SJ 20740-1999 Battlefield reconnaissance radar performance test method

This standard specifies the conditions and methods for battlefield reconnaissance radar performance testing. This standard applies to battlefield reconnaissance radar (hereinafter referred to as radar) performance testing. SJ 20740-1999 Battlefield reconnaissance radar performance test method SJ20740-1999 Standard download decompression password: www.bzxz.net

Military Standard of the Electronic Industry of the People's Republic of China FL5840
SJ 20740—1999
Test method for performance
of battlefield reconnaissance radarsPublished on November 10, 1999
Implemented on December 1, 1999
Approved by the Ministry of Information Industry of the People's Republic of China1 Scope
1.1 Subject content
1.2 Scope of application
2 Reference documents
3 Definition
4 General requirements
4.1 Requirements for performance test
4.2 Requirements for test equipment and instruments||tt| |4.3 Determination of test results
4.4 Test report
5 Detailed requirements
5.1. Tactical performance test
5.1.1 Scope
5.1.2 Beam working modebzxz.net
5.1.3 Measurement performance
5.1.4 Anti-interference capability
5.1.5 Quick response capability
5.1.6 Remote control capability
5,1.7 Terminal display admission
Target nature discrimination capability
5.1.9 Continuous working time
5.1.10 Power supply mode of the whole machine.
5.1.11 Power consumption of the whole machine
5.2 Technical performance test
5.2.1 Working frequency and bandwidth
5.2.2 Antenna subsystem
5.2.3 Transmitting subsystem
5.2.4 Receiving subsystem
5.2.5 Signal processing subsystem
5.2.6 Terminal subsystem
5.2.7 Interface and human-machine interface
5.2.8 Antenna control and synchronization subsystem
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1 Scope
People's Republic of China Electronic Industry Military Standard Battlefield reconnaissance radar performance test method
Test method for performance
of battlefield reconnaissance radars1.1 Subject content
This standard specifies the conditions and methods for battlefield reconnaissance radar performance test. 1.2 Scope of application
This standard applies to battlefield reconnaissance radar (hereinafter referred to as radar) performance test. 2 Reference documents
GJB74A-98 General specification for military ground radarsGJB887--90 Test method for anti-ground clutter performance of military ground radarsGJB1289-91 Test method for tactical performance of battlefield reconnaissance radarsGJB2072-94 Maintainability test and evaluation
SJ20739-1999 General specification for battlefield reconnaissance radars3 Definitions
This standard adopts the terms and definitions of GJB74A and GJB1289. 4 General requirements
4.1 Requirements for performance tests
Shall comply with the provisions of Chapter 4 of GJB 1289. 4.2 Requirements for test equipment and instruments
SJ20740--1999
a. The instruments and meters required for measurement must comply with the provisions of the product specifications. Home-made equipment must be identified and approved before it can be put into use;
b. The test equipment and instruments must reach the specified error. If there is no special provision, the error should not be less than one-third of the allowable error of the tested radar performance:
The test equipment and instruments must have a qualified certificate issued by a second-level or higher measurement unit with a valid service life.
4.3 Determination of test results
The various test results in this standard meet the indicators specified in the product specifications. Those that meet the requirements of the product specifications are judged as qualified, otherwise they are judged as unqualified.
The Ministry of Information Industry of the People's Republic of China issued on November 10, 1999, and implemented from December 1, 1999
4.4 Test report
The test report should include the following contents:
Brief introduction of the test situation:
Test items:
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Conditions, methods, data and conclusions of each test: c.
Model, name and measurement of test instruments: d.
Sound and image recording materials of the test site:
f.Comments and opinions of the test team on the tested radar. 5 Detailed requirements
5.1 Tactical performance test
5.1.1 Range of action
5.1.1.1 Detection distance
The test shall be carried out in accordance with the method specified in Article 5.1 of G.JB 1289. If the terrain of the test site restricts the distance sampling interval from being set as required above, an observation point for testing shall be selected at a distance not less than R (the detection distance specified in the product specification) according to the site conditions. Let the test target pass through the observation point, and the radar detects the target N ≥ 50 times in the search state, and then processes according to the formula (1) of Article 5.1.4 of GJB1289. The distance from this observation point to the radar is the test value of the radar detection range. 5.t.1.2 Tracking distance
5. 1. 1. 2. 1 Test purpose
Test the tracking distance of the radar.
5.1. 1.2.2 Target characteristics
Select according to the contents of Table 1 of Article 3.14.1.1.1 of SJ20739. 5.1.1.2.3 Test method
a. The test target first starts to move at a place less than 0.8Rmx (Rmax is the maximum detection distance). After the test radar finds the target, the operator immediately tracks the target manually or by moving the radar. Then the target is allowed to enter the distance sampling interval and move from near to far. The operator continues to track the target until the target disappears; b. The maximum distance that can correctly track the target is measured, which is the tracking distance L of this test: C. Repeat the above test steps 10 times (reduced for helicopters as appropriate), and record the actual tracking distance each time. 5.1.1.2.4 Data processing
Take the arithmetic mean of each test value as the test value L of the tracking distance, that is: L=-
Where: L; — the tracking distance test value of the ith tracking target, km; n is the number of valid tracking distance tests.
5.1.1.2.5 Treatment when the test site does not meet the requirements. (f)
If the distance sampling interval cannot be set as required above due to the test site restrictions, an observation point for testing should be selected at a distance not less than R (R is the tracking range of the ith real ear tag) according to the site conditions. During the test, the test radar works in the tracking mode, and the tracking cursor is pressed on the selected observation point (when the target is not moving, the observation point should not appear -2 -
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virtual, etc.), and then the test target is allowed to pass through the observation point back and forth. The operator finds the target based on the moving target Doppler sound and the moving target light spot on the display surface. If the target passes through the observation point n times, the number of times the test radar can correctly find the target is n times. When Pn/n meets the detection probability, the distance from the observation point to the test radar is set as the test value of the tracking range.
5.1.1.3 Minimum range of action
5. 1.1.3.1 Test purpose
Test the minimum range of action of the radar.
5.1.1.3.2 Requirements for the test pool
According to Article 4.1,
The distance from the far end of the target area to the radar under test should be greater than 1.5 times the minimum range of action specified in the product specification. 5.1.1.3.3 Target characteristics
a. Test target: The test target is a target person holding a corner reflector with an effective reflection area of ​​not less than 10m, and the corner reflector is 1.5~2m above the ground: b. Ear tag movement form: The test target moves in a round trip, straight line, hook speed, and radial motion near and far from the radar under test:
c. Ear tag movement speed: The speed of the test target should be within the range specified in the product specification. 5.1.1.3.4 Test method
a. Make the test target move radially from the far end of the national standard area to the near end along the tested radar; b. Manually control the tested radar to track the national standard until the target is just out of sight. Use standard test equipment to record the target distance R:
c: Make the test target return to the same position, and use the standard push test equipment to measure the distance R2d at which the tested radar can just detect the target. Repeat the above steps at least 5 times.
5.1.1.3.5 Data processing
Take the arithmetic mean of each test value as the minimum range test value Rmin, that is: 11
=(R;+R)
Rmin -
Where: Rmm—-minimum range test value, m(R,+Ra)
the ith test value of the minimum range, m:n -- the effective number of tests.
5.1.1.4 Angular search range
5.1.1.4.1 Test purpose
Test the angular search range of the radar.
5. 1. 1. 4. 2 Japanese standard characteristics
Select according to the contents of Table 1 of Article 3.14.1.1.1 of SJ20739. 5.1.t.4.3 Test method
a. The test target is at the minimum value of the azimuth search range specified in the product specification, and the tested radar is in the search state. When the tested radar finds the target, the azimuth value of the target is recorded. b. The test target moves 60°, 120°, 180°, 240°, and 300° in azimuth respectively, until the maximum value of the azimuth search range specified in the product specification is recorded. 5.1.1.4.4 Data processing
Subtract the minimum value of the measured target azimuth from the maximum value of the measured target azimuth, which is the angular search range. 5.1.2 Beam working mode
5.1.2.1 Azimuth beam working mode
5.1.2. 1.1 Test the azimuth beam working mode of the test radar.
5.1.2.1.2 Test method
Specified by product specifications.
5.1.2.2 Elevation beam operation mode
5. 1. 2. 2. 1 Test purpose
Test the radar elevation beam operation mode.
5.1.2.2.2 Test method
Specified by product specifications.
5.1.2.3 Scanning speed
5. 1. 2. 3. 1 Test purpose
Test the radar scanning speed.
5.1.2.3.2 Test method
a. The radar antenna under test is in scanning operation mode: b. Read the antenna scanning range from the monitor of the radar under test; c. Use a timer (stopwatch) to record the time it takes for the antenna to pass through the scanning range. 5.1.2.3.3 Data processing
Where: V,——scanning speed of the antenna in the ith test, deg/s; △,——scanning range of the antenna in the ith test, deg; At, the time required for the antenna to pass through the scanning range in the ith test, s. Repeat the test 5 times, record the test data, and then calculate the mountain fan scanning speed test value Y, according to formula (4):
5.1.2.4 Pitch adjustment (program control) speed
5.1.2.4.1 Test purpose
Test the pitch adjustment speed of the radar.
5.1.2.4.2 Test method
The antenna of the tested radar is in the pitch adjustment working mode: a.
b. Read the pitch angle of the line movement from the monitor of the tested radar: Use a timer (stopwatch) to record the time required for the antenna to move within the corresponding pitch angle range. 5.1.2.4.3 Data processing
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Wherein: Ve is the antenna elevation adjustment speed in the ith test, deg/s4E,——the antenna elevation adjustment range in the ith test, deg:At.—the time required for the antenna to pass through the elevation adjustment range in the ith test, s: (5)
Repeat the test 5 times, record the test data, and then calculate the test value of the elevation adjustment speed V15 according to formula (6)
5.1.3 Measurement performance
5.1.3.1 Accuracy
5. 1.3. 1. 1 Distance accuracy
According to the method specified in Article 5.3 of GJB 1289. 5.1.3.1.2 Azimuth accuracy
According to Article 5.4 of GJB 1289 5.1.3.2 Resolution
5.1.3.2.1 Distance resolution
According to the method specified in Article 5.5 of GJB 1289. 5.1.3.2.2 Azimuth resolution
According to the method specified in Article 5.6 of GJB 1289. 5.1.4 Anti-interference capability
5.1.4.1 Anti-suppressive noise interference
According to the method specified in Article 5.8 of GJB 1289. 5.1.4.2 Anti-co-frequency asynchronous pulse interference
According to the method specified in Article 5.9 of GJB 1289. 5.1.4.3 Anti-ground clutter interference
Perform the test in accordance with the method specified in Article 5 and 11 of GJB 1289. ()
When it is necessary to use mathematical signal processing, and it is difficult to measure the residual amplitude of the ground clutter at the output of the signal processor, or it is difficult to manufacture an active holiday marker, the ground clutter improvement factor test can be carried out in the following manner. 5.1.4.3.1 Simulate ground clutter signal
Couple the radar transmitter output signal to the echo box, and use the ringing signal of the echo box as the simulated ground clutter signal.
5.1.4.3.2 Requirements for the radar under test
5.1.4.3.2.1 Adjust the receiver gain and detection threshold level so that the receiver dynamic range and false alarm rate meet the requirements of the product specification.
5.1.4.3.2.2 The radar under test needs to be powered by the central source of the radar station. Other equipment belonging to the radar under test should be in normal operation.
5.1.4.3.3 Test method
5.1.4.3.3.1 Send the receiver output signal to the signal processor through the video attenuator, and set the video attenuator to 0dB,--
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Use a video RMS voltmeter to measure the signal processor input noise, and calculate the signal processing input noise root mean square value Oar according to formula (7):
G =1.13 Vne
Where:. Video RMS voltmeter reading, V. (7)
5.1.4.3.3.2 The radar under test is in the search state and performs moving target detection. Adjust the target detection threshold so that there are few moving target false alarm spots caused by receiver noise on the display screen. 5.1.4.3.3.3 Use an echo box to generate a ringing signal, which is output by the receiver and input to the input of the signal processor through a video attenuator. Use an oscilloscope to monitor the ringing signal at the input of the signal processor, adjust the echo box to maximize the ringing signal input, and then adjust the video attenuator to make the number of dynamic national standard false alarm light spots caused by the ringing signal on the display screen the same as the number of dynamic monthly standard false alarm light spots caused by the receiver noise (excluding dynamic automatic standard false alarm light spots caused by transmitter leakage). Then use an oscilloscope to measure the amplitude of the ringing signal at the input end of the signal processor, record it as V, and calculate the measured minimum ground clutter improvement factor I by formula (8):
I, -20 lg V/ou.**
5.1.4.3.3.4 Repeat the above test 10 times at 5 point frequencies, record the relevant measurement data, and calculate the measured average value Io by formula (9): L
Where: I is the arithmetic mean value of I measured, dB: l—I. value measured in the ith test, dB. 5.1.4.4 Anti-rain (snow) interference
Perform the test according to the method specified in Article 5.10 of GJB 1289. 5.1.4.5 Frequency conversion capability
5. 1. 4. 5. 1 Test purpose
To test the frequency conversion capability of radar.
5.1.4.5.2 Test method
The radar under test operates at the lowest operating frequency, and the frequency value Fmina is tested by a spectrum analyzer.
b. The radar under test operates at the highest operating frequency, and the frequency value Fmx△fFmax\Fmin is tested by a spectrum analyzer. The value is the frequency conversion range of the radar under test; (8)
d. The radar under test operates at the lowest operating frequency, and the operating frequency is changed to make it work at the highest operating frequency. When the operating frequency is changed, the stopwatch is turned on to record the time. When the radar under test works stably at the highest operating frequency, the stopwatch is turned off. The time recorded by the stopwatch is the frequency conversion time t that the test radar needs to achieve. Repeat the above test 5 times, and calculate the frequency conversion time
according to formula (10) Where: frequency conversion time,
t - frequency conversion time of the ith test, s. 5.1.4.6 Polarization ability
5.1.4. 6.,1 Test purpose
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To test the polarization ability of Xiaoda.
5.1.4.6.2 Test method
&． The radar under test is in receiving state:
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b. Set up a false target simulator outside the blind area of ​​the radar under test; according to the requirements of the product specifications, change the polarization mode of the false target simulator antenna and measure the c
output signal of the radar receiver.
5.1.5 Rapid response capability
5.1.5.1 Test purpose
According to the rapid response capability of the radar, including the time from power-on to normal operation, radar setup time, and system self-check time.
5.1.5.2 Test method
Use a stopwatch to record the time from the moment the radar under test is turned on until the radar transmitter works normally and receives the echo. a.
This period of time is the time from the radar being powered on to the normal operation of the radar; b. The time from the radar under test entering the position to being able to power on is the radar setup time; heart. The time from the start of the self-test of the radar under test to the completion of the self-test and the giving of the self-test result is the self-test time. 5.1.6 Control capability
5.1.6.1 Test purpose
Test the remote control capability of the radar
5.1.6.2 Test method
Make the radar work normally at the specified remote control distance. 5.1.7 Terminal display and recording
5. 1. 7. 1 Image display
5. 1.7. 1. 1 Test purpose
Test whether the radar image display mode, display selection, data recording mode, etc. meet the requirements of product specifications. 5.1.7.1.2 Test method
Make the radar under test work normally and check whether its image display mode, display size, and recording mode meet the requirements of product specifications.
5.1.7.2 Intelligence transmission capability
According to the method specified in Article 5.12 of GJB1289. 5.1.8 Target property discrimination capability
According to the method specified in Article 5.7 of GJB1289. 5.1.9 Continuous operation time
According to the method specified in Article 5.14 of GJB1289. 5.1.10 Power supply mode of the whole machine
According to the method specified in Article 5.15 of GJB1289. 5.1.11 Power consumption of the machine
According to the method specified in Article 5.16 of GJB1289. 5.2 Technical performance test
5.2.1 Working frequency and bandwidth
5.2.1.1 On the test day
Inspect the working frequency and bandwidth of the radar.
5.2.1.2 Test method
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5.2.1.2.1 Carry out the test after preheating for 15 minutes. 5.2.1.2.2 Use a frequency meter or a wavelength meter to test the operating frequency f and the frequency distribution range Bw of the radar under test. 55.2.1.3 Data processing
The frequency distribution range is calculated according to formula (11): Bw frax- fanin
Where: Bw—frequency distribution range, MHz: Ju is the measured value of the highest operating frequency, MHz; fruin is the measured value of the lowest operating frequency, MHz. 5.2.2 Antenna subsystem
5.2.2.1 Antenna gain and operating bandwidth
5. 2. 2. 1. 1 Test purpose
To test the antenna gain and operating bandwidth of the radar. 5.2.2.1,2 Test method
Figure 1 Antenna gain test block diagram
The test site should be open in the azimuth plane, and the distance between the beacon antenna and the antenna under test should be greater than 80Ⅱ. Connect the antenna and test equipment according to Figure 1:
b. Make the test receiving equipment and signal source work stably at the lowest frequency of the working bandwidth; c. Adjust the beacon antenna and the antenna under test so that their beam maximum directions are aligned with each other. At this time, the output signal of the receiving equipment is the maximum. Record the indication value Y of the receiving equipment and the attenuator scale A (dB); d. Adjust the microwave switch to connect the variable precision attenuator to the standard antenna, adjust the standard antenna so that its beam maximum direction is aligned with the beacon antenna beam maximum direction, adjust the variable precision attenuator so that the indication value of the test receiving equipment is Y, and record the attenuator scale Am (dB) at this time; e: Calculate the gain G of the linear polarization antenna according to formula (12): G = G, +(A..- A..).
Where: G. -—The linear polarization gain of the known standard antenna at the measurement frequency point, dB. f. Repeat the above measurement three times at the same measurement point, and the arithmetic mean is the measured value of the antenna gain at this frequency point:
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Change the signal source frequency to make it work at another test frequency point. Re-adjust the test receiving equipment and repeat the above steps c, d, e, and f. h. Select 6 test points, including the minimum value and the maximum value of the antenna working bandwidth corresponding to the frequency given in the product specification: i. Select the minimum gain value measured at the 6 frequency points as the test value of the linear polarization antenna gain: j. If the circular polarization antenna gain is measured, repeat the test steps b, c, and d, and then calculate the circular polarization large linear gain GAc according to formulas (13) and (14): Then proceed to steps f, g, and h: Gac = Go +(Ao- Acm) + Gar***GAr=20 lg[ 1+ 1/(10-4r/20)]
Where: Gar is the polarization mismatch correction factor, dB. Ar is the circular polarization axial power axis ratio expressed in decibels, dB. k. The antenna working bandwidth has been tested in item h above. 5.2.2.2 Sidelobe level beamwidth
5. 2. 2. 2. 1 Test purpose
To test the radar sidelobe level and beamwidth. 5.2.2.2.2 Test method
a. Use a computer to control the turntable on which the antenna under test is installed and use the computer to process data. The antenna pattern, half-power beamwidth and sidelobe level can be automatically measured. The test block diagram is as follows:
Figure 2 Antenna beamwidth and sidelobe level test block diagram
b. Configure the equipment according to the above figure, install the antenna under test on the test turntable according to the actual working state, start the signal source and receiving equipment for preheating, and make it work at a specified test frequency: c. Operate the computer to control the turntable movement, stop the rotation when the microvoltmeter indicates the maximum, carefully adjust the variable precision attenuator to set its attenuation value to zero, and then start the calibration process. Gradually increase the attenuation value of the attenuator, and at the same time, the computer records the data corresponding to the attenuation value one by one until the microvoltmeter reads zero: d. Operate the computer to rotate the turntable to drive the antenna under test to scan continuously within the specified range, so as to obtain the antenna radiation pattern, half-power point beam width and side lobe level, and print and record them through a recorder or printer; e. Change the signal source frequency and repeat items b, c, and d until the test is completed at 6 frequency points. The selection of frequency points is the same as item h of Article 5.2.2.1.2; SJ 207401999
f. Rotate the installation method of the tested large line by 90° and test according to items b, c, d, and e to complete the test of the elevation surface:
The narrowest half-power point beam width and the highest side-recognition level decibel value obtained at the 6 test frequency points are used as test values.
5.2.2.3 Polarization mode
Same as the method specified in Article 5.1.4.6.
5.2.3 Transmitting subsystem
5.2.3.1 Operating frequency range
5. 2. 3. 1. 1 Test purpose
Test the radar operating frequency range.
5.2.3.1.2 Test method
a. Input the output signal of the radar transmitter to the spectrum analyzer through the directional coupler and attenuator: b. Change the transmitter output frequency, and use the spectrum analyzer to directly read the minimum frequency value and the maximum frequency value of the transmitting frequency. 5.2.3.2 Output power
5.2.3.2.1 Test purpose
Test the radar transmitter output power.
5.2.3.2.2 Test method
a: Input the transmitter output signal into the power meter through a strictly calibrated directional coupler for testing: b. Change the transmission frequency and record the corresponding power value. 5.2.3.3 Transmitted signal waveform
5.2.3.3.1 On the test day
Inspect the transmit signal waveform of the radar transmitter. 5.2.3.3.2 Test method
Send the radar transmit signal to the detector through the directional coupler and attenuator output, connect the detection signal to the oscilloscope, and directly read the leading edge, trailing edge and pulse width of the transmit waveform from the oscilloscope. 5.2.3.4 Transmitted signal quality
5.2.3.4.1 Frequency stability of transmitted signal 5. 2. 3. 4. 1. 1 Test purpose
To test the stability of radar transmitted signal. 5. 2. 3. 4. 1. 2 Test method
Send the tested radar transmitted signal to the stability tester through the directional coupler and attenuator, and directly measure the stability of the transmitted signal.
5.2.3.4.2 Front edge jitter of transmitted signal
5. 2. 3. 4. 2. 1 Test purpose
To test the front sliding jitter of radar transmitted signal
5.2. 3. 4.2.2 Test method
Send the tested radar transmitted signal to the detector through the directional coupler and attenuator, and send the detected signal to the storage oscilloscope. When the transmitter 1 is in operation for 5 minutes, the storage oscilloscope stops sampling and then prints out the output. 5.2.4 Receiving subsystem
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