WO2022170665A1

WO2022170665A1 - Radar signal waveform uncertainty test system

Info

Publication number: WO2022170665A1
Application number: PCT/CN2021/082387
Authority: WO
Inventors: 曾小东; 高鹏程; 田晓; 王立; 乔文昇
Original assignee: 西南电子技术研究所（中国电子科技集团公司第十研究所）
Priority date: 2021-02-10
Filing date: 2021-03-23
Publication date: 2022-08-18
Also published as: CN112965037B; CN112965037A

Abstract

A radar signal waveform uncertainty test system, which comprises: during measurement, a radar excitation signal sent by a radar end machine is split into three paths via a power divider, the radar excitation signal on the first path produces a radar echo signal via a radar target simulator, and same is input into a reception terminal of the radar end machine; the radar excitation signal on the second path is delivered to a wide band collection, storage, and analysis device via a radio frequency cable, the wide band collection, storage, and analysis device measures the radar signal in real time, generates time, frequency, and modulation measurement data, and transmits same to a data analysis computer; and the radar excitation signal on the third path is radiated out by means of a radar antenna, an electronic reconnaissance device measures the power of a signal that arrived, generates power measurement data of the radar signal, and transmits same to the data analysis computer. Waveform uncertainty calculation software in the data analysis computer tabulates measured value change quantities in each dimension and calculates a waveform uncertainty of the radar signal. Test time for radar signal waveform uncertainty is short, and the present invention has a high degree of automation.

Description

Radar Signal Waveform Uncertainty Test System

This application claims the priority of the Chinese patent application filed on February 10, 2021 with the application number 202110183698.5 and the invention title "Testing System for Uncertainty of Radar Signal Waveform", the entire contents of which are incorporated into this application by reference middle.

technical field

The invention relates to a test system for radar signal waveform uncertainty, which is used for evaluating the low interception performance of a radar system.

Background technique

With the development of radar technology, the form of radar signals is becoming more and more complex, and waveform testing of radar signals has always been the key technology and difficulty in radar testing. The intrapulse characteristics of the radar signal are an important manifestation of the subtle characteristics of the radar signal, which are mainly manifested in various modulations within the pulse. The detailed information of the waveform uncertainty and irregularity of the radar signal embodies the differences of different modulation methods. Waveform uncertainty refers to the collection of multi-dimensional radiation parameters of radar signals in the time domain, frequency domain, modulation domain, power domain, etc. It is one of the main technical indicators to evaluate the low interception performance of radar signals. The higher the waveform uncertainty of radar signals , the lower the probability of being intercepted by reconnaissance equipment, the better the low interception performance. In the radar waveform design stage, it is mainly implemented in the time domain, frequency domain, modulation domain and power domain. In the time domain, the waveform uncertainty of radar signals is mainly reflected in the pulse level. The pulse shapes of radar signals are various, including rectangular pulses, half-sine pulses, cosine square pulses, Gaussian pulses, etc. The spectrum corresponding to different pulse shapes Different; the pulse width of the radar signal will be designed according to the requirements of the distance resolution and the improvement factor of the moving target indication system; the pulse repetition period of the radar signal will choose different types of changes according to the requirements of use, and the common types of changes are fixed, Swing, stagger and pulse groups and more. In the frequency domain, the waveform uncertainty of the radar signal is mainly reflected in the frequency agility. The frequency agile radar can switch the encoding method randomly, which makes it difficult for the reconnaissance party to predict the next radar pulse frequency based on the received radar pulse frequency value. Therefore, it is difficult to guide the jammer to implement frequency targeting jamming, that is to say, the frequency agile radar has strong anti-interception and anti-jamming characteristics. In the modulation domain, radar signals generally use pulse compression technology to achieve a large time-bandwidth product, thereby achieving low interception characteristics of the signal. Because the single filter bandwidth in the comb filter bank of the channelized interception receiver cannot be made very wide, the effective means to combat the channelized interception receiver is to use a wideband waveform. The common low intercepted signal type is a chirp signal. , phase coded signal and phase shift keying/frequency shift keying mixed coded signal, etc. In the power domain, the radar signal adopts the power control method to reduce the radiation energy of the radar antenna and realize the low interception characteristic of the signal.

It is very necessary to study the waveform uncertainty of radar signals. Due to the particularity of the profession, the testing method of radar signal waveform uncertainty is rarely reported abroad. Only a few units in China have conducted research. Northwestern Polytechnical University uses pulse sorting to evaluate the waveform uncertainty of radar, and sets the waveform uncertainty of conventional radar signals as the benchmark. According to the three indicators of recognition degree and sorting accuracy, the waveform uncertainty of various radar signals is obtained. In practical applications, it is more common to test and verify the changes in the four dimensions of the signal in the time domain, frequency domain, modulation domain and power domain. The set of changes in the four dimensions is the waveform uncertainty of the radar signal. . This definition and test method are generally recognized in the industry, but tests of different dimensions need to be configured with different test instruments and completed in different scenarios. In the time domain, an oscilloscope is used to measure the pulse width and pulse repetition period of the signal. The features extracted in the time domain are easily affected by changes in the carrier frequency. Although the time domain algorithm is used, the processing speed is faster and the detection performance is higher Probabilistic and parametric measurement accuracy, but susceptible to noise, resulting in larger errors at lower signal-to-noise ratios. In the frequency domain, a spectrum analyzer is required to measure the signal frequency. In the modulation domain, a modulation analyzer is used to measure parameters such as the modulation bandwidth of the signal. In the power domain, a power meter is used to measure and analyze the power variation of the signal. Finally, data processing is performed on the test results of the four dimensions, and the waveform uncertainty of the radar signal to be measured is obtained by further calculation.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a radar signal waveform uncertainty test system with simple hardware structure, short test time, high degree of automation, high detection probability and real scene, aiming at the problems existing in the prior art.

The above-mentioned purpose of the present invention can be achieved through the following technical solutions: a radar signal waveform uncertainty test system, which connects the electronic reconnaissance equipment and the broadband acquisition, storage and analysis equipment of the data analysis computer through a network cable, and connects the electronic reconnaissance equipment through a radio frequency cable. The reconnaissance antenna, and the time system equipment connecting the electronic reconnaissance equipment, the broadband acquisition, storage and analysis equipment and the radar terminal to be measured through a low-frequency cable, including: during the measurement process, the radar excitation emitted by the radar terminal The signal is divided into 3 channels by the power divider. Among them, the first radar excitation signal is connected to the radar target simulator through the radio frequency cable. The radar target simulator generates the radar echo signal according to the set parameters, and the radar echo signal passes through the radio frequency The cable is input to the receiving end of the radar terminal; the second radar excitation signal is sent to the broadband acquisition, storage and analysis device through the radio frequency cable, and the broadband acquisition, storage and analysis device collects and stores the second radar excitation signal, and measures in real time. The pulse width, pulse repetition period, working frequency and modulation bandwidth of the radar signal are processed by bandwidth normalization, and the measurement data of the broadband acquisition, storage and analysis equipment is transmitted to the data analysis computer through the network cable; the third radar excitation signal is sent through the radio frequency cable. The electronic reconnaissance device detects the radar radiation signal through the connected reconnaissance antenna, measures the power of the arriving signal, generates the power measurement data of the radar signal, and transmits the power measurement data through the network cable. To the data analysis computer; the waveform uncertainty calculation software in the data analysis computer collects and stores the pulse width, pulse repetition period, operating frequency, modulation bandwidth measurement data of the radar signal generated by the broadband acquisition and analysis equipment and the radar signal generated by the electronic reconnaissance equipment. The power measurement data is processed, the number of changes of the measurement values in each dimension is counted, and the radar signal waveform uncertainty within the transmission time of the radar terminal is calculated.

Further, the radar signal waveform uncertainty test system also includes: setting the task type of the radar system through the radar display and control computer, and controlling the radar terminal computer to generate a radar signal with a specified waveform uncertainty measurement value and a device for transmitting an excitation signal. start and stop times.

Further, during the measurement process, the time system equipment generates a B code signal, and sends the B code signal to the radar terminal, the broadband acquisition, storage and analysis equipment and the electronic reconnaissance equipment through a low-frequency cable. The radar terminal, the broadband acquisition, storage and analysis equipment, the electronic reconnaissance equipment and the test system provide a unified time reference to maintain a high degree of unification of the time between the test object and the test system, and to ensure high-precision synchronous operation of various equipment.

Further, the radar signal waveform uncertainty test system further includes: using the radar target simulator to collect the radar transmit signal, simulating the radar target echo signal characteristics according to the radar terminal transmit waveform, and the output signal is used for Injection testing of radar mission performance.

Further, the radar signal waveform uncertainty testing system further includes: receiving the radar echo signal through the radar terminal, and calculating the distance and speed parameters of the target based on the radar echo signal, so as to realize the preset setting of the radar system. The task performance of distance measurement accuracy and speed measurement accuracy.

Further, the radar signal waveform uncertainty test system also includes: using the broadband acquisition, storage and analysis equipment to collect the radar excitation signal under wired conditions, and to measure the time domain, frequency domain, and modulation domain parameters of the radar excitation signal. .

Further, the radar signal waveform uncertainty test system further includes: using the broadband acquisition, storage and analysis equipment to receive the radar excitation signal, and after frequency conversion, amplification and filtering of the radar excitation signal, an intermediate frequency signal is generated, and the intermediate frequency signal is simulated. The front-end of the digital converter (ADC) performs short-time Fourier transform (STFT) after sampling, transforms the signal into the time-frequency domain for analysis and processing, and performs preliminary detection and screening of the pulse signal through the set signal threshold to generate a width-preserving pulse. ;Use field programmable gate array (FPGA) counter to count the pulse rising edge and falling edge of the width-preserving pulse, and obtain the pulse arrival time, pulse width and pulse repetition period; perform phase difference frequency measurement on the signal after STFT to get the work. frequency; analyze the intra-pulse and inter-pulse characteristics to obtain the modulation bandwidth; save the measured pulse width, pulse repetition period, operating frequency, and modulation bandwidth as a pulse description word (PDW) data file and store it in the disk array.

Further, the radar signal waveform uncertainty test system also includes: the electronic reconnaissance device collects the radar radiation signal under wireless conditions through the reconnaissance antenna, and measures the power domain of the radar radiation signal, and the power of the radar signal is measured. The measured value P _t is obtained by further calculating the signal power reaching the electronic reconnaissance equipment:

Among them, S _E is the signal power reaching the electronic reconnaissance equipment, R _E is the distance from the radar antenna to the reconnaissance antenna, L _E is the receiving loss of the electronic reconnaissance equipment, G _E is the gain of the reconnaissance antenna to the direction of the radar antenna, and λ is the signal wavelength .

Further, the radar signal waveform uncertainty test system also includes: the data analysis computer is provided with radar signal waveform uncertainty calculation software, and the time domain and frequency of the radar signal sent by the broadband acquisition and storage analysis equipment and the electronic reconnaissance equipment are analyzed. For the measurement parameters in the domain, modulation domain and power domain, after data elimination and data classification processing are performed in their respective dimensions, the number of measured value changes in each dimension is counted. According to the radar signal waveform uncertainty = the number of changes in the time domain × the number of changes in the frequency domain The formula for calculating the number of changes in the modulation domain × the number of changes in the power domain calculates the waveform uncertainty of the radar signal.

Further, the radar signal waveform uncertainty test system also includes: on the radar display and control computer, the radar terminal computer is controlled to start radiation according to the configured waveform parameters, and the broadband acquisition, storage and analysis equipment and the electronic reconnaissance equipment perform signal acquisition. , to measure the parameters of the radar signal in the time domain, frequency domain, modulation domain and power domain.

Compared with the prior art, the present invention has the following beneficial effects:

The hardware structure is simple. The invention includes an electronic reconnaissance device and a broadband acquisition, storage and analysis device connected to a data analysis computer through a network cable, a reconnaissance antenna connected to the electronic reconnaissance device through a radio frequency cable, and the electronic reconnaissance device, the broadband acquisition, storage and analysis device and the radar end to be tested are connected through a low-frequency cable. It has the characteristics of fast working speed, high resource utilization rate and simple hardware structure.

Test time is short. The invention adopts the radar excitation signal emitted by the radar terminal machine to be divided into 3 channels by a power divider. The radar target simulator of the first channel of radar excitation signal is connected by a radio frequency cable, and the radar echo signal is generated according to the set parameters. The radio frequency cable is input to the receiving end of the radar terminal; the second radar excitation signal is sent to the broadband acquisition, storage and analysis equipment through the radio frequency cable. , working frequency, modulation bandwidth for real-time measurement and bandwidth normalization processing, the bandwidth normalization processing eliminates the influence of out-of-band noise and the influence of the sweep width or code length change, and reduces the calculation amount of feature extraction; The radar excitation signal is radiated by the radar antenna, detected by the electronic reconnaissance equipment connected to the reconnaissance antenna, and the power of the arriving signal is measured. The data is transmitted to the data analysis computer through the network cable to calculate the uncertainty of the radar signal waveform. Compared with the existing radar signal waveform uncertainty test method, the time domain, frequency domain, modulation domain and power domain of the radar signal can be simultaneously completed. test, greatly shortening the test time.

high degree of automation. The invention uses broadband acquisition, storage and analysis equipment to test the time domain, frequency domain and modulation domain of radar signals; uses electronic reconnaissance equipment to connect the reconnaissance antenna to test the power domain of radar signals, and transmits the measurement data to the data analysis computer through the network cable. The determination calculation software performs waveform uncertainty calculation. Compared with the existing radar signal waveform uncertainty test method, the present invention only needs to configure the required waveform parameters in the radar display and control computer after the test environment is configured, and collect the waveform parameters in the wideband acquisition. Store the analysis equipment and the electronic reconnaissance equipment to configure the detection parameters to complete the automatic test. The waveform uncertainty calculation software in the data analysis computer directly outputs the measured radar signal waveform uncertainty value, without the need to repeatedly connect the radio frequency cable, etc., the degree of automation high.

The detection probability is high. The invention adopts the waveform uncertainty calculation software to receive the pulse width, pulse repetition period, working frequency, modulation bandwidth measurement data and power measurement data of the radar signal generated by the broadband acquisition, storage and analysis equipment and the electronic reconnaissance equipment, processes the data, and counts each The number of changes in the measured value of the dimension is used to calculate the uncertainty of the radar signal waveform at the sending time of the radar terminal. Compared with traditional detection methods, it does not add additional logic resources, greatly reduces the amount of calculation, and can quickly complete high-precision detection of signals under the condition of low signal-to-noise ratio. It can not only measure the conventional parameters of radar pulse signals, but also complete modulation. Type identification and modulation parameter measurement, with high detection probability for radar signals.

The scene is real. The invention is equipped with a radar target simulator, directly receives the excitation signal sent by the radar terminal, adopts high-speed digital sampling and processing technology, and performs digital sampling on the excitation signal transmitted by the radar terminal after down-conversion, and stores and modulates the sampled data. , simulate the distance and speed characteristics of the target, and use digital processing to carry out multi-target simulation. The radar target simulator fully considers the task performance of radar as a radio frequency sensor, and the measurement value is closer to the radar usage scenario, and the measurement scenario is real.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and examples.

Fig. 1 is a test principle block diagram of the radar signal waveform uncertainty test system of the present invention.

FIG. 2 is a schematic flow chart of the test of the radar signal waveform uncertainty test system of the present invention.

Detailed ways

In order to make those skilled in the art better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only The embodiments are part of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the scope of protection of the present application.

Referring to FIG. 1, in the preferred embodiment described below, a radar signal waveform uncertainty test system is connected to an electronic reconnaissance device and a broadband acquisition, storage and analysis device of a data analysis computer through a network cable, and the electronic reconnaissance device is connected through a radio frequency cable. The reconnaissance antenna, and the time system equipment connecting the electronic reconnaissance equipment, the broadband acquisition, storage and analysis equipment and the radar terminal to be measured through a low-frequency cable, including: during the measurement process, the radar excitation emitted by the radar terminal The signal is divided into 3 channels by the power divider. Among them, the first radar excitation signal is connected to the radar target simulator through the radio frequency cable. The radar target simulator generates the radar echo signal according to the set parameters, and the radar echo signal passes through the radio frequency The cable is input to the receiving end of the radar terminal; the second radar excitation signal is sent to the broadband acquisition, storage and analysis device through the radio frequency cable, and the broadband acquisition, storage and analysis device collects and stores the second radar excitation signal, and measures in real time. The pulse width, pulse repetition period, working frequency and modulation bandwidth of the radar signal are processed by bandwidth normalization, and the measurement data of the broadband acquisition, storage and analysis equipment is transmitted to the data analysis computer through the network cable; the third radar excitation signal is sent through the radio frequency cable. The electronic reconnaissance device detects the radar radiation signal through the connected reconnaissance antenna, measures the power of the arriving signal, generates the power measurement data of the radar signal, and transmits the power measurement data through the network cable. To the data analysis computer; the waveform uncertainty calculation software in the data analysis computer collects and stores the pulse width, pulse repetition period, operating frequency, modulation bandwidth measurement data of the radar signal generated by the broadband acquisition and analysis equipment and the radar signal generated by the electronic reconnaissance equipment. The power measurement data is processed, the number of changes of the measurement values in each dimension is counted, and the radar signal waveform uncertainty within the transmission time of the radar terminal is calculated.

Optionally, the radar signal waveform uncertainty test system further includes: setting the radar system task type through the radar display and control computer, and controlling the radar terminal computer to generate a radar signal with a specified waveform uncertainty measurement value and an emission excitation signal. start and stop times.

Optionally, during the measurement process, the time system equipment generates a B code signal, and sends the B code signal to the radar terminal, the broadband acquisition, storage and analysis equipment and the electronic reconnaissance equipment through a low-frequency cable, so as to provide the The radar terminal, the broadband acquisition, storage and analysis equipment, the electronic reconnaissance equipment and the test system provide a unified time reference to maintain a high degree of unification of the time between the subject and the test system, and to ensure high-precision synchronous operation of various equipment.

Optionally, the radar signal waveform uncertainty test system further includes: using the radar target simulator to collect the radar transmit signal, simulating the radar target echo signal characteristics according to the radar terminal transmit waveform, and outputting the signal using Injection testing for radar mission performance.

Optionally, the radar signal waveform uncertainty test system further includes: receiving the radar echo signal through the radar terminal, and calculating the distance and speed parameters of the target based on the radar echo signal, so as to realize the preset radar system. task performance with a given distance measurement accuracy and speed measurement accuracy.

Optionally, the radar signal waveform uncertainty test system further includes: using the broadband acquisition, storage and analysis device to collect the radar excitation signal under wired conditions, and to perform the time domain, frequency domain, and modulation domain parameters of the radar excitation signal. Measurement.

Optionally, the radar signal waveform uncertainty testing system further includes: using the broadband acquisition, storage and analysis device to receive the radar excitation signal, and after frequency conversion, amplification and filtering of the radar excitation signal, an intermediate frequency signal is generated, and the intermediate frequency signal is subjected to frequency conversion, amplification and filtering. The front-end of the analog-to-digital converter (ADC) performs short-time Fourier transform (STFT) after sampling, and transforms the signal into the time-frequency domain for analysis and processing. Pulse; use a field programmable gate array (FPGA) counter to count the rising edge and falling edge of the pulse width-preserving pulse statistically to obtain the pulse arrival time, pulse width and pulse repetition period; phase difference frequency measurement of the signal after STFT is obtained. Working frequency; analyze the intra-pulse and inter-pulse characteristics to obtain the modulation bandwidth; save the measured pulse width, pulse repetition period, working frequency, and modulation bandwidth as a pulse description word (PDW) data file and store it in the disk array.

Optionally, the radar signal waveform uncertainty test system further includes: the electronic reconnaissance device collects the radar radiation signal under wireless conditions through the reconnaissance antenna, and measures the power domain of the radar radiation signal, and the radar signal The measured value of power P _t is obtained by further calculating the power of the signal reaching the electronic reconnaissance equipment:

Optionally, the radar signal waveform uncertainty test system further includes: the data analysis computer is provided with radar signal waveform uncertainty calculation software, which collects and stores the radar signal time domain, For the measurement parameters in the frequency domain, modulation domain and power domain, after data elimination and data classification processing are performed in their respective dimensions, the number of measured value changes in each dimension is counted. According to the radar signal waveform uncertainty = the number of changes in the time domain × the change in the frequency domain The calculation formula of quantity × modulation domain variation quantity × power domain variation quantity calculates the waveform uncertainty of the radar signal.

Referring to Figure 2, in the test of radar signal waveform uncertainty, the radar display and control computer, radar terminal computer, radar target simulator, radar antenna, time system equipment, broadband acquisition and storage analysis equipment, electronic reconnaissance equipment and After the various test equipments of the data analysis computer are powered on, the working parameters are configured for the radar terminal, radar target simulator, broadband acquisition and storage analysis equipment, and electronic reconnaissance equipment. Set the radar task type and working mode on the radar display and control computer. The parameters of the radar target are set on the operation interface of the radar target simulator, and the parameters such as center frequency and bandwidth are set on the operation interface of the broadband acquisition, storage and analysis equipment and electronic reconnaissance equipment.

Optionally, the radar signal waveform uncertainty test system further includes: controlling the radar terminal computer to start radiation according to the configured waveform parameters on the radar display and control computer, and the broadband acquisition, storage and analysis equipment and the electronic reconnaissance equipment carry out signal detection. Acquire and measure the parameters of radar signals in the time, frequency, modulation and power domains.

Control the radar terminal computer to stop radiation on the radar display and control computer, stop signal acquisition by the broadband acquisition, storage and analysis equipment and electronic reconnaissance equipment, process the measurement data on the waveform uncertainty calculation software of the data analysis computer, and calculate the radar according to the processed measurement data. Signal waveform uncertainty, get waveform uncertainty measurement results.

The present invention has the following beneficial effects:

It will be appreciated by those skilled in the art that the embodiments of the present application may be provided as a method, a system or a computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

The above are merely examples of the present application, and are not intended to limit the present application. Various modifications and variations of this application are possible for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included within the scope of the claims of this application.

Claims

A radar signal waveform uncertainty test system, which connects an electronic reconnaissance device of a data analysis computer and a broadband acquisition, storage and analysis device through a network cable, connects a reconnaissance antenna of the electronic reconnaissance device through a radio frequency cable, and connects the electronic reconnaissance device through a low-frequency cable. Equipment, broadband acquisition, storage and analysis equipment, and timing equipment of the radar terminal to be measured, including: during the measurement process, the radar excitation signal emitted by the radar terminal is divided into three channels by a power divider, wherein the first The first radar excitation signal is connected to the radar target simulator through the radio frequency cable, and the radar target simulator generates the radar echo signal according to the set parameters, and the radar echo signal is input to the receiving end of the radar terminal through the radio frequency cable; the second channel radar The excitation signal is sent into the broadband acquisition, storage and analysis device through the radio frequency cable, and the broadband acquisition, storage and analysis device collects and stores the second radar excitation signal, and measures the pulse width, pulse repetition period, operating frequency, and frequency of the radar signal in real time. Modulate the bandwidth and perform bandwidth normalization processing, and transmit the measurement data of the broadband acquisition, storage and analysis equipment to the data analysis computer through the network cable; the third radar excitation signal is sent to the radar antenna through the radio frequency cable, and the excitation signal is radiated. The reconnaissance equipment detects the radar radiation signal through the connected reconnaissance antenna, and measures the power of the arriving signal, generates the power measurement data of the radar signal, and transmits the power measurement data to the data analysis computer through the network cable; the waveform in the data analysis computer is not The determination calculation software is based on the pulse width, pulse repetition period, operating frequency, modulation bandwidth measurement data of the radar signal generated by the broadband acquisition and storage analysis equipment and the power measurement data of the radar signal generated by the electronic reconnaissance equipment. Period, operating frequency, modulation bandwidth, and power measurement data are processed, the number of measured value changes in each dimension is counted, and the radar signal waveform uncertainty within the sending time of the radar terminal is calculated.
The radar signal waveform uncertainty test system according to claim 1, wherein the radar signal waveform uncertainty test system further comprises: setting a radar system task type through a radar display and control computer, and controlling the radar terminal computer The start and stop times for generating a radar signal with a specified measure of waveform uncertainty and transmitting an excitation signal.
The radar signal waveform uncertainty test system according to claim 1, characterized in that: in the measurement process, the time system equipment generates a B code signal, and sends the B code signal to the radar terminal through a low-frequency cable. The broadband acquisition, storage and analysis device and the electronic reconnaissance device provide a unified time reference for the radar terminal, the broadband acquisition, storage and analysis device, and the electronic reconnaissance device, so as to keep the time between the subject and the test system. Highly unified to ensure high-precision synchronous operation of various equipment.
The radar signal waveform uncertainty test system according to claim 1, wherein the radar signal waveform uncertainty test system further comprises: using the radar target simulator to collect radar transmit signals, and according to the radar terminal The machine transmit waveform generates radar target echo signals that are used for injection testing of radar mission performance.
The radar signal waveform uncertainty test system according to claim 1, wherein the radar signal waveform uncertainty test system further comprises: receiving a radar echo signal through the radar terminal, and based on the radar echo signal Calculate the distance and speed parameters of the target, and realize the task performance of the preset distance measurement accuracy and speed measurement accuracy of the radar system.
The radar signal waveform uncertainty test system according to claim 1, wherein the radar signal waveform uncertainty test system further comprises: using the broadband acquisition, storage and analysis device to collect the radar excitation signal under wired conditions, and to carry out Measurement of time domain, frequency domain and modulation domain parameters of radar excitation signal.
The radar signal waveform uncertainty test system according to claim 1, wherein the radar signal waveform uncertainty test system further comprises: receiving the radar excitation signal by using the broadband acquisition, storage and analysis device, and converting the radar excitation signal After frequency conversion, amplification and filtering, an intermediate frequency signal is generated. The intermediate frequency signal is sampled by the front-end of the analog-to-digital converter (ADC) and then subjected to short-time Fourier transform (STFT), and the signal is transformed into the time-frequency domain for analysis and processing. The signal threshold performs preliminary detection and screening of the pulse signal to generate a width-preserving pulse; the field-programmable gate array (FPGA) counter is used to count the pulse rising and falling edges of the width-preserving pulse to obtain the pulse arrival time, pulse width and pulse width. repetition period; perform phase difference frequency measurement on the signal after STFT to obtain the working frequency; analyze the intra-pulse and inter-pulse characteristics to obtain the modulation bandwidth; save the measured pulse width, pulse repetition period, operating frequency, and modulation bandwidth as the pulse description word ( PDW) data files and stored in the disk array.
The radar signal waveform uncertainty test system according to claim 1, wherein the radar signal waveform uncertainty test system further comprises: the electronic reconnaissance device collects radar radiation signals under wireless conditions through a reconnaissance antenna, and Carry out the measurement of the power domain of the radar radiation signal, the measured value P t of the radar signal power is obtained by further calculating the signal power reaching the electronic reconnaissance equipment:

Among them, S E is the signal power reaching the electronic reconnaissance equipment, R E is the distance from the radar antenna to the reconnaissance antenna, L E is the receiving loss of the electronic reconnaissance equipment, G E is the gain of the reconnaissance antenna to the direction of the radar antenna, and λ is the signal wavelength .
The radar signal waveform uncertainty test system according to claim 1, wherein the radar signal waveform uncertainty test system further comprises: a data analysis computer is provided with a radar signal waveform uncertainty calculation software, which stores and collects data for the wideband acquisition and storage. Analyze the measurement parameters in the time domain, frequency domain, modulation domain, and power domain of the radar signal sent by the analysis equipment and electronic reconnaissance equipment. After data elimination and data classification processing are performed in their respective dimensions, the number of measured value changes in each dimension is counted. According to the radar Signal waveform uncertainty = time domain variation quantity × frequency domain variation quantity × modulation domain variation quantity × power domain variation quantity calculation formula to calculate the waveform uncertainty of the radar signal.
The radar signal waveform uncertainty test system according to claim 1, wherein the radar signal waveform uncertainty test system further comprises: controlling the radar terminal computer to start radiation according to the configured waveform parameters on the radar display and control computer , the broadband acquisition, storage and analysis equipment and the electronic reconnaissance equipment perform signal acquisition and measure the parameters of the radar signal in the time domain, frequency domain, modulation domain and power domain.