CA1182888A - Distributed beam steering computer - Google Patents

Distributed beam steering computer

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Publication number
CA1182888A
CA1182888A CA000400484A CA400484A CA1182888A CA 1182888 A CA1182888 A CA 1182888A CA 000400484 A CA000400484 A CA 000400484A CA 400484 A CA400484 A CA 400484A CA 1182888 A CA1182888 A CA 1182888A
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CA
Canada
Prior art keywords
phase shift
microcomputer
recited
array
combination
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.)
Expired
Application number
CA000400484A
Other languages
French (fr)
Inventor
George A. Works
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Raytheon Co
Original Assignee
Raytheon Co
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Filing date
Publication date
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Publication of CA1182888A publication Critical patent/CA1182888A/en
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Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/26Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture
    • H01Q3/30Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture varying the relative phase between the radiating elements of an array
    • H01Q3/34Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture varying the relative phase between the radiating elements of an array by electrical means
    • H01Q3/36Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture varying the relative phase between the radiating elements of an array by electrical means with variable phase-shifters

Abstract

DISTRIBUTED BEAM STEERING COMPUTER
Abstract A distributive beam steering computer network for a radar phased array antenna is disclosed which provides direct drive for individual antenna phase shifter elements using a plurality of microcomputers co-located with each phase shifter. The microcomputers calculate the phase shift based on constants stored in a ROM which is located in each micro-computer and phase shift data comprising sin.alpha. , sin.beta. , and 1/.lambda. signals are distributed to all microcomputers over a single serial data line. The constants required for each shifter are different, and therefore, the ROM in each micro-computer is programmed for a specific location in an array antenna. A phase shift steering command for each element of the phased array antenna is calculated using a shift-and-add multiplication algorithm which is hard-wired into each microcomputer.

Description

~ac~ground of the_Invention This invention relates to an electronically scanned phased array antenna, and more particularly to a computing element for each antenna phase shifter element.
A phased array antenna is composed of a plurality of radiating elements positioned in a spaced-apart relationship.
Such an antenna in a radar system is well adapted to electronic scanning techniques which permit a directional beam of electromagnetic energy to be moved rapidly from one direction to another by means of a plurality of phase shifter elements.
A phased array antenna may be optically fed from one or more radiant sources- Uncollimated and unsteered power from said radiant source incident upon an individual element passes through the phase shifting device and is radiated therefrom with a phase relationship determined by the setting of the individual phase shifter so as to provide the desired collimated and steered radiated phase front. Since said device is reciprocal, energy reflected from distant objects and impinging on the array in the form of substantially parallel rays will be focused by the array in a direction corresponding to the setting of the individual phase shlfter.
In the prior art, phased array radar systems have used a central beam steering computer for calculating phase shifter command signals for each phase shifter element in an array antenna. These calculations consumed considerable computer time. Typically, there are thousands of phase shifter ele-ments requiring a great number of wires to transmit the re-quired phase shift information to these elements. In ad-dition, the reliability of such sys-tems was greatly affected by a single failure in the central beam steering unit.

Another approach in the prior art of phased array antennas for generating phase shift command signals involved a matrix distribution technique. Phase shift commands are calculated in two parts wherein one part is distributed along the X direction or rows of an X-Y matrix of phase shifter elements and the other part is distributed along the Y di-rection or columns. At each phase shifter there is co-located a simple adder that adds together the X and Y phase shift command parts forming the complete phase shift command word. Collimation correction factors have to be approximated using this shift command signal approach, but this approach reduces the amount of wiring required to distribute the command signals to the phase shifter, and therefore improves the system reliability. However, this approach is limited to uniformly spaced antenna array elements in a plane.
A serial data line and a clock line in the present invention further reduces the amount of wiring required to transfer phase shifter command signals to an array antenna and other .echniques such as RF transmission may be utilized for such data and clock transfers. System reliability is Eurther improved by not having a central beam ste~ring compu-ter that can ~ail. In addition, the distributed approach de-scribed in this invention does not require the elements to be uniformly spaced or located in a plane.

~. q.~ B

Summary of the Inv _tion This invention discloses, accordiny to one broad aspect in combination: a plurality oE array elements for pro-viding a directed beam of electromagnetic energy; each of said array elements comprising a microcomputer, a phase shif-ter coupled to said microcomputer and an antenna element; a source of said electromagnetic energy; means for feeding said electro-magnetic energy to said plurality of antenna elements through the plurality of phase shifters; means for coupling common phase shift data to each microcomputer in said array elements for determining an amount of phase shift for said beam; and each microcomputer comprising means for calculati.ng said amount of phase shift for each of said antenna elements in accordance with the posltion o:E each antenna element in said array and said phase shift da-ta.
Each of the microcomputers may comprise stored data constants dependent upon the location of the mi.crocomputers in the array antenna. An input serial data line may provide a plurality of pararneters simultaneously to all distributed microcomputers for determining the amount of phase shift to be calculated.
Accordi.ng to another aspec-t o:E Ihe inventiorl, there ls provided in combination: a plurality of ar.ray elements for providing a directed beam of electromagnetic energy, each of said elements comprising a microcomputer, a phase shifter coup-led to said microcomputer, and an antenna element; means for storing in each of said microcomputers data constants used for calculating a phase shift for said directed beam, one of said constants providing phase shift compensation based on the position of said antenna element in said array of elements;
means for receiving in said microcomputer serial data words ~, for determining said phase shift, said data words being :Eed in common to each of said array el.ements; means for performing in said microcomputer addition and multiplication arithmetic operations required for calculating said phase shift; means for generating control signals in said microcomputer for estab-lishlng a sequence of control states for performing said arith-metic operations; and register means in said m:icrocomputer for storing intermediate and final phase shift calculations.
According to a fur-ther broad aspect of the invention, there is provided in combination: a phased array antenna com-prising a plurality of array elements, each of said array ele-ments comprising a microcomputer, a phase shifter coupled to said microcomputer and an antenna element coupled to said phase shifter; said microcomputer comprising arithmetic logic means for performing addition and multiplication arithmetic opera-tions for calculating a phase shift for an electromagnetic beam; multiplexer gating means for transferring data constants oE each array element and partial phase shift summations to said arithmetic logic means; read-only memory means connected to said multiplexer gating means for stori.ng said array element data constants, one of said constants providing phase sh:iE-t compensation based on tnc posi-tion of sa:id array element ln said array antenna; serial data inpu-t means connected to said multiplexer gating means for receiving data for specifying an amount of phase shift, said data being the same for each of said array elements; and register means for storing inter-mediate and final phase shift calculations connec-ted to said arithmetic logic means.
According to yet another broad aspectof the invention, there is provided an array antenna for providing a directed beam of electromagnetic energy, the direction of said beam ~; -4-,. ~ 3 ~ 3~ ~

being in accordance with abeam steering signal, said array antenna comprising: a plurality of array elements, each one ofsaid array elements comprising a computer, a phase shifter coupled to said computer and an antenna element; a source of electromagnetic energy; means for feeding said eleetromagrletie energy to the plurality of antenna elernents through the plural-ity of phase shifters; means for eoupling said beam steering signal to each eomputer in each of said plurality o-f array elements; and said computer in eaeh of said plurality of array elements eomprises means responsive to said beam steering si.gnal for determining and producing a phase shifter contro] signal for said phase shifter coupled to said computer, said phase shifter control signal being in accordance with the position of said antenrla element in said array elements and said beam steering signal.
The invention further discloses the method of calcula-ting a phase shift for an eleetromagnetie beam o:E a phased array antenna cornprising the steps of: distributing a miero-eomputer in each of a plurality of array elements in sald anten-na, said microeomputer being coupled to a phase shifter; per-forming addition and multiplication ari-thmetic operati.ons Eor determining said phase shi:E-t by using arithmeti.c logic means in said mierocomputer; trans:Eerring da-ta constants and parti.al phase shift summations for each oE said array elements to said arithmetic logic means by a multiplexer gating means in said mieroeomputer; storing sai.d data constan-ts for each of said array elernents in a read-only memory means in said microcom-puter; compensating each phase shift calculation using at leas-t one of said stored data eonstants to account for posi-tional difference of eaeh array element in said antenna; calculating said phase shift from input serial data received by said micro-~ -4a-.~

computer, said data being common to each of said array elements, and from at least one of said data constants stored in each microcomputer; and storing intermediate and final phase shift calculations by register means in said microcomputer.
In a preferred embodiment, the step of storing the data constants comprises at least three data words in the read-only memory, the step of calculating the amount of phase shift from the input serial data comprises at least three phase shift parameter data words, with a sum control bit means between the second and third phase shift parameter data words and the input serial data words enter each microcomputer with a least significant bit first and a most significant bit last to facili-tate the addition and multiplication operations.

-4b-Brief Description of t.he Drawings Other and further features and advantages of the in-v-ention will become apparent in connection with the accompanying drawings wherein:
FIG. 1 is a simplified block diagram of a phased array radar system embodying the distributed beam steering micro-computer invention at each phase shifter element of a phased array antenna;
FIG. 2 is a block diagram of the distributed beam steering microcomputer invention; and FIG. 3 is a timing diagram for the distributed beam steering microcomputer invention showing the control signals relative to three phase shift parameter serial data words comprising sin a , sin ~ and 1/~ .

Description of the Preferred Embodiment Referring now to FIG. 1 there is shown a phased array antenna subsystem 25 comprised of a plurality of elements each element comprising a distributed beam steering micro-computer 22~, a phase shifter 24A and an antenna 26A. The microcomputer in this invention comprises a semiconductor integrated circuit or a plurality of integrated circuits that calculate the phase shift for an array antenna utilizing a hard-wired shift-and-add algorithm. Electromagnetic energy is propagated from a feed system 14 to a phase shifter element
2~A which determines the direction of the energy beam 28 emitted from the antenna subsystem. Beam steering is accomplished by calculating the amount of phase shift to be applied to the radiant energy from the feed system 14.
A source of electromagnetic energy is provided by a transmitter 10 and a duplexer 12 controls the energy being transmitted and received by the array antenna 25. A radar return signal is sent to a receiver 16 and an electronic unit 13 provides timing and control signals for the complete radar system. A control computer 20 per~orms the data pro-cessing of the radar data and provides phase shift parameter data words to all the distributed beam steering microcomputers 22 over serial data line 21.
The phase shift calculation for each phase shifter is performed in a distributed beam steering microcomputer 22 co-located with each phase shifter 24A. Serial data 21 is simultaneously sent to all distributed beam steering micro-computers 22 specifying the amount of phase shift to be cal-culated by each microcomputer. As shown in FIG. 2, stored in a read-only memory, ROM 40, of each microcomputer are three data constants Cl, C2, and C3. These constants which are different for each phased array antenna element location are used to calculate the phase shift for each antenna element, one of which is designated 26A in FIG. 1, so that the radiated energy 27 will have the desired beam direction 28.
FIG. 2 is a block diagram of a distributed beam steering microcomputer. A ROM 40 stores three constants Cl, C2, and C3 in three memory locations 41, 43, and 45. A multiplexer 42 selects which one of four inputs 78, 80, 82, and 84 will be transferred to AND gate 44. This selection is determined by the two control lines control A 66 and control B 68 which are generated b~ the control counter and decode 50. Control C 70 determines whether shifter 54 does a left shift by n bits or a right shift by one bit and control D 72 clocks data into register X 48 (via OR gate 56) and register Y 58. The input serial data 62 comprises three phase shift parameter data words sin ~ 34, sin ~ 36, and 1/ ~ 38 along with a sum control bit 32 between sin ~ 36 and 1/~ 38 data words as shown in FIG. 3 for every phase shift calculation. The number of bits in each one of said phase shift parameter data words is de-termined by the number of elements in an arrcly antenna, the spacing between the elements and the number of bits of re-sults required to control a phase shifter, all of ~lhich are readily determined by one of ordinary skill in the art. The combination of AND gate 44, adder 46 and shifter 54 provide a multiplication arithmetic operation capability. Register X
48 and register Y 58 store intermediate phase shift calculation results and register Z 60 stores the final phase shift command word 76. The clock 64 provides timing for the operation of the distributed beam steering microcomputer and the one shot 52 provides an end 74 signal which indicates the end of a phase shift calculation causing the final phase shift command word 76 to be stored in register 2 60.
The calculation performed by each distributed beam steering microcomputer solves the equation:
~ (Clsin~+ C2sin~ + C3) In this equation, ~ is the amount of phase shift per array element required to achieve a certain overall beam direction 28 as illustrated in FIG. 1. The computed result of the phase shift command word comprises an integer part plus a fractional part. Only the fractional part, or least significant bi.s, are needed to control the phase shifter in a phase steered antenna. In a time-delay steered antenna, the complete phase shift command word would be used. Constants Cl and C2 provide X and Y coordinate information for each element in an array antenna required to point the beam direction 28 in a specific direct:ion. Constant C3 provides compensation for differences in electrical distances from the feed system 14 to the var ous array antenna elements required for focusing the beam. Alpha ~a ) represents the elevation angle and beta (~ ) represents the azimuth angle; lambda(~ represents the wavelength o the transmitted beam. A set of constants Cl, C2, and C3 are different for each element of an array antenna which also provides an inherent self-test capability oE each element by utilizing these constants to address an element. Sin~ , sin ~ and 1/~ phase shift parameters are simultaneously sent to all array elements for determining a specific amount of phase shift or beam direction. Therefore, the constants are stored in each distributed beam steering microcomputer and the phase shift parameters are received via serial data line 62 as shown in FIG. 2. The sequence of arrival of the phase shift serial data value 61 into the microcomputer is shown in FIG. 3. The reciprocal of ~ or 1/~ is sent to the distributed beam steering microcomputer so that a multiplication is performed instead of a division when calculating the phase shift, ~.
Referring now to FIG. 2, at the start of a phase shift calculation the control counter and decode 50 and register X 48 are cleared by the clock 64. As the sin a datd word arrives, with the least significant bit (LSs) first, the constant Cl is multiplied by sin Q using a standard shift-and-add algorithm known to one skilled in the art. The control for this algorithm is performed b~ the control counter and decode 50. During the multiplication process of shifts-and-adds the partial product is temporarily stored in register X 48 and it is shifted one bit to the right in shifter 54 before each addition performed by the adder 4~; however, the addition is inhibited whenever a zero bit occurs in the data word. When the most significant bit (MSB) of s:in Q iS received and processed, register X 48 contains the product Clsin Q . When the LSB of sin ~ enters the microcomputer, the contents of register X 48 are shifted n places to the left where n represents the maximum number of bits in the sin Q data word. The computer then proceeds to multiply C2 by sin ~ using the same shift-and-add algorithm as before. As the sin ~ data word enters the computer, one bit per clock pulse, and the multiplication operation begins~ each partial product is added to Clsin a as a result of the n bit shift left in register X 48 prior to the start oE this multi-plication process. When the MSB of sin ~ is received and processed, register X 48 contains the partial sum Clsin ~ + C2sin,B .

The next bit received by ~he distributed beam steering microcomputer on the serial data line 62 after the sin ~ data word is a sum control bit 32. This control bit must be a logic 1 to permit the constant C3 to be added to the partial sum Clsin ~ + C2sin ~ after said partial sum is transferred to the adder 46 from register X 48. The new sum Clsin ~ +
C2sin ~ ~ C3 is clocked into register Y 58 by -the control D 72 signal.
One more multiplication process occurs when the first bit of the 1/ A serial data word enters the microcomputer.
The new sum now stored in register Y 58 is multiplied by the 1/~ data word using the same shift-and-add algorithm as for ~he previous m~lltiplications. This causes the sum Clsin Q +
C2sin ~ + C3 to be transferred from register Y 58 via multiplexer 42 to AND gate 44 during each partial product operation. At the conclusion of this multiplication process the product, ~ (Clsin Q + C2sin ~ + C3) is transferred to register Z 60 by the end 74 signal as shown in FIG. 2 and FIG. 3 and the phase shift command word 76 is now available for controlling the phase shifter element 24~ shown in FIG. 1.
This concludes the description of the preferred embodi-ment. However, many modifications and alterations will be obvious to one of ordinary skill in the art without departing from the spirit and scope of the inventive concept. Therefore, it is intended that the scope of this invention be limited only by the appended claims.

Claims (31)

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. In combination: a plurality of array elements for providing a directed beam of electromagnetic energy; each of said array elements com-prising a microcomputer, a phase shifter coupled to said microcomputer and an antenna element; a source of said electromagnetic energy; means for feeding said electromagnetic energy to said plurality of antenna elements through the plurality of phase shifters; means for coupling common phase shift data to each microcomputer in said array elements for determining an amount of phase shift for said beam; and each microcomputer comprising means for calculating said amount of phase shift for each of said antenna elements in accordance with the position of each antenna element in said array and said phase shift data.
2. The combination as recited in claim 1 wherein: each of said microcomputers comprises stored data constants dependent upon the location of said microcomputers in said array.
3. The combination as recited in claim 2 wherein: said stored data comprises at least three constants for providing element location correction data.
4. The combination as recited in claim 1 wherein: said coupling means for determining an amount of phase shift comprises a serial data line.
5. The combination as recited in claim 4 wherein: said serial data line provides a plurality of common parameters simultaneously to each microcomputer of said array elements for determining said amount of phase shift.
6. In combination: a plurality of array elements for providing a directed beam of electromagnetic energy, each of said elements comprising a microcomputer, a phase shifter coupled to said microcomputer, and an antenna element; means for storing in each of said microcomputers data constants used for calculating a phase shift for said directed beam, one of said constants providing phase shift compensation based on the position of said antenna element in said array of elements; means for receiving in said microcomputer serial data words for determining said phase shift, said data words being fed in common to each of said array elements; means for performing in said microcomputer addition and multiplication arithmetic operations required for calculating said phase shift; means for generating control signals in said microcomputer for establishing a sequence of con-trol states for performing said arithmetic operations; and register means in said microcomputer for storing intermediate and final phase shift cal-culations.
7. The combination as recited in claim 6 wherein: at least three of said constants are stored in read-only memory for providing phase shift position compensation for each antenna element and a self-test capability for each of said array elements.
8. The combination as recited in claim 6 wherein: said receiving means comprises a gate means for transferring serial data words to an Adder depending on the bit pattern of said serial data words.
9. The combination as recited in claim 8 wherein: said serial data words provide a plurality of common parameters simultaneously to each microcomputer of said array elements for determining said phase shift.
10. The combination as recited in claim 9 wherein: each of said serial data words enters said microcomputer with a least significant bit first and a most significant bit last to facilitate operation of a shift-and-add algorithm.
11. The combination as recited in claim 6 wherein: said arithmetic operation means comprises a shifter and an adder.
12. The combination as recited in claim 6 wherein: said register means comprises at least three registers.
13. In combination: a phased array antenna comprising a plurality of array elements, each of said array elements comprising a microcomputer, a phase shifter coupled to said microcomputer and an antenna element coupled to said phase shifter; said microcomputer comprising arithmetic logic means for performing addition and multiplication arithmetic operations for cal-culating a phase shift for an electromagnetic beam; multiplexer gating means for transferring data constants of each array element and partial phase shift summations to said arithmetic logic means; read-only memory means connected to said multiplexer gating means for storing said array element data constants, one of said constants providing phase shift com-pensation based on the position of said array element in said array antenna;
serial data input means connected to said multiplexer gating means for receiving data for specifying an amount of phase shift, said data being the same for each of said array elements; and register means for storing intermediate and final phase shift calculations connected to said arithmetic logic means.
14. The combination as recited in claim 13 wherein: at least three of said data constants are stored in said read-only memory means for pro-viding phase shift position compensation for each antenna element and a self-test capability for each of said array elements.
15. The combination as recited in claim 13 wherein: said input serial data means receives at least three phase shift data words for specifying said phase shift.
16. The combination as recited in claim 15 wherein: input serial data received by said serial data means comprises a sum control bit means be-tween said second and third phase shift data words.
17. The combination as recited in claim 15 wherein: each of said phase shift data words enters said microcomputer with a least significant bit first and a most significant bit last to facilitate operation of a shift-and-add algorithm.
18. The combination as recited in claim 13 wherein: said arithmetic logic means comprises a shifter, an adder and control means.
19. The combination as recited in claim 13 wherein: said register means comprises a first register means, for accumulating partial products during a multiplication operation, connected to said arithmetic logic means.
20. The combination as recited in claim 19 wherein: said register means further comprises a second register means, for storing a summation of phase shift parameters, connected to said multiplexer gating means.
21. The combination as recited in claim 20 wherein: said register means further comprises a third register means, for storing a final com-puted phase shift prior to transfer to a phase shifter element, connected to said arithmetic logic means.
22, The combination as recited in claim 21 wherein: a timing means generates a signal for storing said final computed phase shift in said third register means.
23. The method of calculating a phase shift for an electromagnetic beam of a phased array antenna comprising the steps of: distributing a microcomputer in each of a plurality of array elements in said antenna, said microcomputer being coupled to a phase shifter; performing addition and multiplication arithmetic operations for determining said phase shift by using arithmetic logic means in said microcomputer; transferring data constants and partial phase shift summations for each of said array elements to said arithmetic logic means by a multiplexer gating means in said micro-computer; storing said data constants for each of said array elements in a read-only memory means in said microcomputer; compensating each phase shift calculation using at least one of said stored data constants to account for positional difference of each array element in said antenna;
calculating said phase shift from input serial data received by said microcomputer, said data being common to each of said array elements, and from at least one of said data constants stored in each microcomputer; and storing intermediate and final phase shift calculations by register means in said microcomputer.
24. The method as recited in claim 23 wherein: the step of storing said data constants comprises at least three data words in said read-only memory for providing element location correction data and a self-test capability for each array element.
25. The method as recited in claim 23 wherein: the step of calcula-ting the amount of phase shift from said input serial data comprises at least three phase shift data words received simultaneously by each of said array elements.
26. The method as recited in claim 25 wherein: said input serial data comprises a sum control bit means between said second and third phase shift data words.
27. The method as recited in claim 25 wherein: each of said phase shift data words enters said microcomputer with a least significant bit first and a most significant bit last to facilitate said addition and multiplication operations.
28. The method as recited in claim 23 wherein: the step of storing intermediate and final phase shift calculations further comprises accumu-lating partial products in a first register means during a multiplication operation.
29. The method as recited in claim 28 wherein said register means further comprises a second register means for storing a summation of phase shift parameters.
30. The method as recited in claim 29 wherein: said register means further comprises a third register means for storing a final computed phase shift word prior to transfer to a phase shifter element.
31. An array antenna for providing a directed beam of electromagnetic energy, the direction of said beam being in accordance with a beam steering signal, said array antenna comprising: a plurality of array elements, each one of said array elements comprising a computer, a phase shifter coupled to said computer and an antenna element; a source of electromagnetic energy;
means for feeding said electromagnetic energy to the plurality of antenna elements through the plurality of phase shifters; means for coupling said beam steering signal to each computer in each of said plurality of array elements; and said computer in each of said plurality of array elements comprises means responsive to said beam steering signal for determining and producing a phase shifter control signal for said phase shifter coupled to said computer, said phase shifter control signal being in accor-dance with the position of said antenna element in said array elements and said beam steering signal.
CA000400484A 1981-04-30 1982-04-05 Distributed beam steering computer Expired CA1182888A (en)

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US259,291 1981-04-30
US06/259,291 US4445119A (en) 1981-04-30 1981-04-30 Distributed beam steering computer

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Families Citing this family (40)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58186810A (en) * 1982-04-26 1983-10-31 Nec Corp Device for determining for space craft velocity
SE456536B (en) * 1985-03-08 1988-10-10 Ericsson Telefon Ab L M TESTING DEVICE IN A RADAR SYSTEM WITH AN ELECTRICALLY ACID ANTENNA
CA1232059A (en) * 1985-03-21 1988-01-26 Donald C. Knudsen Digital delay generator for sonar and radar beam formers
US6275679B1 (en) * 1985-06-24 2001-08-14 The United States Of America As Represented By The Secretary Of The Air Force Secure communication using array transmitter
US4720712A (en) * 1985-08-12 1988-01-19 Raytheon Company Adaptive beam forming apparatus
US4670756A (en) * 1986-04-07 1987-06-02 Hazeltine Corporation Phase shifter control
US4724441A (en) * 1986-05-23 1988-02-09 Ball Corporation Transmit/receive module for phased array antenna system
US4724440A (en) * 1986-05-30 1988-02-09 Hazeltine Corporation Beam steering unit real time angular monitor
IT1205769B (en) * 1987-03-26 1989-03-31 Selenia Spazio Spa RADAR SYSTEM CONSTITUTED BY A SERIES OF INTERCONNECTED ELEMENTARY SATELLITES
US5008680A (en) * 1988-04-29 1991-04-16 The United States Of America As Represented By The Secretary Of The Navy Programmable beam transform and beam steering control system for a phased array radar antenna
JPH0265401A (en) * 1988-08-31 1990-03-06 Mitsubishi Electric Corp Data transfer equipment for antenna control
US5027126A (en) * 1989-05-17 1991-06-25 Raytheon Company Beam steering module
US4980691A (en) * 1989-05-18 1990-12-25 Electromagnetic Sciences, Inc. Distributed planar array beam steering control with aircraft roll compensation
JPH07112126B2 (en) * 1989-06-07 1995-11-29 三菱電機株式会社 Data transfer device for antenna control
US5003314A (en) * 1989-07-24 1991-03-26 Cubic Defense Systems, Inc. Digitally synthesized phase error correcting system
US5083131A (en) * 1990-05-31 1992-01-21 Hughes Aircraft Company Local compensation of failed elements of an active antenna array
US5103232A (en) * 1991-04-18 1992-04-07 Raytheon Company Phase quantization error decorrelator for phased array antenna
US5130717A (en) * 1991-04-29 1992-07-14 Loral Defense Systems Antenna having elements with programmable digitally generated time delays
US5339086A (en) * 1993-02-22 1994-08-16 General Electric Co. Phased array antenna with distributed beam steering
US5353031A (en) * 1993-07-23 1994-10-04 Itt Corporation Integrated module controller
JP2610779B2 (en) * 1994-02-23 1997-05-14 株式会社エイ・ティ・アール光電波通信研究所 Received signal processing device for array antenna
US6043779A (en) * 1999-03-11 2000-03-28 Ball Aerospace & Technologies Corp. Antenna apparatus with feed elements used to form multiple beams
CN100409486C (en) * 2000-07-10 2008-08-06 安德鲁公司 Cellular antenna
US7639196B2 (en) * 2001-07-10 2009-12-29 Andrew Llc Cellular antenna and systems and methods therefor
US6606056B2 (en) 2001-11-19 2003-08-12 The Boeing Company Beam steering controller for a curved surface phased array antenna
US8018390B2 (en) * 2003-06-16 2011-09-13 Andrew Llc Cellular antenna and systems and methods therefor
US7427962B2 (en) * 2003-06-16 2008-09-23 Andrew Corporation Base station antenna rotation mechanism
US7436370B2 (en) * 2005-10-14 2008-10-14 L-3 Communications Titan Corporation Device and method for polarization control for a phased array antenna
US20090061941A1 (en) * 2006-03-17 2009-03-05 Steve Clark Telecommunications antenna monitoring system
WO2008104456A1 (en) * 2007-02-28 2008-09-04 Selex Sensors & Airborne Systems Limited End- fed array antenna
WO2008154458A1 (en) * 2007-06-07 2008-12-18 Raytheon Company Methods and apparatus for phased array
US7978123B2 (en) * 2009-05-04 2011-07-12 Raytheon Company System and method for operating a radar system in a continuous wave mode for data communication
US9297896B1 (en) * 2011-05-24 2016-03-29 Garmin International, Inc. Electronically steered weather radar
US9276315B2 (en) 2012-01-13 2016-03-01 Raytheon Company Memory based electronically scanned array antenna control
US9026161B2 (en) 2012-04-19 2015-05-05 Raytheon Company Phased array antenna having assignment based control and related techniques
CN102738583B (en) * 2012-06-06 2014-04-09 北京航空航天大学 Phased-array antenna beam control system based on distribution-centralization type beam control mode
CN102968095B (en) * 2012-09-11 2015-05-20 上海航天测控通信研究所 Distributed beam control device supporting remote loading
US20160164174A1 (en) * 2014-12-05 2016-06-09 Raytheon Company Phased array steering
US10122426B2 (en) * 2015-07-20 2018-11-06 Centre Of Excellence In Wireless Technology Method for beam steering in multiple-input multiple-output system
US20230074075A1 (en) * 2021-09-08 2023-03-09 MeshPlusPlus, Inc. Phased-array antenna with precise electrical steering for mesh network applications

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3305867A (en) * 1963-11-05 1967-02-21 Raytheon Co Antenna array system
US3560985A (en) * 1967-08-04 1971-02-02 Itt Compact steerable antenna array
DE1926498A1 (en) * 1969-05-23 1970-11-26 Siemens Ag Method for the automatic tracking of the directional beam of a phased array antenna
US3680109A (en) * 1970-08-20 1972-07-25 Raytheon Co Phased array
US3745580A (en) * 1971-04-26 1973-07-10 Litton Systems Inc Digital beam displacement circuit
US3697994A (en) * 1971-07-19 1972-10-10 Us Navy Automatic beam steering technique for cylindrical-array radar antennas
US3775769A (en) * 1971-10-04 1973-11-27 Raytheon Co Phased array system
GB1505535A (en) * 1974-10-30 1978-03-30 Motorola Inc Microprocessor system

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