) * | 1997-02-03 | 2000-04-18 | Snaptrack, Inc. | Method and apparatus for satellite positioning system based time measurement |
US6215442B1 (en) * | 1997-02-03 | 2001-04-10 | Snaptrack, Inc. | Method and apparatus for determining time in a satellite positioning system |
US6239742B1 (en) * | 1997-02-03 | 2001-05-29 | Snaptrack, Inc. | Method and apparatus for satellite positioning system based time measurement |
US6433731B1 (en) * | 1997-02-03 | 2002-08-13 | Snaptrack, Inc. | Method and apparatus for determining time in a satellite positioning system |
US6289041B1 (en) * | 1997-02-11 | 2001-09-11 | Snaptrack, Inc. | Fast Acquisition, high sensitivity GPS receiver |
US6411254B1 (en) * | 1997-04-15 | 2002-06-25 | Snaptrack, Inc. | Satellite positioning reference system and method |
US6215441B1 (en) * | 1997-04-15 | 2001-04-10 | Snaptrack, Inc. | Satellite positioning reference system and method |
US5999795A (en) * | 1997-09-10 | 1999-12-07 | Starlink Inc. | RF GPS long cable driver |
US6097974A (en) * | 1997-12-12 | 2000-08-01 | Ericsson Inc. | Combined GPS and wide bandwidth radiotelephone terminals and methods |
US6107960A (en) * | 1998-01-20 | 2000-08-22 | Snaptrack, Inc. | Reducing cross-interference in a combined GPS receiver and communication system |
US6075987A (en) * | 1998-02-27 | 2000-06-13 | Ericsson Inc. | Stand alone global positioning system (GPS) and method with high sensitivity |
US5999124A (en) * | 1998-04-22 | 1999-12-07 | Snaptrack, Inc, | Satellite positioning system augmentation with wireless communication signals |
US6104338A (en) * | 1998-05-04 | 2000-08-15 | Snaptrack, Inc. | Method and apparatus for operating a satellite positioning system receiver |
US6307504B1 (en) * | 1998-05-05 | 2001-10-23 | Snaptrack, Inc. | Method and system for using altitude information in a satellite positioning system |
US6061018A (en) * | 1998-05-05 | 2000-05-09 | Snaptrack, Inc. | Method and system for using altitude information in a satellite positioning system |
US6208291B1 (en) * | 1998-05-29 | 2001-03-27 | Snaptrack, Inc. | Highly parallel GPS correlator system and method |
US6133873A (en) * | 1998-06-03 | 2000-10-17 | Krasner; Norman F. | Method and apparatus for adaptively processing GPS signals in a GPS receiver |
US6408196B2 (en) * | 1998-07-02 | 2002-06-18 | Snaptrack, Inc. | Method and apparatus for providing reserve power in a cellular telephone |
US6314308B1 (en) * | 1998-07-02 | 2001-11-06 | Snaptrack, Inc. | Method and apparatus for providing reserve power in a cellular telephone |
US6313786B1 (en) * | 1998-07-02 | 2001-11-06 | Snaptrack, Inc. | Method and apparatus for measurement processing of satellite positioning system (SPS) signals |
US6236354B1 (en) * | 1998-07-02 | 2001-05-22 | Snaptrack, Inc. | Reducing satellite signal interference in a global positioning system receiver |
US6507728B1 (en) * | 1998-07-27 | 2003-01-14 | Nec Corporation | Radio transceiver and a method of preventing transmission spurious response |
US6204808B1 (en) * | 1998-08-13 | 2001-03-20 | Ericsson Inc. | Method and system for aiding GPS receivers via a cellular or PCS network |
US6484097B2 (en) * | 1999-04-23 | 2002-11-19 | Global Locate, Inc. | Wide area inverse differential GPS |
US6453237B1 (en) * | 1999-04-23 | 2002-09-17 | Global Locate, Inc. | Method and apparatus for locating and providing services to mobile devices |
US6487499B1 (en) * | 1999-04-23 | 2002-11-26 | Global Locate, Inc. | Method for adjusting a pseudo-range model |
US6510387B2 (en) * | 1999-04-23 | 2003-01-21 | Global Locate, Inc. | Correction of a pseudo-range model from a GPS almanac |
US6442375B1 (en) * | 1999-07-14 | 2002-08-27 | Ericsson Inc. | Systems and methods for maintaining operation of a receiver co-located with a transmitter and susceptible to interference therefrom by desensitization of the receiver |
US6510308B1 (en) * | 1999-08-24 | 2003-01-21 | Telefonaktiebolaget Lm Ericsson (Publ) | Reception of weak radio frequency signal in the presence of a strong internal radio frequency interferer—device and method for compensation of an internal interfering signal by a superposition method |
US6295023B1 (en) * | 2000-01-21 | 2001-09-25 | Ericsson Inc. | Methods, mobile stations and systems for acquiring global positioning system timing information |
US6466163B2 (en) * | 2000-01-31 | 2002-10-15 | Sony Corporation | GPS receiver and portable communication apparatus |
US20030122706A1 (en) * | 2000-03-09 | 2003-07-03 | Choi Hee Youn | Hybrid method and system of the improved bidirectional gps and cellular/pcs |
US6411892B1 (en) * | 2000-07-13 | 2002-06-25 | Global Locate, Inc. | Method and apparatus for locating mobile receivers using a wide area reference network for propagating ephemeris |
US6961019B1 (en) * | 2000-08-10 | 2005-11-01 | Sirf Technology, Inc. | Method and apparatus for reducing GPS receiver jamming during transmission in a wireless receiver |
US6429814B1 (en) * | 2000-11-17 | 2002-08-06 | Global Locate, Inc. | Method and apparatus for enhancing a global positioning system with terrain model |
US6417801B1 (en) * | 2000-11-17 | 2002-07-09 | Global Locate, Inc. | Method and apparatus for time-free processing of GPS signals |
Cited By (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050101346A1 (en) * | 2003-11-07 | 2005-05-12 | Steve Wozniak | Receiver device and method using GPS baseband correlator circuitry for despreading both GPS and local wireless baseband signals |
US8559555B2 (en) | 2006-11-14 | 2013-10-15 | Nxp B.V. | Method of acquiring a received spread spectrum signal |
US20100054310A1 (en) * | 2006-11-14 | 2010-03-04 | Nxp, B.V. | Method of acquiring a received spread spectrum signal |
US20080143586A1 (en) * | 2006-12-13 | 2008-06-19 | Seiko Epson Corporation | Receiver circuit, electronic instrument, and signal processing method |
US7979029B2 (en) * | 2006-12-13 | 2011-07-12 | Seiko Epson Corporation | Receiver circuit, electronic instrument, and signal processing method |
US20110237215A1 (en) * | 2006-12-13 | 2011-09-29 | Seiko Epson Corporation | Receiver circuit, electronic instrument, and signal processing method |
US8340583B2 (en) | 2006-12-13 | 2012-12-25 | Seiko Epson Corporation | Receiver circuit, electronic instrument, and signal processing method |
KR101220049B1 (en) * | 2006-12-18 | 2013-01-18 | 엘지이노텍 주식회사 | Terminating system of interference signal |
US20090029666A1 (en) * | 2007-07-24 | 2009-01-29 | Seiko Epson Corporation | Noise cancellation method, receiver circuit, and electronic instrument |
US20090080669A1 (en) * | 2007-09-26 | 2009-03-26 | Seiko Epson Corporation | Noise cancel method, noise cancel type amplifying circuit, and receiving circuit and electronic device including noise cancel type amplifying circuit |
US20130003783A1 (en) * | 2011-06-29 | 2013-01-03 | Qualcomm Incorporation | Global navigation satellite system receiver with filter bypass mode for improved sensitivity |
US9882602B2 (en) * | 2011-06-29 | 2018-01-30 | Qualcomm Incorporated | Global navigation satellite system receiver with filter bypass mode for improved sensitivity |
US20170353202A1 (en) * | 2016-06-06 | 2017-12-07 | Airbus Ds Slc | Device and method for processing a signal received by a receiver disrupted by a transmitter |
FR3052311A1 (en) * | 2016-06-06 | 2017-12-08 | Airbus Ds Slc | DEVICE AND METHOD FOR PROCESSING A SIGNAL RECEIVED BY A PERTURBE RECEIVER BY A TRANSMITTER |
EP3255802A1 (en) * | 2016-06-06 | 2017-12-13 | Airbus DS SLC | Device and method for processing a signal received by a receiver disrupted by a transmitter |
US10056927B2 (en) * | 2016-06-06 | 2018-08-21 | Airbus Ds Slc | Device and method for processing a signal received by a receiver disrupted by a transmitter |
EP3570446A1 (en) * | 2018-05-16 | 2019-11-20 | Nokia Solutions and Networks Oy | Echo cancellation in a multiport data transceiver |
US10826559B2 (en) | 2018-05-16 | 2020-11-03 | Nokia Solutions And Networks Oy | Echo cancellation in a multiport data transceiver |
Also Published As
Publication number | Publication date |
---|---|
US6961019B1 (en) | 2005-11-01 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US6961019B1 (en) | Method and apparatus for reducing GPS receiver jamming during transmission in a wireless receiver | |
US6993297B2 (en) | Apparatus and methods for tuning antenna impedance using transmitter and receiver parameters | |
US8521090B2 (en) | Systems, methods, and apparatuses for reducing interference at the front-end of a communications receiving device | |
US7542727B2 (en) | Method for receiving a signal on a single multi-band antenna | |
EP2359484B1 (en) | Interface for wireless communication devices | |
US7395042B2 (en) | Enhancing signals in a two-way radio system | |
US20040106381A1 (en) | Transmit signal cancellation in wireless receivers | |
JP2003507954A (en) | Interference cancellation in integrated GPS and cellular receivers | |
CA2489395A1 (en) | Filters for combined radiotelephone/gps terminals | |
JP2005519310A (en) | System and method for a GPS enabled antenna | |
Kannangara et al. | Adaptive duplexer for multiband transreceiver | |
US20090017770A1 (en) | Noise cancellation system for transceivers | |
US7356314B2 (en) | Systems and methods for reusing a low noise amplifier in a wireless communications device | |
EP2119024B1 (en) | System and method for processing a received signal | |
US6924716B2 (en) | Method and apparatus for reduction of electromagnetic feed through in a SAW filter | |
EP1293044B1 (en) | Device and method for improved filtering in a radio receiver in the microwave range | |
US9071317B2 (en) | Nullification of transmitter noise at receive signal frequency | |
US20090203341A1 (en) | Wireless receiver and wireless communication system having the same | |
KR100439227B1 (en) | RF equipment of the WLL base-station | |
WO1998011674A1 (en) | Method and apparatus for suppressing transmitter overtones and receiver blocking signals in a radio transceiver | |
KR100640322B1 (en) | Apparatus and method for exclude of echo ingredient in a wireless communication system | |
Kannangara et al. | An algorithm to use in adaptive wideband duplexer for software radio |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: SIRF TECHNOLOGY, INC., CALIFORNIA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:MCCONNELL, RICHARD J.;TSO, ROBERT;REEL/FRAME:017074/0083 Effective date: 20010802 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |
|
AS | Assignment |
Owner name: CSR TECHNOLOGY INC., CALIFORNIA Free format text: CHANGE OF NAME;ASSIGNOR:SIRF TECHNOLOGY, INC.;REEL/FRAME:027437/0324 Effective date: 20101119 |