CN104242970B - A kind of multichannel medium-frequency pulse automatic gain attenuation control circuit - Google Patents
A kind of multichannel medium-frequency pulse automatic gain attenuation control circuit Download PDFInfo
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- CN104242970B CN104242970B CN201410430645.9A CN201410430645A CN104242970B CN 104242970 B CN104242970 B CN 104242970B CN 201410430645 A CN201410430645 A CN 201410430645A CN 104242970 B CN104242970 B CN 104242970B
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Abstract
The invention discloses a kind of multichannel medium-frequency pulse automatic gain attenuation control circuit, comprise microwave receiver, it is characterized in that, described microwave receiver output is connected with several power splitters, each power splitter is connected with detection logarithm vide o amplifier with delay line respectively, each delay line respectively in turn with the first amplifier, ATC, second amplifier is connected, several detection logarithm vide o amplifiers described are all connected with the input of same ATC control circuit, the output of described ATC control circuit is connected with the ATC of forward path respectively, each second amplifier is all connected with same intermediate-frequency receiver.Under complicated signal environment, when along with intermediate-frequency receiver apart from radiation source more and more nearer, the linear attenuation of Unified Metric can be carried out multichannel medium-frequency pulse signal, realize adjustment gain controlled quentity controlled variable at pulse front edge simultaneously, realize this pulse of this Pulse Width Control.
Description
Technical field
The present invention relates to a kind of multichannel medium-frequency pulse automatic gain attenuation control circuit.
Background technology
In the detection process of paired pulses radiation source, along with distance objective is more and more nearer, the signal strength signal intensity that receiver reception antenna receives is increasing, usually causes the ADC(A/D transducer of signal processor) overflow, and can not sample normally, that is exceed the dynamic range of system.
The method of conventional solution dynamic range has a variety of, as DLVA(detection logarithm vide o amplifier) technology, AGC(automatic growth control) technology etc., but DLVA technology linearly magnifying state when small-signal, to compress signal when large-signal, and now noise, still for small-signal is in exaggerated state, causes the signal to noise ratio of channel to change, thus the detection of impact to radiation source; AGC technology is the Linear Control of signal amplitude, but the time constant of feedback AGC technology is comparatively large, can not realize the control thought of this pulse of this Pulse Width Control, is unfavorable for applying complicated signal environment.
Summary of the invention
For the problems referred to above, the invention provides a kind of multichannel medium-frequency pulse automatic gain attenuation control circuit, under complicated signal environment, when along with intermediate-frequency receiver apart from radiation source more and more nearer, the linear attenuation of Unified Metric can be carried out to multichannel medium-frequency pulse signal, realize adjustment gain controlled quentity controlled variable at pulse front edge simultaneously, realize this pulse of this Pulse Width Control.
For realizing above-mentioned technical purpose, reach above-mentioned technique effect, the present invention is achieved through the following technical solutions:
A kind of multichannel medium-frequency pulse automatic gain attenuation control circuit, comprise microwave receiver, it is characterized in that, described microwave receiver output is connected with several power splitters, each power splitter is connected with detection logarithm vide o amplifier with delay line respectively, each delay line respectively in turn with the first amplifier, ATC, second amplifier is connected, several detection logarithm vide o amplifiers described are all connected with the input of same ATC control circuit, the output of described ATC control circuit is connected with the ATC of forward path respectively, each second amplifier is all connected with same intermediate-frequency receiver.
Wherein, preferably, described microwave receiver output is connected with five power splitters.
The signal that microwave receiver reception antenna gets off, is divided into two-way through power splitter, and amplification process is carried out through forward path in a road, and another road produces controlled quentity controlled variable through controlling brancher, to control the gain of forward path.ATC control circuit is input as the some roads video analog signal exported through power splitter and detection logarithm vide o amplifier by microwave receiver, single-chip microcomputer is sent into after the conversion of AD sample circuit, export 7bitTTL Automatic level control code, control the attenuation ratio of every road video analog signal to meet the needs of intermediate-frequency receiver.
The invention has the beneficial effects as follows: under complicated signal environment, when along with intermediate-frequency receiver apart from radiation source more and more nearer, the linear attenuation of Unified Metric can be carried out to multichannel medium-frequency pulse signal, realize adjustment gain controlled quentity controlled variable at pulse front edge simultaneously, realize this pulse of this Pulse Width Control.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of multichannel medium-frequency pulse of the present invention automatic gain attenuation control circuit;
Fig. 2 is the structural representation of ATC control circuit of the present invention.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, technical solution of the present invention is described in further detail, can better understand the present invention to make those skilled in the art and can be implemented, but illustrated embodiment is not as a limitation of the invention.
A kind of multichannel medium-frequency pulse automatic gain attenuation control circuit, as shown in Figure 1, comprises microwave receiver, described microwave receiver output is connected with several power splitters, and preferably, microwave receiver output is connected with five power splitters, conveniently understand, follow-up Jun Yi five tunnel is described.
Five power splitters are connected with detection logarithm vide o amplifier (DLVA) with delay line respectively, delay line is used for the signal of telecommunication to postpone a period of time, detection logarithm vide o amplifier is used for the dynamic range of spread signal, each delay line respectively in turn with the first amplifier, ATC(AttenuationCircuit, automatic attenuation circuit), the second amplifier be connected, in Fig. 1, amplifier act as gain compensation, the consistency of guarantee channel gain.Preferred ATC adopts ADRF6518.Several detection logarithm vide o amplifiers described are all connected with the input of same ATC control circuit.The output of described ATC control circuit is connected with the ATC of forward path respectively, and each second amplifier is all connected with same intermediate-frequency receiver.
Preferably, the structure of ATC control circuit as shown in Figure 2, comprise several inputs, in Fig. 2, have 5 tunnel analog inputs, gather the video analog signal exported by detection logarithm vide o amplifier (DLVA), because 5 tunnel analog inputs export through microwave receiver and detection logarithm vide o amplifier (DLVA), have certain direct current biasing.Each input is connected with corresponding A/D converter respectively by buffer circuit, and buffer circuit is equivalent to emitter follower, in order to increase the driving of signal.
Preferably, A/D converter is AD9238, and data export the pipelining delay having 7 clock cycle.It is useless for starting front 7 data after sampling, and need give up to fall.Described A/D converter is connected with single-chip microcomputer, and described single-chip microcomputer exports Transistor-Transistor Logic level control code by output isolation circuit.Preferably, single-chip microcomputer is sued for peace to five railway digital signals and is added up and gets the digital quantity that arithmetic mean obtains control voltage, more encoded device exports the 7bitTTL Automatic level control code of serial ports, controls the attenuation ratio of five tunnel vision signals to meet the needs of intermediate-frequency receiver.
In Fig. 2, five inputs also form circuit by stream of pulses and are connected with single-chip microcomputer, stream of pulses forms circuit in order to produce a pulse signal stream, with the intercepting window function of this stream of pulses as input clock, namely only when there being interested signal to input, system just works, and so just greatly reduces the work load of AD sample circuit.
Present invention achieves the automatic gain attenuation control circuit of this pulse of a kind of Pulse Width Control.Its essence is the one of automatic gain control circuit.Can under complicated signal environment, when along with intermediate-frequency receiver apart from radiation source more and more nearer, the linear attenuation of Unified Metric can be carried out multichannel medium-frequency pulse signal, realize adjustment gain controlled quentity controlled variable at pulse front edge simultaneously, realize this pulse of this Pulse Width Control.
These are only the preferred embodiments of the present invention; not thereby the scope of the claims of the present invention is limited; every utilize specification of the present invention and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in the technical field that other are relevant, be all in like manner included in scope of patent protection of the present invention.
Claims (5)
1. a multichannel medium-frequency pulse automatic gain attenuation control circuit, comprise microwave receiver, it is characterized in that, described microwave receiver output is connected with several power splitters, each power splitter is connected with detection logarithm vide o amplifier with delay line respectively, each delay line respectively in turn with the first amplifier, automatic attenuation circuit, second amplifier is connected, several detection logarithm vide o amplifiers described are all connected with the input of same automatic attenuation circuit control circuit, the output of described automatic attenuation circuit control circuit is connected with the automatic attenuation circuit of forward path respectively, each second amplifier is all connected with same intermediate-frequency receiver, described automatic attenuation circuit control circuit comprises several inputs, each input is connected with corresponding A/D converter respectively by buffer circuit, described A/D converter is connected with single-chip microcomputer, described single-chip microcomputer exports Transistor-Transistor Logic level control code by output isolation circuit, described microwave receiver output is connected with five power splitters.
2. a kind of multichannel medium-frequency pulse automatic gain attenuation control circuit according to claim 1, is characterized in that, several inputs described also form circuit by stream of pulses and are connected with single-chip microcomputer.
3. a kind of multichannel medium-frequency pulse automatic gain attenuation control circuit according to claim 1, it is characterized in that, described A/D converter is AD9238.
4. a kind of multichannel medium-frequency pulse automatic gain attenuation control circuit according to claim 2, is characterized in that, described stream of pulses forms circuit in order to produce a pulse signal stream and as the intercepting window function of input clock.
5. a kind of multichannel medium-frequency pulse automatic gain attenuation control circuit according to claim 1-4 any one, it is characterized in that, described automatic attenuation circuit is ADRF6518.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410430645.9A CN104242970B (en) | 2014-08-29 | 2014-08-29 | A kind of multichannel medium-frequency pulse automatic gain attenuation control circuit |
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| CN201410430645.9A CN104242970B (en) | 2014-08-29 | 2014-08-29 | A kind of multichannel medium-frequency pulse automatic gain attenuation control circuit |
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| CN104242970A CN104242970A (en) | 2014-12-24 |
| CN104242970B true CN104242970B (en) | 2016-04-06 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108111181A (en) * | 2016-11-24 | 2018-06-01 | 北京遥感设备研究所 | A kind of receiver automatic gain control circuit |
| CN109407058B (en) * | 2017-08-17 | 2023-02-28 | 北京遥感设备研究所 | Automatic gain control receiving assembly |
| CN107765101A (en) * | 2017-11-10 | 2018-03-06 | 中国科学院西安光学精密机械研究所 | A kind of multichannel high-voltage pulse monitoring device |
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| CN1072545A (en) * | 1992-09-25 | 1993-05-26 | 北京长峰声表面波公司 | Correlation processing receiver |
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