SJ 20664-1998 Test method for tactical performance of armored vehicle-mounted reconnaissance radar
Some standard content:
Military Standard of Electronic Industry of the People's Republic of China FL5840
SJ 20664 — 1998
Armored Vehicle-mounted Reconnaissance Radar
Tactical Performance Test Method
Series and products of microwave circuitsProducts of microwave solid state noise sources series1998.03-11Published
1998-05-01Implementation
Approved by the Ministry of Electronics Industry of the People's Republic of China 1 Scope
1.1 Subject content
1.2 Scope of application
2 Referenced documents
3 Definitions…
3.1 Radar under test
3.2 Test undertaker．
3.3 Visual conditions
4 General requirements
4.1 Requirements for the radar under test
4.2 Inspection and calibration of the radar under test
4.3 Guarantee of the technical status of the radar under test during the test4.4 Test site of the radar under test
4.5 Requirements for test equipment and instruments
4.6 Requirements for operators
4.7 Interruption test
4.8 Recovery test
4. 9 Test records and test reports
5 Detailed requirements
Method 101
Method 102
Method 103
Method 104
Method 105
Method 106
Method 107
Method 108
Method 109
Method 110
Method 111
Radar detection range test method||t t||Test method for radar minimum detection distance
Test method for Hoda accuracy
Test method for radar range resolution
Test method for required angle (azimuth) resolutionTest method for anti-ground clutter interference
Test method for target visibility in radar clutterTest method for radar anti-rain (book) interference
Test method for anti-noise interference
Test method for anti-co-frequency asynchronous pulse interference
Test method for multi-target processing capability
Method 112 Test method for target type discrimination capabilityMethod 113 Test method for radar power supply mode
Method 114 Test method for radar power consumption
Method 115 Test method for erection time and dismantling timeAppendix A (reference)Tactical performance test record table
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People's Republic of China Electronic Industry Military Standard Armored vehicle-mounted reconnaissance radar tactical performance test method performarice tests for recordmaissniceradars mounted in annoured years1Scope
1.1Subject content
SJ 20664 - 1998
This standard specifies the tactical performance test method of armored vehicle reconnaissance radar (hereinafter referred to as radar). 1.2 Scope of application
This standard applies to the test of tactical performance of armored vehicle reconnaissance radar. 2 Referenced documents
CB3784-83 Radar terminology
GJB74.2-85 General technical conditions for military ground radars Common terminology GJB74.685 General technical conditions for military ground radars Environmental conditions requirements and test methods GB74.11-89 General technical conditions for military ground radars Gunnery radar flight inspection specifications CJB887-90 Test method for anti-ground clutter performance of military ground radars GJB1289-91 Test method for tactical performance of battlefield reconnaissance radar 3 Definitions
For any terms not defined in this standard, CB3784 and CJB 74.2 shall prevail. 3.1 Radar measured radar
Armored vehicle reconnaissance radar submitted for tactical performance test. 3.2 Testertext-supporting partThe unit or national identification test range that undertakes the test. 3.3 Line-of-sight condition line-of-sight
means that there are no obstacles within the line of sight between the tested radar and the tested target. Issued by the Ministry of Electronics Industry of the People's Republic of China on March 11, 1998 and implemented on May 1, 1998
4 General requirements
4.1 Requirements for the tested radar
SJ 20664 1998
4.1.1 For the radar to be tested, the manufacturer shall submit the following information to the tester in advance: a. Product specifications;
b. Random documents.
4.1.2 The tested radar must meet the technical performance specified in the product specifications and pass the inspection. 4.2 Inspection and calibration of the tested radar
4.2.1 Before the test, the following main technical parameters that directly affect the tactical indicators of the tested radar shall be inspected. For different types of radars, the following parameters shall be added or subtracted according to the product specifications:
a. Line pattern, gain, antenna and feeder subsystem bandwidth, voltage standing wave ratio and loss: b. Transmitter operating frequency, transmission power, RF spectrum, envelope waveform and its parameters; c. Receiver noise system (or sensitivity), intermediate frequency, bandwidth, dynamic range; d. Improvement factor, speed response characteristics;
e. Antenna fan width, fan center and fan speed; f. Photoelectric axis matching accuracy;
n. Lifting height and speed of the lifting mechanism system; h. Platform leveling accuracy and time;
i. Calibration device calibration azimuth.
4.2.2 The calibration of the radar under test shall be carried out on a fixed site after geodetic survey. The calibration items include: a. Horizontal adjustment;
b. Azimuth calibration;
c. Elevation calibration
d. Range zero calibration;
e: Data transmission and coordinate exchange accuracy;
f. Adjust the detection threshold under the specified false alarm rate conditions. 4.3 Guarantee of the technical status of the radar under test during the test 4.3.1 After the radar under test is handed over, the test host of the test unit is responsible for organizing and implementing the test work of the radar. 4.3.2 During the entire test process, the storage, use, operation, maintenance and various records of the radar shall be organized by the test host. Without the consent of the test host, no one shall arbitrarily change or adjust the working status of the radar under test. 4.3.3 Before and after each test, the relevant technical parameters and working status of the radar under test shall be checked and recorded. 4.3.4 During the test, the maintenance of the radar under test shall be carried out in accordance with the relevant provisions of the instruction manual of the radar under test provided by the contractor.
4.3.5 During the test, the faults of the radar under test and their inspection and elimination shall be recorded in detail. 4.3.6 After the components, devices and parts of the radar under test are damaged or fail, they can be replaced only after the consent of the test host. After replacement and adjustment, the relevant technical parameters shall be retested. 4.4 Tested radar site
4.4.1 The test site of the radar under test shall meet the line of sight conditions. During the test, it shall generally be sunny and the wind speed shall not exceed three HYTKAONTKAca-
SI 20664 1998
4.4.2 The test site shall be equipped with necessary test instruments, devices and facilities, and have good grounding measures. 4.4.3 The test site shall not have electromagnetic radiation that interferes with the tactical performance test of the radar under test. 4.5 Requirements for test equipment and instruments
4.5.1 Test equipment and instruments shall comply with product specifications. Homemade equipment must be identified and calibrated regularly by the metrology department and have a valid certificate of use issued by the metrology department. 4.5.2 Test equipment and instruments must meet the specified accuracy. Unless otherwise specified, their accuracy should be better than one-third of the allowable error of the parameters of the radar being tested.
4.6 Requirements for operators
The operator of the radar being tested shall be dispatched by the test contractor and shall receive professional operation training. Skilled in operating the radar under test 4.7 Interruption test
In case of any of the following situations, the test plan shall be stopped and the test shall be interrupted after the test party reports to the competent department for approval:
a. Any tactical indicator in the test fails to meet the requirements, and it is difficult to find the source under the test site conditions, which affects the continuation of other projects;
b. The radar under test has a fault that is difficult to repair under the test site conditions. 4.8 Re-test
When the cause of the interruption test has been found out and the conditions for re-testing are met, the test shall be restarted after approval by the competent department.
4.9 Test records and test reports
4.9.1 Original data
Relevant original data must be collected and recorded in detail during the test. Mainly including: a. Target parameters, test task book, test outline, test implementation plan; b. Inspection records of the main technical parameters of the tested radar and calibration records of various parameters; c. Records of the work, maintenance, failure, etc. of the tested radar; d. Test records of the tactical performance of the tested radar. 4.9.2 Test report
After the test of the tested radar is completed, the tester shall promptly provide the competent department with a test report of the tested radar. The report shall include the following contents:
a. The basis of the test, task number, tester, start and end time, on-site working days, code of the tested radar, nature of the task, and purpose;
b. Technical status of the tested radar, problems found and treatment, instruments and equipment used in the test; c. Summary of test results and main data;
d. Conclusion;
e. Main problems and improvement suggestions for the tested radar. 5 Detailed requirements
The tactical performance test methods to be achieved shall be carried out in accordance with methods 101 to 115 specified in this chapter. Equivalent methods may also be used. 13
SI 20664 — 1998
However, in case of dispute, the method specified in this standard shall prevail. Method 101
Radar detection range test method
1. Purpose
To test the detection range of the radar under test to the target: 2 Requirements
2.1 Test method for air vehicle detection range For the test method of radars with air vehicle detection range requirements, refer to the relevant chapters and clauses of GB74.11 and specify it in the product specification.
2.2 Test method for detection distance of ground moving targets 2.2.1 Radar detection distance test should be carried out at the working frequency specified in the product specification. 2.2.2 Test parameters should be in accordance with the following requirements:
2.2.2.1 Test target
The target selected during the test should be in accordance with the product specification. If it is not clearly specified, it should be selected from the following national standards: a. Armored vehicles and trucks;
b. Single soldier (fully armed).
2.2.2.2 Target movement speed
a. Armored vehicles and trucks: 20~60km/h;
b. Single soldier: 3.5~5km/h.
2.2.2.3 Range of target movement
0.9Rmax≤R≤1.1Rmax-
Wherein: Rmax —
Maximum detection range of the radar under test, kml;
R The distance between the target and the radar, kmlo
2.2.2.4 Target movement form
The test target moves in radial, straight line, hook speed and reciprocating motion close to the radar under test (near) and away from the radar under test (far).
2.2.3 Installation of the radar under test
The position of the radar under test should have a certain height H relative to the test target. The theoretical value is calculated according to formula (2): H1> (R/4.1)2 -2 (R/4.1) VH, + H2 Where: H is the height of the radar under test, m;
H2 is the height of the test target (equivalent reflection center), m; the distance between the radar under test and the test target, mo. In actual operation, the installation height of the radar under test can be selected according to Table 4
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Observation quotient
Maximum horizontal observation distance
Observation height H
Maximum horizontal observation distance
SJ 20664 - 1998
Effect of earth surface curvature on horizontal observation distance Table 1
Note: In Table 1, H,=0 Atmospheric refraction is not considered. 3 Test procedures
3.1 Test procedures for air vehicles
Carry out in accordance with the test procedures of GJB74.11. 3.2 Test procedures for ground moving targets
3.2.1 Interval of distance sampling
Continued from Table 1
Use Nth of the length of the target area as the length of the distance sampling interval, and W should not be less than 5. Adjacent distance sampling intervals should overlap by half.
3.2.2 Number of searches for targets
Search for moving targets at least 10 times in each distance sampling interval. 3.2.3 Movement status of the sun beacon
The target moves along the determined route, and goes back and forth no less than 5 times. 3.2.4 Recording
Every time the antenna beam of the radar under test sweeps over the moving target, the data is recorded once. A found target is recorded as "+", and an unfound target is recorded as "_".
3.2.5 Test record form
See Appendix A (reference) Table A1 and Table A2.3.2.6 Calculation of test results
3.2.6.1 Separately count the nearby and distant sampling data, and calculate the detection probability at the center of the sampling interval according to the following formula: Pi= Mi/Ni
Where: Pi is the probability of detecting the target at the center of the ith distance sampling interval; i is the number of points detecting the target in the ith distance sampling interval; Ni is the total number of points detecting the target in the ith distance sampling interval. (3)
3.2.6.2 With distance as the horizontal axis and detection probability as the vertical axis, draw the relationship curves between the detection probability and distance for the near and far detection according to the detection probability calculated by formula (3). Find the distance corresponding to the detection probability specified in the product specification, which is the obtained detection distance for the near and far detection. 5
1 Purpose
SJ 20664 — 1998
Method 102
Test method for temporary minimum detection distance
Test the closest distance at which the radar under test can detect the target. 2 Requirements
2.1 Test field requirements
Same as 4.4 in Chapter 4 General requirements 2.2 Test target parameters
2.2.1 Test target
The test target is a corner reflector with an effective reflection area equivalent to 10m, 1.5 to 2m above the ground. 2.2.2 Target movement speed
The speed of the test target movement should be within the range specified in the product specifications. 2.2.3 Test target movement form
The test target moves radially, linearly, at a constant speed, and back and forth with respect to the radar under test and away from it. 3 Test level
3.1 Let the test target move from the far end to the radar under test. 3.2 The radar under test observes the target approaching from the far end until it can no longer observe the target, and records the target distance R. 3.3 Let the test target move from a distance less than R away from the radar under test along the route of 3.2 until the target is observed and the distance R of the target is recorded.
3.4 Repeat the procedures of 3.2 and 3.3 10 times each. 3.5 Test record
The test record table is shown in Table A3 of Appendix A.
4 Data processing
Take the average value of each test as the test result, and the formula is as follows: Rmin = 1/n
Wherein: Rmin — minimum effective distance, km;R,i+ Rei
R,i-\ minimum detection distance of the first close target measurement, km;Rzi-minimum detection distance of the ith distant target measurement, km;n total number of close or distant measurements.
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↑Purpose
Test the detection accuracy of the radar under test.
2 Requirements
2.1 Test method for radar accuracy of airborne aircraft SJ 20664 — 1998
Method 103
Radar accuracy test method
For radar accuracy test methods with requirements for airborne aircraft detection accuracy, refer to the relevant chapters of GJB74.11 in the product specification.
2.2 Test method for radar detection accuracy of ground moving targets 2.2.1 Test site requirements
Same as 4.4 of Chapter 4 General Requirements
2.2.2 Test target requirements
Select the target according to the product specification. If there is no clear provision, the recommended test target is a truck. 2.2.3 Test ear tag speed
Select the test target movement speed according to the product specification. If there is no clear stipulation, the recommended speed of the test target is 30~60km/h
2.2.4 Test target movement form
The test target movement route is a straight line with a radial angle of about 30° to the measured radar; uniform speed, reciprocating movement 2.2.5 Test target true value determination
Set 5~10 fixed marking points on the test target movement route. These marking points are accurately measured relative to the coordinate values (azimuth and distance) to be measured, and their errors are less than 1m in distance and less than 0.03° in azimuth. The distance between the marking points is 0.5~1km, and the distance between the marking points and the radar should be in accordance with the product specifications. If there is no clear stipulation, it can be selected at 2~7km.
2.2.6 Setting up the radar under test
After the radar under test enters the test site, it is set up according to the product specification requirements. 3 Test procedure
3.1 The test target moves along the selected route close to and far from the radar under test, and moves back and forth 15 times each. 3.2 When the test target passes through the mark point, record the coordinate value of the target tracked or reported by the radar under test. The recording format is shown in Table A4 of Appendix A (reference).
3.3 It can also be carried out according to the procedures specified in the product specification. 4 Data processing
SI 20664 — 1998
According to the test target close to and far from the radar under test, the measured values are respectively counted, and the detection power and distance error of the radar under test are calculated according to formulas (1), (2) and (3). 4.1 Calculation of System Error
For radars with system error requirements, the system error is calculated according to the following formula: Ni(Ai-Aio)
Mt=
Where: Mt is the total system error, m or (o); (1)
Ai is the arithmetic mean of Ni target measurement values with the same coordinate parameter at the ith mark point, m or (\); Aio is the true value of the same coordinate parameter at the ith mark point, m or (); Ni is the total number of target measurements at the ith mark point; - the number of fixed mark points.
4.2 Random error
4.2.1 Calculate the random error of the target at the marked point according to the following formula: Ei=0.6745,
Where: Ei-the random error of the i-th point, m or (\); Edi+Zdi
d,i-the difference between the coordinate value measured when the i-th point reading increases and the arithmetic mean, m or (); di-the difference between the coordinate value measured when the i-th point reading decreases and the arithmetic mean, m or (); Ni-the total number of measurements at the i-th point.
4.2.2 Calculate the total random error according to the following formula:
Where: Etotal-the total random error, m or (\); Ei-the random error of the i-th point, m or (); Ni-the total number of measurements at the i-th point.
Note: In formulas (1), (2), and (3), the unit of distance error is II, and the unit of azimuth error is (°). Method 104
Jiuda Range Resolution Test Method
1 Purpose
To test the range resolution capability of the radar under test. (2)
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2 Requirements
2.1 Test Target
SJ 20664 -- 1998
Select the target according to the product specification. If there is no clear provision, two radially continuously shaking corner reflectors are selected as the test first targets.
2.2 Test target speed
The test target speed is 2~5km/h
3 Test procedure
3.1 Set two test targets No. 1 and No. 2 at the same location 2~5km away from the tested radar in radial direction. 3.2 After the tested radar searches for the test target, make the No. 1 test target move along the radar radial direction until the tested radar can just distinguish the two test targets, then make the No. 1 test target stop moving. 3.3 Measure the true value of the distance between the No. 1 and No. 2 test targets (△Ri, unit m). 3.4 Make the No. 1 test target continue to move in the original direction for more than 100m, and then make the No. 1 test target move along the tested radar radial direction towards the No. 2 test target. Until the tested radar can just not distinguish the two test targets, make the No. 1 test target stop moving.
3.5 Measure the true value of the distance between the No. 1 and No. 2 test targets (△Rzi, unit m). 3.6 Make test target No. 1 continue to move along the original direction, while test target No. 2 moves, so that it completely overlaps with test target No. 2. 3.7 Repeat the procedures of 3.2 to 3.6 for no less than 10 times. 3.8 Record the measured data. See Appendix A Table A5 for the record form. 4 Data processing
Take the arithmetic mean of the test data of each test as the test result. Method 105
Test method for radar angle (azimuth) resolution 1 Purpose
Test the angle (azimuth) resolution of the radar under test. 2 Requirements
2.1 Test target
Select the target according to the product specifications. If there is no clear provision, use two radially shaking corner reflectors as the test targets.
2.2 Test target
The speed of the test target is 3.5~5km/ha
3 Test procedure
SJ 20664 —1998
3.1 Two test targets, No. 1 and No. 2, are set at the same location 2~5km away from the tested radar in radial direction. 3.2 After the tested radar searches for the test target, the No. 1 test target is moved along the tangent direction of the tested radar until the tested radar just distinguishes the two test targets, and then the No. 1 test target stops moving. 3.3 Measure the true value of the angle between No. 1 and No. 2 test targets relative to the tested radar, A6,i, in units of (\)1. 3.4 Let the No. 1 test target continue to move in the original direction for more than 50m, and then let the No. 1 test target move along the tangent direction of the tested radar towards the No. 2 test target until the tested radar just cannot distinguish the two test targets, and then let the No. 1 test target stop moving.
3.5 Measure the true value of the angle between test targets No. 1 and No. 2 relative to the radar under test [△62i, unit (°)]. 3.6 Let test target No. 1 continue to move in the direction of 3.4 until it coincides with test target No. 2. 3.7 Repeat the procedures of 3.2 to 3.6 for no less than 10 times. 3.8 Record the measured data. The recording format is shown in Table A5 of Appendix A. 4 Data processing
Take the arithmetic mean of the test data of each test as the test result. Method 106
Test method for anti-ground clutter interference
1 Purpose
To test the ability of the radar under test to resist ground clutter interference, and to test the improvement factor and speed response characteristics. 2 Requirements
2.1 Working state of the radar under test
The working state of the radar under test shall be set according to the product specifications. 2.2 Requirements for ground clutter
2.2.1 The ground clutter should be within the range of the radar under test. 2.2.2 The ground clutter intensity should be within the linear dynamic range of the radar receiver under test and not less than the value of the moving target improvement factor. 2.2.3 The ground clutter should be independent and stable. 2.2.4 The ground clutter can be the radar echo reflected by natural objects or simulated objects (including corner reflectors), or the radar wave reflected by natural objects and simulated objects. 2.3 Requirements for the test environment
HTKAONTKAca-2 Test target speed
The test target speed is 2~5km/h
3 Test procedure
3.1 Set two test targets No. 1 and No. 2 at the same location 2~5km away from the tested radar in radial direction. 3.2 After the tested radar searches for the test target, make the No. 1 test target move along the radar radial direction until the tested radar can just distinguish the two test targets, then make the No. 1 test target stop moving. 3.3 Measure the true value of the distance between the No. 1 and No. 2 test targets (△Ri, unit m). 3.4 Make the No. 1 test target continue to move in the original direction for more than 100m, and then make the No. 1 test target move along the tested radar radial direction towards the No. 2 test target. Until the tested radar can just not distinguish the two test targets, make the No. 1 test target stop moving.
3.5 Measure the true value of the distance between the No. 1 and No. 2 test targets (△Rzi, unit m). 3.6 Make test target No. 1 continue to move along the original direction, while test target No. 2 moves, so that it completely overlaps with test target No. 2. 3.7 Repeat the procedures of 3.2 to 3.6 for no less than 10 times. 3.8 Record the measured data. See Appendix A Table A5 for the record form. 4 Data processing
Take the arithmetic mean of the test data of each test as the test result. Method 105
Test method for radar angle (azimuth) resolution 1 Purpose
Test the angle (azimuth) resolution of the radar under test. 2 Requirements
2.1 Test target
Select the target according to the product specifications. If there is no clear provision, use two radially shaking corner reflectors as the test targets.
2.2 Test target
The speed of the test target is 3.5~5km/ha
3 Test procedure
SJ 20664 —1998
3.1 Two test targets, No. 1 and No. 2, are set at the same location 2~5km away from the tested radar in radial direction. 3.2 After the tested radar searches for the test target, the No. 1 test target is moved along the tangent direction of the tested radar until the tested radar just distinguishes the two test targets, and then the No. 1 test target stops moving. 3.3 Measure the true value of the angle between No. 1 and No. 2 test targets relative to the tested radar, A6,i, in units of (\)1. 3.4 Let the No. 1 test target continue to move in the original direction for more than 50m, and then let the No. 1 test target move along the tangent direction of the tested radar towards the No. 2 test target until the tested radar just cannot distinguish the two test targets, and then let the No. 1 test target stop moving.
3.5 Measure the true value of the angle between test targets No. 1 and No. 2 relative to the radar under test [△62i, unit (°)]. 3.6 Let test target No. 1 continue to move in the direction of 3.4 until it coincides with test target No. 2. 3.7 Repeat the procedures of 3.2 to 3.6 for no less than 10 times. 3.8 Record the measured data. The recording format is shown in Table A5 of Appendix A. 4 Data processing
Take the arithmetic mean of the test data of each test as the test result. Method 106
Test method for anti-ground clutter interference
1 Purpose
To test the ability of the radar under test to resist ground clutter interference, and to test the improvement factor and speed response characteristics. 2 Requirements
2.1 Working state of the radar under test
The working state of the radar under test shall be set according to the product specifications. 2.2 Requirements for ground clutterwwW.bzxz.Net
2.2.1 The ground clutter should be within the range of the radar under test. 2.2.2 The ground clutter intensity should be within the linear dynamic range of the radar receiver under test and not less than the value of the moving target improvement factor. 2.2.3 The ground clutter should be independent and stable. 2.2.4 The ground clutter can be the radar echo reflected by natural objects or simulated objects (including corner reflectors), or the radar wave reflected by natural objects and simulated objects. 2.3 Requirements for the test environment
HTKAONTKAca-2 Test target speed
The test target speed is 2~5km/h
3 Test procedure
3.1 Set two test targets No. 1 and No. 2 at the same location 2~5km away from the tested radar in radial direction. 3.2 After the tested radar searches for the test target, make the No. 1 test target move along the radar radial direction until the tested radar can just distinguish the two test targets, then make the No. 1 test target stop moving. 3.3 Measure the true value of the distance between the No. 1 and No. 2 test targets (△Ri, unit m). 3.4 Make the No. 1 test target continue to move in the original direction for more than 100m, and then make the No. 1 test target move along the tested radar radial direction towards the No. 2 test target. Until the tested radar can just not distinguish the two test targets, make the No. 1 test target stop moving.
3.5 Measure the true value of the distance between the No. 1 and No. 2 test targets (△Rzi, unit m). 3.6 Make test target No. 1 continue to move along the original direction, while test target No. 2 moves, so that it completely overlaps with test target No. 2. 3.7 Repeat the procedures of 3.2 to 3.6 for no less than 10 times. 3.8 Record the measured data. See Appendix A Table A5 for the record form. 4 Data processing
Take the arithmetic mean of the test data of each test as the test result. Method 105
Test method for radar angle (azimuth) resolution 1 Purpose
Test the angle (azimuth) resolution of the radar under test. 2 Requirements
2.1 Test target
Select the target according to the product specifications. If there is no clear provision, use two radially shaking corner reflectors as the test targets.
2.2 Test target
The speed of the test target is 3.5~5km/ha
3 Test procedure
SJ 20664 —1998
3.1 Two test targets, No. 1 and No. 2, are set at the same location 2~5km away from the tested radar in radial direction. 3.2 After the tested radar searches for the test target, the No. 1 test target is moved along the tangent direction of the tested radar until the tested radar just distinguishes the two test targets, and then the No. 1 test target stops moving. 3.3 Measure the true value of the angle between No. 1 and No. 2 test targets relative to the tested radar, A6,i, in units of (\)1. 3.4 Let the No. 1 test target continue to move in the original direction for more than 50m, and then let the No. 1 test target move along the tangent direction of the tested radar towards the No. 2 test target until the tested radar just cannot distinguish the two test targets, and then let the No. 1 test target stop moving.
3.5 Measure the true value of the angle between test targets No. 1 and No. 2 relative to the radar under test [△62i, unit (°)]. 3.6 Let test target No. 1 continue to move in the direction of 3.4 until it coincides with test target No. 2. 3.7 Repeat the procedures of 3.2 to 3.6 for no less than 10 times. 3.8 Record the measured data. The recording format is shown in Table A5 of Appendix A. 4 Data processing
Take the arithmetic mean of the test data of each test as the test result. Method 106
Test method for anti-ground clutter interference
1 Purpose
To test the ability of the radar under test to resist ground clutter interference, and to test the improvement factor and speed response characteristics. 2 Requirements
2.1 Working state of the radar under test
The working state of the radar under test shall be set according to the product specifications. 2.2 Requirements for ground clutter
2.2.1 The ground clutter should be within the range of the radar under test. 2.2.2 The ground clutter intensity should be within the linear dynamic range of the radar receiver under test and not less than the value of the moving target improvement factor. 2.2.3 The ground clutter should be independent and stable. 2.2.4 The ground clutter can be the radar echo reflected by natural objects or simulated objects (including corner reflectors), or the radar wave reflected by natural objects and simulated objects. 2.3 Requirements for the test environment
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