CN115656943A - Passive radar target echo simulation system - Google Patents
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Abstract
The invention discloses a passive radar target echo simulation system, which comprises: the device comprises a radio frequency signal generator, a power dividing unit and an amplitude-phase control unit which are connected in sequence; the master control unit is respectively connected with the radio frequency signal generator and the amplitude-phase control unit; the master control unit is used for analyzing the received control command to obtain a passive radar working parameter and a target parameter and converting the passive radar working parameter and the target parameter into a first control instruction and a second control instruction; the radio frequency signal generator is used for generating a reference microwave signal according to the first control command; the power division unit is used for dividing the received reference microwave signal into N paths of microwave signals; the amplitude-phase control unit is used for receiving a second control instruction, respectively adjusting the output amplitude and the output phase of the N paths of microwave signals according to the second control instruction, and then synthesizing and outputting the N paths of microwave signals.
Description
Technical Field
The invention relates to the technical field of radar detection, in particular to a passive radar target echo simulation system.
Background
For passive radar, a radar target echo simulation system which adopts a single target model to simulate the fundamental characteristics of frequency, power and the like of an echo signal cannot meet the requirement of accurate performance test of a passive radar system. We need to consider echo simulations for multiple targets. The incoming wave direction of radar signals is one of the important characteristics for distinguishing different targets. Passive radars typically use the differences in amplitude, phase, and time response of different incoming wave signals to calculate angular information.
The existing passive radar target echo simulation system considering the multi-target model mostly adopts a Direct Digital Synthesis (DDS) mode to generate a baseband signal, and the baseband signal is played and output by a digital-to-analog converter (DAC) after time delay and convolution modulation of target characteristics and is converted into a radio frequency signal by an up-conversion circuit. In the mode, the instantaneous bandwidth of the passive radar signal is constrained by the sampling and output performance of the DAC chip, and meanwhile, the up-conversion circuit brings nonlinear distortion to the amplitude and the phase of the signal to a certain degree, so that the precision of the finally simulated multi-target echo characteristic is not high.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the defects of the prior art are overcome, the passive radar target echo simulation system is provided, and the problems that an original passive radar target echo simulation system is small in instantaneous bandwidth and low in multi-target echo characteristic simulation precision due to the influence of the sampling and output performance of a DAC chip are solved.
In order to solve the above problems, the present invention is realized by the following technical scheme:
a passive radar target echo simulation system, comprising: a radio frequency signal generator 20, a power dividing unit 30 and an amplitude and phase control unit 40 which are connected in sequence; the master control unit 10 is respectively connected with the radio frequency signal generator 20 and the amplitude and phase control unit 40; the master control unit 10 is configured to analyze the received control command to obtain a passive radar working parameter and a target parameter, and convert the passive radar working parameter and the target parameter into a first control instruction and a second control instruction; the radio frequency signal generator 20 is configured to generate a reference microwave signal according to the first control command; the power dividing unit 30 is configured to divide the received reference microwave signal into N paths of microwave signals, where N is a positive integer and N is greater than or equal to 2; the amplitude-phase control unit 40 is configured to receive the second control instruction, respectively adjust the output amplitude and the output phase of the N paths of microwave signals according to the second control instruction, and then synthesize and output the N paths of microwave signals.
Optionally, the general control unit 10 includes: the device comprises a target echo modeling module 101, an amplitude and phase calibration module 102 and a communication control module 103, wherein the communication control module 103 is respectively connected with the target echo modeling module 101, the amplitude and phase calibration module 102, the radio frequency signal generator 20 and the amplitude and phase control unit 40; the communication control module 103 is configured to receive an externally input control command, analyze the control command to obtain a passive radar working parameter and a target parameter, and transmit the passive radar working parameter and the target parameter to the target echo modeling module 101; the target echo modeling module 101 constructs target echo simulation signals under different scene models according to the working parameters and the target parameters of the passive radar, and transmits the target echo simulation signals back to the communication control module 103; the amplitude and phase calibration module 102 is configured to calibrate amplitudes and phases of the N output channels of the amplitude and phase control unit 40 at an initialization stage of the passive radar target echo simulation system, test initial amplitudes and phase differences of the N output channels at different operating frequencies in cooperation with a network analyzer, and record a calibration result; the communication control module 103 is further configured to read the calibration result and the target echo analog signal, convert the calibration result and the target echo analog signal into the first control command, send the first control command to the radio frequency signal generator 20, convert the first control command into the second control command, and send the second control command to the amplitude and phase control unit 40.
Optionally, the first control instruction includes: a pulse width changing instruction, a repetition frequency changing instruction, a power changing instruction and a signal on-off instruction; the second control instruction comprises: an N-channel amplitude change command, an N-channel phase change command.
Optionally, the radio frequency signal generator 20 sets the pulse width of the output reference microwave signal according to a pulse width change instruction; setting a pulse repetition period of the output reference microwave signal according to the repetition frequency change instruction; setting the frequency of the output reference microwave signal according to the frequency change instruction; setting the power of the output reference microwave signal according to the power change instruction; and whether a reference microwave signal is output or not is set according to the signal on-off instruction.
Optionally, the power dividing unit 30 includes: a power divider 301 and a power amplifier 302 connected to each other; the power divider 301 is configured to divide the reference microwave signal into the N paths of microwave signals; the power amplifier 302 is configured to perform power compensation on the N paths of microwave signals and then output the signals.
Optionally, the web-phase control unit 40 comprises: an amplitude-phase decoding circuit 401, N numerical control attenuators (A1 to An), N numerical control phase shifters (B1 to Bn) and a power combiner 402; the power amplifier 302 is respectively connected with the N digital controlled attenuators (A1 to An), and the N digital controlled attenuators (A1 to An) are correspondingly connected with the N digital controlled phase shifters (B1 to Bn) one by one; the N numerical control phase shifters (B1-Bn) are connected with the power combiner 402; the amplitude-phase decoding circuit 401 is configured to analyze the N-channel amplitude change instruction and the N-channel phase change instruction, acquire phase and amplitude information of the N channels of microwave signals, and convert the phase and amplitude information into an amplitude control signal and a phase control signal; the N digital control attenuators (A1-An) are used for respectively carrying out power attenuation on the N paths of microwave signals according to the amplitude control signals; the N digital phase shifters (B1-Bn) are used for shifting the phase of the N paths of microwave signals according to the phase control signals; the power combiner 402 is configured to combine the N paths of microwave signals after power attenuation and phase shift into one path of echo signal carrying multi-target information, and output the echo signal.
Optionally, the operating bandwidths of the radio frequency signal generator 20, the numerically controlled attenuators (A1 to An), and the numerically controlled phase shifters (B1 to Bn) are all greater than 10GHz.
Optionally, the general control unit 10 communicates with the radio frequency signal generator 20 and the amplitude and phase control unit 40 through network cables.
Optionally, the echo signal U carrying multi-target information R (t)：
Wherein m represents the number of targets, A i 、φ i Respectively the amplitude and relative phase of the echo of the ith target, f A Is the frequency of the target echo signal and t represents time.
Optionally, a numerical control attenuator and a numerical control phase shifter in the amplitude-phase control unit are used as a channel to generate an echo signal of a single target in a simulation manner.
The invention has one of the following advantages:
the invention provides a passive radar target echo simulation system considering a multi-target model. The working bandwidths of the radio frequency signal generator, the numerical control attenuator and the numerical control phase shifter selected in the system are all larger than 10GHz, and the system is applicable to passive radars with different working frequencies and instantaneous bandwidths and has good universality. The system provides the function of calibrating the initial amplitude and phase of each channel, and ensures the simulation precision of multi-target echoes under different working frequencies.
Drawings
Fig. 1 is a schematic block diagram of a passive radar target echo simulation system according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a hardware architecture of a passive radar target echo simulation system according to an embodiment of the present invention;
fig. 3 is a block diagram of a structure of a master control unit according to an embodiment of the present invention.
Detailed Description
The passive radar target echo simulation system provided by the invention is further described in detail below with reference to the accompanying drawings and the detailed description. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the drawings are in a very simplified form and are all drawn to a non-precise scale for the purpose of convenience and clarity only to aid in the description of the embodiments of the invention. To make the objects, features and advantages of the present invention comprehensible, reference is made to the accompanying drawings. It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the implementation conditions of the present invention, so that the present invention has no technical significance, and any structural modification, ratio relationship change or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention.
As shown in fig. 1, a passive radar target echo simulation system includes: a radio frequency signal generator 20, a power dividing unit 30 and an amplitude-phase control unit 40 which are connected in sequence; and the general control unit 10 is respectively connected with the radio frequency signal generator 20 and the amplitude and phase control unit 40.
The master control unit 10 is configured to analyze the received control command to obtain a passive radar working parameter and a target parameter. The master control unit 10 is further configured to construct a multi-target echo signal model, generate amplitude and phase information of multiple channel target echoes, and convert the passive radar working parameters, the target parameters, and the amplitude and phase information of the multiple channel target echoes into a first control instruction and a second control instruction.
Specifically, the master control unit 10 can receive an externally input control command, analyze the control command to obtain a passive radar working parameter and a target parameter, and calculate target echo simulation information according to a conventional passive radar target echo model, for example, including a conventional pulse signal model, a frequency agile signal model, an intra-pulse modulation signal model, a repetition frequency related signal, a continuous wave modulation signal model, and the like (i.e., the conventional echo model is calculated, and details are not repeated here). Then converting the target echo simulation information into different control instructions and sending the control instructions to the radio frequency signal generator and the amplitude-phase control unit, and controlling all units in the system to work cooperatively.
The radio frequency signal generator 20 is configured to generate a reference microwave signal according to the first control command; the power dividing unit 30 is configured to divide the received reference microwave signal into N paths of microwave signals, where N is a positive integer and N is greater than or equal to 2.
The amplitude-phase control unit 40 is configured to receive the second control instruction, respectively adjust the output amplitude and the output phase of the N paths of microwave signals according to the second control instruction, and then synthesize and output the N paths of microwave signals.
As shown in fig. 3, the general control unit 10 includes: the system comprises a target echo modeling module 101, an amplitude and phase calibration module 102 and a communication control module 103, wherein the communication control module 103 is respectively connected with the target echo modeling module 101, the amplitude and phase calibration module 102, the radio frequency signal generator 20 and the amplitude and phase control unit 40. The communication control module 103 is configured to receive a control command input from the outside, analyze the control command to obtain a passive radar working parameter and a target parameter, and transmit the passive radar working parameter and the target parameter to the target echo modeling module 101.
The target echo modeling module 101 constructs target echo simulation signals under different scene models according to the working parameters and target parameters of the passive radar, and returns the target echo simulation signals of multiple channels to the communication control module 103.
The amplitude and phase calibration module 102 is configured to calibrate amplitudes and phases of N output channels of the amplitude and phase control unit 40 (one numerical control attenuator and one numerical control phase shifter in the amplitude and phase control unit 40 are one channel, and in this embodiment, the N output channels) at an initialization stage of the passive radar target echo simulation system, test initial amplitudes and phase differences of the N output channels at different operating frequencies in cooperation with a network analyzer, and record a calibration result.
The communication control module 103 can read the calibration result of the amplitude and phase calibration module and the calculation result of the target echo modeling module, and then convert the calibration result into different control instructions to send to the radio frequency signal generator 20 and the amplitude and phase control unit 40. That is, the communication control module 103 is further configured to read the calibration result and the target echo analog signal, convert the calibration result and the target echo analog signal into the first control command, send the first control command to the radio frequency signal generator 20, convert the first control command into the second control command, and send the second control command to the amplitude-phase control unit 40.
In this embodiment, the first control instruction includes: a pulse width changing instruction, a repetition frequency changing instruction, a power changing instruction and a signal on-off instruction; the second control instruction comprises: an N-channel amplitude change instruction, an N-channel phase change instruction.
In this embodiment, the rf signal generator 20 adopts a standard instrument architecture to support SCPI language remote control. The radio frequency signal generator 20 is connected to the master control unit 10 through a gigabit network port, and is configured to output a reference microwave signal according to a control instruction of the master control unit 10. Specifically, the pulse width of the output reference microwave signal is set according to a pulse width change instruction; setting a pulse repetition period of the output reference microwave signal according to the repetition frequency change instruction; setting the frequency of the output reference microwave signal according to the frequency change instruction; setting the power of the output reference microwave signal according to the power change instruction; and setting whether to output a reference microwave signal according to the signal on-off instruction.
The reference microwave signal output by the rf signal generator 20 preferably has the following form:
U R (t)＝A 0 cos(2πf A t+φ 0 ) (1)
in the formula: u shape R (t) denotes a reference microwave signal, A 0 Is the reference microwave signal amplitude; f. of A Is the frequency of the reference microwave signal; phi is a unit of 0 To the initial phase, t represents time.
As shown in fig. 2, in this embodiment, the power dividing unit 30 includes: a power divider 301 and a power amplifier 302 connected to each other; the power splitter 301 is configured to split the reference microwave signal into the N paths of microwave signals; the power amplifier 302 is configured to perform power compensation on the N paths of microwave signals and output the compensated signals.
With continued reference to fig. 2, the amplitude and phase control unit 40 includes: an amplitude-phase decoding circuit 401, N numerical control attenuators (A1 to An), N numerical control phase shifters (B1 to Bn) and a power combiner 402; the power amplifier 302 is respectively connected with the N digital controlled attenuators (A1 to An), and the N digital controlled attenuators (A1 to An) are correspondingly connected with the N digital controlled phase shifters (B1 to Bn) one by one; the N number-controlled phase shifters (B1-Bn) are connected to the power combiner 402. The amplitude-phase decoding circuit 401 is respectively connected with the N digital control attenuators (A1 to An) and the N digital phase shifters (B1 to Bn).
The amplitude-phase decoding circuit 401 is configured to analyze the N-channel amplitude change instruction and the N-channel phase change instruction, acquire phase and amplitude information of the N channels of microwave signals (each channel signal), and convert the phase and amplitude information into an amplitude control signal and a phase control signal. Namely, the amplitude-phase decoding circuit 401 receives An N-channel amplitude change instruction of the master control unit 10 through the network port, converts the N-channel amplitude change instruction into An amplitude control voltage signal that can be recognized by each numerical control attenuator, and sends the amplitude control voltage signal to N numerical control attenuators (A1 to An) respectively, where N is a positive integer and N is greater than or equal to 2.
The N digital control attenuators (A1-An) are used for respectively carrying out power attenuation on the N paths of microwave signals according to the amplitude control signals. Each numerical control attenuator performs power attenuation on each path of microwave signal output by the power dividing unit 30 respectively according to the received amplitude control voltage signal, and then outputs the microwave signal to realize amplitude adjustment.
The amplitude-phase decoding circuit 401 further receives an N-channel phase change instruction of the master control unit 10 through the network port, converts the N-channel phase change instruction into phase control voltage signals which can be identified by each numerical control phase shifter, and respectively sends the phase control voltage signals to the N numerical control phase shifters (B1 to Bn); wherein N is a positive integer, and N is more than or equal to 2.
And the N digital phase shifters (B1-Bn) are used for respectively shifting the phase of the N paths of microwave signals according to the phase control signals. Namely, each numerical control phase shifter respectively adjusts the phase of each path of microwave signal output by each numerical control attenuator according to the received phase control voltage signal and then outputs the microwave signal.
The power combiner 402 is configured to combine the N paths of microwave signals after power attenuation and phase shift into one path of echo signal carrying multi-target information, and output the echo signal.
The echo signal U carrying multi-target information R (t)：
Wherein m represents the number of targets, A i 、φ i Respectively the amplitude and relative phase of the echo of the ith target, f A Is the frequency of the target echo signal and t represents time.
In this embodiment, the operating bandwidths of the rf signal generator 20, the digitally controlled attenuators (A1 to An), and the digitally controlled phase shifters (B1 to Bn) are all greater than 10GHz. The method is applicable to passive radars with different working frequencies and instantaneous bandwidths, and has good universality.
The amplitude-phase decoding circuit 401 uses a programmable logic circuit FPGA as a control chip, receives an amplitude-phase control instruction from the master control unit 10 transmitted by the network interface, obtains amplitude and phase information corresponding to N channel echo signals after analyzing and decoding the instruction according to a transmission protocol, converts the amplitude and phase information into an amplitude/phase voltage control signal, and outputs the amplitude/phase voltage control signal to each numerical control attenuator and each numerical control phase shifter through a CMOS type tri-state buffer gate circuit.
The master control unit 10 communicates with the radio frequency signal generator 20 and the amplitude and phase control unit 40 through network cables.
In this embodiment, one numerical control attenuator and one numerical control phase shifter in the amplitude-phase control unit are used as one channel, and an echo signal of a single target is generated by simulation, so that the maximum number of targets that can be simulated by the system can be increased by increasing the number of the numerical control attenuators and the number of the numerical control phase shifters.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
It should be noted that the apparatuses and methods disclosed in the embodiments herein can be implemented in other ways. The apparatus embodiments described above are merely illustrative, and for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments herein. In this regard, each block in the flowchart or block diagrams may represent a module, program or a portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems that perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, the functional modules in the embodiments herein may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be limited only by the attached claims.
Claims (10)
1. A passive radar target echo simulation system, comprising:
the radio frequency signal generator (20), the power dividing unit (30) and the amplitude and phase control unit (40) are connected in sequence;
the general control unit (10) is respectively connected with the radio frequency signal generator (20) and the amplitude and phase control unit (40);
the master control unit (10) is used for analyzing the received control command to obtain a passive radar working parameter and a target parameter, and converting the passive radar working parameter and the target parameter into a first control instruction and a second control instruction;
the radio frequency signal generator (20) is used for generating a reference microwave signal according to the first control command;
the power dividing unit (30) is used for dividing the received reference microwave signal into N paths of microwave signals, wherein N is a positive integer and is more than or equal to 2;
and the amplitude-phase control unit (40) is used for receiving the second control instruction, respectively adjusting the output amplitude and the output phase of the N paths of microwave signals according to the second control instruction, and then synthesizing the N paths of microwave signals and outputting the synthesized signals.
2. The passive radar target echo simulation system of claim 1,
the master control unit (10) comprises: a target echo modeling module (101), an amplitude and phase calibration module (102) and a communication control module (103),
the communication control module (103) is respectively connected with the target echo modeling module (101), the amplitude and phase calibration module (102), the radio frequency signal generator (20) and the amplitude and phase control unit (40);
the communication control module (103) is used for receiving an externally input control command, analyzing the control command to obtain a passive radar working parameter and a target parameter, and transmitting the passive radar working parameter and the target parameter to the target echo modeling module (101);
the target echo modeling module (101) constructs target echo simulation signals under different scene models according to the working parameters and the target parameters of the passive radar, and transmits the target echo simulation signals back to the communication control module (103);
the amplitude and phase calibration module (102) is used for calibrating the amplitudes and phases of the N output channels of the amplitude and phase control unit (40) in the initialization stage of the passive radar target echo simulation system, testing the initial amplitudes and phase differences of the N output channels under different working frequencies by matching with a network analyzer, and recording a calibration result;
the communication control module (103) is further configured to read the calibration result and the target echo analog signal, convert the calibration result and the target echo analog signal into the first control command, send the first control command to the radio frequency signal generator (20), convert the first control command into the second control command, and send the second control command to the amplitude and phase control unit (40).
3. The passive radar target echo simulation system of claim 2,
the first control instruction comprises: a pulse width changing instruction, a repetition frequency changing instruction, a power changing instruction and a signal on-off instruction;
the second control instruction comprises: an N-channel amplitude change instruction, an N-channel phase change instruction.
4. The passive radar target echo simulation system of claim 3, wherein the radio frequency signal generator (20) sets a pulse width of the output reference microwave signal according to a pulse width change command; setting a pulse repetition period of the output reference microwave signal according to the repetition frequency change instruction; setting the frequency of the output reference microwave signal according to the frequency change instruction; setting the power of the output reference microwave signal according to the power change instruction; and whether a reference microwave signal is output or not is set according to the signal on-off instruction.
5. Passive radar target echo simulation system according to claim 4,
the power dividing unit (30) includes: a power divider (301) and a power amplifier (302) connected to each other;
the power divider (301) is configured to divide the reference microwave signal into the N microwave signals;
and the power amplifier (302) is used for outputting the N paths of microwave signals after power compensation.
6. Passive radar target echo simulation system according to claim 5, characterized in that the amplitude and phase control unit (40) comprises: an amplitude-phase decoding circuit (401), N digital controlled attenuators (A1 to An), N digital controlled phase shifters (B1 to Bn) and a power combiner (402);
the power amplifier (302) is respectively connected with the N numerical control attenuators (A1 to An), and the N numerical control attenuators (A1 to An) are correspondingly connected with the N numerical control phase shifters (B1 to Bn) one by one;
the N numerical control phase shifters (B1-Bn) are connected with the power combiner (402);
the amplitude-phase decoding circuit (401) is used for analyzing the N-channel amplitude change instruction and the N-channel phase change instruction, acquiring phase and amplitude information of N paths of microwave signals, and converting the phase and amplitude information into an amplitude control signal and a phase control signal;
the N digital control attenuators (A1-An) are used for respectively carrying out power attenuation on the N paths of microwave signals according to the amplitude control signals;
the N digital phase shifters (B1-Bn) are used for respectively shifting the phase of N paths of microwave signals according to the phase control signals;
and the power synthesizer (402) is used for synthesizing one echo signal carrying multi-target information for the N paths of microwave signals after power attenuation and phase shift and outputting the echo signal.
7. Passive radar target echo simulation system according to claim 6, characterized in that the operating bandwidths of the radio-frequency signal generator (20), the digitally controlled attenuators (A1 to An) and the digitally controlled phase shifters (B1 to Bn) are each larger than 10GHz.
8. Passive radar target echo simulation system according to claim 7, characterized in that the master control unit (10) communicates with the radio frequency signal generator (20) and the amplitude and phase control unit (40) via network cables.
9. The passive radar target echo simulation system of claim 8,
the echo signal U carrying multi-target information R (t)：
Wherein m represents the number of targets, A i 、φ i Respectively the amplitude and relative phase of the echo of the ith target, f A Is the frequency of the target echo signal and t represents time.
10. The passive radar target echo simulation system of claim 9, wherein a digitally controlled attenuator plus a digitally controlled phase shifter in the amplitude and phase control unit are in a single channel, simulating the generation of an echo signal for a single target.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117420756A (en) * | 2023-10-16 | 2024-01-19 | 扬州宇安电子科技有限公司 | Airborne radar reconnaissance digital system based on sweep frequency control and automatic attenuation logic |
| CN117420756B (en) * | 2023-10-16 | 2024-05-14 | 扬州宇安电子科技股份有限公司 | Airborne radar reconnaissance digital system based on sweep frequency control and automatic attenuation logic |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117420756A (en) * | 2023-10-16 | 2024-01-19 | 扬州宇安电子科技有限公司 | Airborne radar reconnaissance digital system based on sweep frequency control and automatic attenuation logic |
| CN117420756B (en) * | 2023-10-16 | 2024-05-14 | 扬州宇安电子科技股份有限公司 | Airborne radar reconnaissance digital system based on sweep frequency control and automatic attenuation logic |
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