CN108107413A - A kind of radar simulator calibration system - Google Patents
A kind of radar simulator calibration system Download PDFInfo
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- CN108107413A CN108107413A CN201810019409.6A CN201810019409A CN108107413A CN 108107413 A CN108107413 A CN 108107413A CN 201810019409 A CN201810019409 A CN 201810019409A CN 108107413 A CN108107413 A CN 108107413A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/40—Means for monitoring or calibrating
- G01S7/4052—Means for monitoring or calibrating by simulation of echoes
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Abstract
The present invention provides a kind of radar simulator calibration system, and part, echo signal reception part and data processing section occurs including test signal；When testing tested radar simulator, test signal occurs part and sends test signal to tested radar simulator, and the echo signal reception part receives the echo-signal of tested radar simulator；Data processing section is used to obtain the echo-signal of tested radar simulator output；Using statistical test, tested uniformity between the echo-signal of radar simulator and Standard echo signal is assessed, obtains the evaluation result of tested radar simulator；Standard echo signal is obtained according to the standardized mathematical model of test signal and tested radar simulator.Technical solution provided by the invention judges the performance of tested radar simulator using statistical test, so as to solve the problems, such as that accurate evaluation can not be carried out to radar simulator since test signal is complicated.
Description
Technical Field
The invention belongs to the technical field of radar target simulator calibration, and particularly relates to a radar target simulator calibration system.
Background
The radar target simulator is specially developed for the test requirements of radar guided missile products, can simulate and reproduce echo signals containing radar targets and environmental information, and is widely applied to debugging and performance evaluation of radar systems and subsystems. By adopting the radar target simulation technology, the main characteristic parameters in the radar system can be quickly checked, so that the development period of the radar is shortened, and the development cost of the radar is reduced.
However, the current radar target simulator has no complete and systematic calibration method, and can only simply test parameters of output signals of the radar target simulator, wherein the parameters are related to power and frequency. At present, no corresponding calibration method and means exist for verifying the accuracy of target, interference and clutter analog signals output by a radar target simulator, and how to quantitatively characterize, test and evaluate complex modulation signals output by the target simulator becomes a technical problem.
The output signal of the radar target simulator needs to simulate the target echo, the interference encountered by the detection signal and the clutter existing in the background, and a complex mathematical formula is needed to describe so as to establish a mathematical model of the target, the interference and the clutter signal. For a sine wave signal with a mathematical model of f (t) = Asin ω t, parameters such as amplitude A, frequency ω and distortion can be used for evaluation, but for the output of the radar target simulator and various physical quantities x 1 ,x 2 …x n All correlated complex modulation signal f (x) 1 ,x 2 …x n ) It cannot be proved whether the characteristics meet the expected requirements, whether the characteristics are consistent with the theoretically designed model, and whether the real scene can be simulated and the accurate evaluation can be obtained.
Disclosure of Invention
The invention provides a calibration system for a radar target simulator, which is used for solving the problem that the radar target simulator cannot be accurately evaluated due to complex test signals in the prior art.
In order to achieve the purpose, the technical scheme of the invention is as follows:
system scheme 1: a radar target simulator calibration system comprises a test signal generation part, an echo signal receiving part and a data processing part;
when the tested radar target simulator is tested, the test signal generating part sends a test signal to the tested radar target simulator, and the echo signal receiving part receives an echo signal of the tested radar target simulator;
the data processing section is configured to: acquiring an echo signal output by a radar target simulator to be detected; evaluating the consistency between the echo signal of the measured radar target simulator and the standard echo signal by adopting a statistical test method to obtain an evaluation result of the measured radar target simulator; and the standard echo signal is obtained according to the test signal and a standard mathematical model of the tested radar target simulator.
According to the technical scheme provided by the invention, the consistency between the echo signal of the radar target simulator to be tested and the standard signal obtained according to the mathematical model of the radar target simulator to be tested is verified by adopting a statistical test method, and the performance of the radar target simulator to be tested is judged according to the consistency between the echo signal and the standard signal, so that the problem that the radar target simulator cannot be accurately evaluated due to the complex test signal is solved.
System scheme 2: on the basis of the system scheme 1, the statistical test method is a mean difference hypothesis test method, and the specific method is as follows: setting the variance of echo signals of a tested radar target simulator as mu 1 Variance μ of standard echo signal 2 (ii) a Test hypothesis Condition is H 0 :μ 1 –μ 2 =0, test formula
WhereinT is the statistical result, x is x 1 ,x 2 ,…x n Is determined by the average value of (a),is y 1 ,y 2 ,…y n Average value of (3), n 1 Number of samples of X, n 2 Number of samples of Y, s 1 Is the standard deviation of the X sample, s 2 Is the standard deviation of the Y samples;
at significant levels of alpha, when T < T α (n 1 +n 2 -2) checking the hypothesis condition H 0 If the measured radar target simulator is established, judging that the measured radar target simulator is consistent with the standard mathematical model; when T is>t α (n 1 +n 2 -2) checking the hypothesis condition H 0 If the measured radar target simulator is not consistent with the standard mathematical model, judging that the measured radar target simulator is inconsistent with the standard mathematical model.
System scheme 3: on the basis of the system scheme 1 or 2, when speed interference is applied to an output echo of the measured radar target simulator, the speed interference parameter of the measured radar target simulator is calibrated, and the method comprises the following steps:
acquiring a test signal sent by the test signal part and an echo signal of the tested radar target simulator, and performing Fourier transform on the test signal and the echo signal to obtain frequency spectrums of the two; obtaining the Doppler frequency of the echo signal through the frequency difference between the test signal and the echo signal; and calculating the change of the Doppler frequency of the echo signal on a time axis, and calibrating the speed interference of the measured radar target simulator.
System scheme 4: on the basis of the system scheme 1 or 2, when the distance interference is applied to the output echo of the measured radar target simulator, the distance interference calibration is carried out on the measured radar target simulator, and the method comprises the following steps:
acquiring a reference signal of a modulation pulse input end of a measured radar target simulator and an echo signal generated by the radar target simulator for analysis, and calculating a time difference between a first set pulse echo signal starting point and a first set reference signal starting point to obtain distance information; and (3) obtaining the change of the delay time on a time axis through analysis and calculation of equal interval time, and calibrating the distance interference parameters of the measured radar target simulator.
System scheme 5: on the basis of the system scheme 1 or 2, the test signal generating part comprises a pulse source and a microwave source, the data processing part is connected with control interfaces of the pulse source and the microwave source, an output end of the pulse source is connected with an input end of the microwave source, and the microwave source is used for sending test signals.
System scheme 6: on the basis of the system scheme 1 or 2, the echo signal receiving part comprises a frequency conversion module, wherein the input end of the frequency conversion module is used for receiving an echo signal of the radar target simulator to be tested; the data processing part is connected with the output end of the frequency conversion module.
System scheme 7: on the basis of the system scheme 6, the frequency conversion module Ka frequency conversion unit and the Ku frequency conversion unit; the system comprises a Ku frequency conversion unit and a tested radar target simulator, wherein the Ku frequency conversion unit is used for carrying out down-conversion of a Ka frequency band on echo signals of the tested radar target simulator, and the Ku frequency conversion unit is used for carrying out down-conversion of a Ku frequency band on echo signals of the tested radar target simulator.
Drawings
FIG. 1 is a schematic structural diagram of a calibration system of a radar target simulator in an embodiment;
FIG. 2 is a schematic diagram of a frequency conversion unit in an embodiment;
fig. 3 is a software structure and a flowchart of a radar target simulator calibration system.
Detailed Description
The invention provides a calibration system for a radar target simulator, which is used for solving the problem that the radar target simulator cannot be accurately evaluated due to complex test signals in the prior art.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a radar target simulator calibration system comprises a test signal generation part, an echo signal receiving part and a data processing part;
when the tested radar target simulator is tested, the test signal generating part sends a test signal to the tested radar target simulator, and the echo signal receiving part receives an echo signal of the tested radar target simulator;
the data processing section is configured to: acquiring an echo signal output by a radar target simulator to be detected; evaluating the consistency between the echo signal of the measured radar target simulator and the standard echo signal by adopting a statistical test method to obtain an evaluation result of the measured radar target simulator; and the standard echo signal is obtained according to the test signal and a standard mathematical model of the tested radar target simulator.
The technical solution of the present invention will be further explained with reference to the specific embodiments.
The embodiment provides a calibration system for a radar target simulator, which is used for evaluating the performance of the radar target simulator.
The structure of the calibration system for a radar target simulator provided by this embodiment is shown in fig. 1, and includes a test signal generation section, an echo signal reception section, and a data processing section.
The test signal generating part comprises a pulse source and a microwave source, wherein the output end of the pulse source is connected with the input end of the microwave source, the pulse source is used for generating pulses, and the output signal of the microwave source is used for simulating the test signal of the seeker transmitter.
The microwave source sends the generated test signal to the tested radar target simulator, and the tested radar target simulator transmits an echo signal according to the received test signal.
The echo signal receiving part comprises a frequency conversion module, and the input end of the frequency conversion module is used for receiving an echo signal of the radar target simulator to be tested; the data processing part is connected with the output end of the frequency conversion module.
The system comprises a frequency conversion module Ka frequency conversion unit and a Ku frequency conversion unit, wherein the Ka frequency conversion unit comprises a corresponding rapid frequency measuring machine and a rapid frequency conversion frequency synthesizer and is used for carrying out Ka frequency band down conversion on a received echo signal of a target simulator of a radar to be measured; the Ku frequency conversion unit includes a corresponding fast frequency measuring machine and a frequency agile frequency synthesizer, and is configured to perform frequency down conversion of a Ku frequency band on a received echo signal of the target simulator of the radar to be measured, as shown in fig. 2.
The data processing part comprises an industrial personal computer control unit which is connected with the pulse source and the microwave source and is connected with the output end of the data acquisition unit. The industrial control machine control unit controls the pulse source to generate pulse signals and controls the microwave source to output signals simulating the transmitting of the seeker transmitter.
When the tested radar target simulator needs to be calibrated, the test signal sending part sends a test signal to the modulation pulse input end of the tested radar target simulator; and after receiving the test signals, the tested radar target simulator respectively generates corresponding echo signals.
After receiving an echo signal of the radar target simulator to be tested, the echo signal receiving part performs frequency domain analysis on the echo signal, wherein the analysis relates to parameters including power, frequency, modulation and the like; the Ka wave band frequency conversion module carries out Ka wave band down-conversion on the corresponding echo signal, the Ku wave band frequency conversion module carries out Ku wave band down-conversion on the corresponding echo signal, and the signal after frequency conversion is sent to a data acquisition unit of the data processing part.
And the data acquisition unit of the data processing part is used for sampling the speed interference signal and the distance interference signal in a time domain and storing large-capacity sampling data in an interference working period in real time. The data acquisition unit sends the data after analysis and processing to the industrial control machine control unit, and the industrial control machine control unit is a control core of the radar target simulator calibration device and is used for function setting, communication control, data processing, calculation and analysis, report generation and the like of the whole device.
The data processing part is provided with calibration software, the calibration software is provided with a standard mathematical model of the tested radar target simulator, and a standard echo signal can be obtained through calculation according to the test signal and the standard mathematical model of the tested radar target simulator.
After the industrial control unit receives the data sent by the data acquisition unit, the echo signal of the radar target simulator to be tested and the data generated by the calibration software according to the mathematical model of the radar target simulator to be tested are subjected to consistency analysis by adopting a statistical test method, so that the consistency between the actual test result of the radar target simulator to be tested and the data obtained according to the mathematical model is obtained, and the aim of checking the radar target simulator to be tested is fulfilled.
In this embodiment, when consistency analysis is performed on the echo signal of the measured radar target simulator and the data obtained according to the mathematical model, the statistical test method adopted is a mean difference hypothesis test method.
If a standard mathematical model based on a measured radar target simulator is used, a MATLAB simulation software is used for obtaining a standard echo signal in the time domain as y 1 ,y 2 ,…y n (ii) a The echo signal of the measured radar target simulator received from the data acquisition unit is x 1 ,x 2 ,…x n (ii) a And quantitatively evaluating the output characteristics of the radar target simulator to be tested by adopting a mean difference hypothesis test method in a statistical test method.
False mean differenceSetting the variance of the echo signal X of the tested radar target simulator as mu by evaluation of a test method 1 Variance μ of standard echo signal Y 2 。
Examination hypothesis H 0 :μ 1 –μ 2 And =0. Requiring test statistics under the condition of original hypothesis
WhereinT is the statistical result, x is x 1 ,x 2 ,…x n Is determined by the average value of (a) of (b),is y 1 ,y 2 ,…y n Average value of (3), n 1 Number of samples of X, n 2 Number of samples of Y, s 1 Is the standard deviation of the X sample, s 2 Is the standard deviation of the Y sample;
at significant levels of alpha, when T < T α (n 1 +n 2 H in (2) 0 And if so, judging that the echo signal of the measured radar target simulator is not obviously different from the standard echo signal, namely the echo signal is consistent with the standard echo signal. When T is>t α (n 1 +n 2 H in (2) 0 If the difference is not true, the echo signal of the radar target simulator to be detected is judged to be obviously different from the standard echo signal, namely the echo signal and the standard echo signal are inconsistent.
The significance level is a small probability criterion that is allowable as a judgment limit when a hypothesis test is performed, and the larger the value of the significance level is, the higher the possibility that the original hypothesis is accepted is. Hypothesis testing was often evaluated with a significance level of α =0.05 selected.
The present calibration apparatus can perform the above-described hypothesis testing at a plurality of points in the time domain, i.e., the time axis. And finally, the conclusion that whether the actual output of the tested radar target simulator is consistent with the data obtained according to the standard mathematical model of the tested radar target simulator or not is obtained under the significance level alpha = 0.05.
When speed and distance interference is applied to the output echo of the measured radar target simulator, the measured radar target simulator needs to be calibrated, wherein the calibration comprises speed interference parameter calibration and distance interference parameter calibration.
And (3) calibrating a speed interference parameter: obtaining a test signal f input into a target simulator of a radar to be tested 0 And an echo signal f output by the tested radar target simulator 1 Fourier transform is carried out on the two signals to obtain a test signal f 0 And echo signals f generated by a tested radar target simulator 1 The frequency spectrum of (a); determining the Doppler frequency f of an echo signal by measuring the frequency difference of two signals d ＝f 1 -f 0 And further calculating the change of the Doppler frequency on a time axis, and quantitatively calibrating the speed interference parameters of the measured radar target simulator.
Distance interference parameter calibration: simultaneously acquiring and storing a reference signal at the modulation pulse input end of a measured radar target simulator and an echo signal generated by the measured radar target simulator, and analyzing the stored data by adopting Matlab; calculating the time difference between the starting point of the echo signal of the first set transmission pulse and the starting point of the reference signal of the first set transmission pulse, and calculating to obtain distance information; and analyzing and calculating the equal interval time to obtain the change of the delay time on a time axis, thereby quantitatively calibrating the distance interference parameters of the measured radar target simulator.
The present embodiment provides a calibration system for a radar target simulator, the software structure and process of which are shown in fig. 3, including
A login module: a real-name system is adopted, and a login password and user authority are provided;
a system calibration module: the device is used for parameter calibration and equipment self-calibration;
a system test module: the target model modeling module is used for generating a predicted echo signal of a target and an interference signal through mathematical modeling; the device control module is used for controlling signal sources, pulse sources, microwave switches, spectrum analyzers and other test devices; the model checking module is used for carrying out consistency analysis on the collected data and the predicted echo signal and giving a judgment result;
a resource configuration module: the method is used for configuring system resources, and comprises configuration of a GPIB bus instrument in a system, initialization setting of the instrument, setting of an operation mode and the like;
a data processing module: the method is used for real-time storage, playback, calling, query and the like of test data.
Claims (7)
1. A radar target simulator calibration system comprises a test signal generation part, an echo signal receiving part and a data processing part;
the method is characterized in that when the tested radar target simulator is tested, the test signal generating part sends a test signal to the tested radar target simulator, and the echo signal receiving part receives an echo signal of the tested radar target simulator;
the data processing section is configured to: acquiring an echo signal output by a radar target simulator to be detected; evaluating the consistency between the echo signal of the measured radar target simulator and the standard echo signal by adopting a statistical test method to obtain an evaluation result of the measured radar target simulator; and the standard echo signal is obtained according to the test signal and a standard mathematical model of the tested radar target simulator.
2. The system of claim 1, wherein the statistical test method is a mean difference hypothesis test method, and the method comprises: setting the variance of the echo signal of the tested radar target simulator as mu 1 Variance μ of standard echo signal 2 (ii) a Test hypothesis Condition is H 0 :μ 1 –μ 2 =0, test formula is
WhereinT is the statistical result, and T is the statistical result,is x 1 ,x 2 ,…x n Is determined by the average value of (a),is y 1 ,y 2 ,…y n Average value of (1), n 1 Number of samples of X, n 2 Number of samples of Y, s 1 Is the standard deviation of the X sample, s 2 Is the standard deviation of the Y samples;
at significant levels of alpha, when T < T α (n 1 +n 2 -2) checking the hypothesis condition H 0 If the measured radar target simulator is established, judging that the measured radar target simulator is consistent with the standard mathematical model; when T is>t α (n 1 +n 2 -2) checking the hypothesis condition H 0 If the measured radar target simulator is not consistent with the standard mathematical model, judging that the measured radar target simulator is inconsistent with the standard mathematical model.
3. The system of claim 1 or 2, wherein when a velocity disturbance is applied to the output echo of the measured radar target simulator, the velocity disturbance parameter of the measured radar target simulator is calibrated by:
acquiring a test signal sent by the test signal part and an echo signal of the tested radar target simulator, and performing Fourier transform on the test signal and the echo signal to obtain frequency spectrums of the test signal and the echo signal; obtaining the Doppler frequency of the echo signal through the frequency difference between the test signal and the echo signal; and calculating the change of the Doppler frequency of the echo signal on a time axis, and calibrating the speed interference of the measured radar target simulator.
4. The system for calibrating the radar target simulator according to claim 1 or 2, wherein when the measured radar target simulator outputs echoes with range interference, the range interference calibration is performed on the measured radar target simulator by:
acquiring a reference signal of a modulation pulse input end of a measured radar target simulator and an echo signal generated by the radar target simulator for analysis, and calculating a time difference between a first set pulse echo signal starting point and a first set reference signal starting point to obtain distance information; and analyzing and calculating the equal interval time to obtain the change of the delay time on a time axis, and calibrating the distance interference parameters of the measured radar target simulator.
5. The radar target simulator calibration system according to claim 1 or 2, wherein the test signal generation part comprises a pulse source and a microwave source, the data processing part is connected with the control interfaces of the pulse source and the microwave source, the output end of the pulse source is connected with the input end of the microwave source, and the microwave source is used for transmitting the test signal.
6. The calibration system of the radar target simulator according to claim 1 or 2, wherein the echo signal receiving part comprises a frequency conversion module, and an input end of the frequency conversion module is used for receiving an echo signal of the radar target simulator to be tested; the data processing part is connected with the output end of the frequency conversion module.
7. The radar target simulator calibration system of claim 6, wherein the frequency conversion modules are a Ka frequency conversion unit and a Ku frequency conversion unit; the system comprises a Ka frequency conversion unit, a Ku frequency conversion unit and a tested radar target simulator, wherein the Ka frequency conversion unit is used for carrying out Ka frequency band down-conversion on echo signals of the tested radar target simulator, and the Ku frequency conversion unit is used for carrying out Ku frequency band down-conversion on echo signals of the tested radar target simulator.
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| GB2628804A (en) * | 2023-04-05 | 2024-10-09 | Bae Systems Plc | Apparatus and method |
| CN116520270A (en) * | 2023-07-04 | 2023-08-01 | 四川天中星航空科技有限公司 | Radar electronic warfare testing method based on evaluation model |
| CN116520270B (en) * | 2023-07-04 | 2023-09-05 | 四川天中星航空科技有限公司 | Radar electronic warfare testing method based on evaluation model |
| CN117075063A (en) * | 2023-10-13 | 2023-11-17 | 大尧信息科技(湖南)有限公司 | Radar ranging self-calibration method, system, equipment and medium based on software definition |
| CN117075063B (en) * | 2023-10-13 | 2024-01-19 | 大尧信息科技(湖南)有限公司 | Radar ranging self-calibration method, system, equipment and medium based on software definition |
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