This standard specifies the general technical requirements, test methods, inspection rules, marking, packaging, transportation, storage, etc. of ground radar transmission systems (hereinafter referred to as transmission systems). This standard applies to ground radar pulse transmission systems, and continuous wave transmission systems can refer to it. SJ 3223-1989 General Technical Conditions for Ground Radar Transmission Systems SJ3223-1989 Standard Download Decompression Password: www.bzxz.net
This standard specifies the general technical requirements, test methods, inspection rules, marking, packaging, transportation, storage, etc. of ground radar transmission systems (hereinafter referred to as transmission systems). This standard applies to ground radar pulse transmission systems, and continuous wave transmission systems can refer to it.

GB 3047.1 Basic dimension series for panels, racks and cabinets
GB 3784 Radar terminology
GJB 74.2 Common terminology for general technical conditions for military ground radar
GJB 74.5 General technical conditions for military ground radar, design and manufacturing requirements
GJB 74.6 General technical conditions for military ground radar, environmental conditions requirements and test methods
GJB 74.14 General technical conditions for military ground radar, marking, packaging, transportation and storage

Ministry of Machinery and Electronics Industry of the People's Republic of China Standard SJ3223-89
General Technical Conditions for Ground Radar Transmitting Systems Issued on February 10, 1989
Implementation on March 1, 1989
The Ministry of Machinery and Electronics Industry of the People's Republic of China issued Ministry of Machinery and Electronics Industry of the People's Republic of China Standard General Technical Conditions for Ground Radar Transmitting Systems Subject Content and Scope of Application
SJ3223--89
This standard specifies the general technical requirements, test methods, inspection rules, marking, packaging, transportation, storage, etc. of ground radar transmitting systems (hereinafter referred to as transmitting systems). This standard applies to ground radar pulse transmission systems. The continuous wave transmission system can refer to the implementation of 2 reference standards
GB3047.1 Basic dimension series of panels, racks and cabinets GB3784, radar terminology
GJB74.2 General technical conditions for military ground radars Common terminology GJB74.5 General technical conditions for military ground radars Design and manufacturing requirements GJB74.6 General technical conditions for military ground radars Environmental conditions requirements and test methods GJB74.14 General technical conditions for military ground radars Marking, packaging, transportation, storage 3 terms
Any terms not specified in this standard The terms and definitions are subject to GJB.74.2 and GB3784. 3.1 Ground radar
Radars that work on the ground in fixed, semi-fixed, mobile, portable and other modes. Ground radars can be divided into: air intelligence radar, gun aiming radar, ground artillery radar, battlefield reconnaissance radar, guidance radar, coastal radar, weather radar, measurement radar, etc. according to their tactical functions. 3.2 Radar transmitting system
All equipment that can generate power RF signals. Radar transmitting systems generally consist of power supplies, pre-adjusters, modulators, oscillators or RF amplifier chains, monitors, etc.
3.3 Transmitting frequency
The operating frequency of the radar transmitter.
3.4 ​​Operating frequency range (operating bandwidth)
The range of variation of the transmitter operating frequency under the condition of meeting the given technical indicators. 3.5 RF pulse envelope
The video pulse envelope after the RF pulse is detected. See Figure 1 Approved by the Ministry of Machinery and Electronics Industry of the People's Republic of China on February 10, 1989 and implemented on March 1, 1989
Pre-beautification oscillation axis
Pulse rise time
SJ3223-89
Pulse width
Top landing
Pulse fall time
Figure 1 Schematic diagram of pulse envelope
3.5.1 Pulse amplitude
The amplitude of the intersection of the pulse top oscillation axis and the pulse rising edge, 3.5.2 Pulse width| |tt||The time interval corresponding to 50% of the pulse amplitude, 3.5.3 The pulse rise time (pulse front time) is the time required for the pulse amplitude to rise from 10% to 90%, 3.5.4 The top drop
The difference between the pulse amplitude and the voltage amplitude at 80% of the pulse width, 3.5.5 The pulse fall time (pulse trailing edge time) is the time required for the pulse amplitude to drop from 90% to 10%, 3.5.6 The upsurge (wave tip)
The first bee of the pulse top oscillation exceeds the maximum value of the pulse amplitude. 3.5.7 The downsurge
The maximum value of the reverse amplitude that appears after the pulse trailing edge reaches zero. 3.5.8 The top oscillation axis
The smooth connection of the top fluctuation center value of the pulse envelope. 3.6 Pulse Front Jitter
The change in the delay of the front edge of the RF pulse envelope (measured in 50% amplitude) output by the transmitting system relative to the front edge of the trigger pulse (measured in 50% amplitude).
3.7 RF Pulse Spectrum
SJ322389
RF pulse spectrum refers to the energy distribution of the RF signal according to the frequency. 3.7.1 Spectrum Width
The difference between the highest frequency and the lowest frequency at the 1/4 power point of the spectrum main lobe amplitude. 3.7.2 Main Lobe Ratio
The ratio of the spectrum main lobe amplitude to the maximum side lobe amplitude. 3.7.3 Spectral purity
The degree to which the frequency components other than the operating frequency and its harmonics approach zero. Spectral purity is usually measured by two parameters: parasitic discrete spectrum and parasitic continuous spectrum. 3.7.3.1 Parasitic discrete spectrum parameters
Power spectrum:
Voltage spectrum:
-10lgAB(dB/Hz)
A=201g△B(dB/Hz)
Where: A. Signal power (voltage) amplitude at the operating frequency in the spectrum; (1)
-The power (voltage) of the maximum parasitic discrete frequency component in a specified area centered on the operating frequency A,
Amplitude:
Bandwidth of the test equipment,
3.7.3.2 Parasitic continuous spectrum parameters
Power spectrum:
Voltage spectrum:
Where: A. Same as formula (1);
—10lgAB(dB/Hz)
-20lgAB(dB/Hz)
A,--—the power (voltage) amplitude of the parasitic continuous spectrum that deviates from the operating frequency by 1kHz: AB---same as formula (1).
Note: 1) If there is an off-center spectrum line here, the spectrum line can be avoided in the direction of the working frequency for measurement. 3.8 Transmitting power
3.8.1 Pulse power
SJ3223--89
The average power during the duration of the transmitting pulse at the output end of the transmitter. 3.8.2 Average powerwww.bzxz.net
The average value of the pulse power in a repetition period. The relationship between the average power and the pulse power is: Where: P, pulse power, W;
Pa average power, W;
f—-pulse repetition frequency, Hz;
—pulse width, 5.
3.9 Frequency stability
Frequency stability refers to the ratio of the change in the transmitter RF frequency to the transmitting frequency within a specified time. 3.9.1 Inter-pulse frequency stability
The ratio of the standard deviation of the average RF frequency of each pulse of the radar transmitting signal to the transmitting frequency f. For N measurement pulses:
--arithmetic mean of sampling frequencies within the nth and kth pulses, n, k=1, 2, 3,......
N--number of measurement pulses, usually not less than 500. 3.9.2 Intra-pulse frequency stability
Ratio of the standard deviation of the maximum frequency variation within the radar transmission signal pulse to the transmission frequency f. For N measurement pulses
[(fmk-To)-
E(fmk -- T.)) . ...()
Where: 7. The arithmetic mean of the sampling frequencies in the first pulse, k=1, 2, 3, mk-the absolute value of the difference between the kth pulse and the maximum sampling frequency; N-the number of measurement pulses, usually not less than 500. 4 Technical requirements
4.1 General requirements
4.1.1 Appearance
SJ3223--89
The appearance, size and weight of the transmitting system should meet the requirements of the radar complete machine. Without affecting the performance of the product, strive to achieve miniaturization, modularization and light weight. 4.1.2 Structure
8, cabinets and plug-in boxes should generally be designed according to GB3047.1. b. In order to facilitate movement and disassembly, the transmitting system should be a detachable structure. Each combination and plug-in box should generally be equipped with a handle, and a lifting hook (ring) should be set when necessary
c. Actively adopt modular design to improve interchangeability. 4.1.3 Heat dissipation
a. Effective heat dissipation measures should be taken for the oscillators, modulators, power supplies and other heat-generating components of the transmission system. b. The transmission system has high power and is prone to heat. The environmental conditions are relatively harsh. Appropriate consideration should be given to the derating of components, especially power devices.
4.1.4 Safety
a. Safety design should be carried out in accordance with the provisions of GJB74.5. b. Effective protective design must be carried out to improve the safety of the system. c. The high-voltage parts of the transmission system should have sufficient space, good sealing, and use high-performance insulating materials to prevent high-voltage discharge.
4.1.5 Insulation resistance
Each extension of the system must have good insulation and sufficient dielectric strength. The insulation resistance between the power transformer, pulse transformer, high-voltage components and connecting cables and the casing should comply with the provisions of Table 1. Table 1
Test bars
Insulation requirements
Normal insulation requirements
High insulation requirements
4.1.6 Protection capability
Normal test atmospheric conditions
Not less than 100
Not less than 1000
Constant damp and hot conditions
Not less than 100
According to the needs, the transmitting system should have the capabilities of cooling and high-power transmission system protection, vacuum device under-vacuum protection, voltage over-protection, internal temperature over-limit protection, and abnormal inflation pressure protection to ensure the safe operation of the system. 4.1.7 Monitoring device
The transmitting system should generally have monitoring devices for the main performance parameters and devices for fault diagnosis, fault isolation, and fault location.
4.2 Main technical parameters
4.2.1 Transmitting frequency
The transmitting frequency should comply with the provisions of the radar product standards (technical conditions) (hereinafter referred to as technical conditions). 4.2.2 Working frequency range
The working frequency range should comply with the provisions of the technical conditions. 4.2.3 RF pulse envelope
SJ3223-89
The characteristics of the radio pulse envelope shall comply with the provisions of the technical conditions. 4.2.4 Pulse front jitter
The pulse front jitter shall comply with the provisions of the technical conditions. 4.2.5 RF pulse spectrum
The characteristics of the RF pulse spectrum shall comply with the provisions of the technical conditions, 4.2.6 Transmit power
The transmit power shall comply with the provisions of the technical conditions
4.2.7 Frequency stability
The inter-pulse and intra-pulse frequency stability shall comply with the provisions of the technical conditions. Continuous working time
Unless otherwise specified in the technical conditions, the continuous working time is generally 8 to 24 hours. 4.4 Environmental conditions requirements
4.4.1 High temperature
The high temperature environmental conditions of the transmitting system shall be selected according to the requirements of the radar system and in Table 2. Table 2 High temperature environment conditions
Radar use location
4.4.2 Low temperature
Working temperature
354050
455055
Storage temperature
556065
556065
Low temperature environment conditions for the transmitting system shall be selected from Table 3 according to the requirements of the radar complete set. Table 3 Low temperature environment conditions
Radar use location
4.4.3 Constant mixed heat
Working temperature
-25-35-40
Constant humid heat environment conditions shall be selected from Table 4 according to the requirements of the radar complete set. Table 4 Constant humid and hot environmental conditions
Radar use location
4.4.4 Shock
Relative humidity (%)
95~-98
Storage temperature
Ambient temperature (C)
The shock environmental conditions of the transmitting system shall be selected from Article 8.1 of GJB74.6 according to the requirements of the radar complete machine. 4.4.5 Vibration
SJ3223--89
The vibration environmental conditions of the transmitting system shall be selected from Article 9.1 of GJB74.6 according to the requirements of the complete machine. 4.4.6 Sports car
The sports car environmental conditions of the transmitting system shall comply with the provisions of Article 10.1 of GJB74.6. 4.4.7 Rain
The rain environmental conditions of the transmitting system shall be selected from Article 14.1 of GJB74.6 according to the requirements of the radar complete machine.
4.5 Reliability and maintainability requirements
4.5.1 Reliability
Mean time between failures (MTBF) is specified by the technical conditions 4.5.2 Maintainability
Maintainability requirements and mean time to repair (MTTR) are specified by the technical conditions. 5 Test methods
5.1 General requirements Test methods
When inspecting general requirements, the technical conditions and relevant documents shall be followed. The inspection results shall comply with the provisions of Article 4.1.
5.2 Main technical parameters Test methods
5.2.1 Transmitting frequency
a Block diagram
The transmission frequency test block diagram is shown in Figure 2. Transmitting system
b. Test
Frequency test equipment
Under the specified conditions, use the frequency test equipment to test the frequency, and the test results shall comply with the provisions of Article 4.2.1.
5.2.2 Operating frequency range (operating bandwidth) Load
Block diagram
Same as Article 5.2.1.
SJ3223-89
Test the highest and lowest operating frequencies while meeting the given technical indicators. Their difference is the operating frequency range (operating bandwidth).
The test results shall comply with the provisions of Article 4.2.2.
5.2.3 RF pulse envelope
a. Block diagram
The RF pulse envelope characteristic test block diagram is shown in Figure 3. Transmitting system
Pulse oscilloscope
Read the pulse envelope characteristic value from the pulse envelope displayed by the oscilloscope, and the test results shall comply with the provisions of Article 4.2.3.
5.2.4 Pulse front edge jitter
8. Block diagram
The block diagram of pulse front edge jitter test is shown in Figure 4. 9
Transmitting system
SJ3223—89
Pulse oscilloscope
From the RF pulse envelope displayed by the oscilloscope, read out the front edge where the pulse amplitude is 50% and the fuzzy band is obviously jittered. The test result should comply with the provisions of Article 4.2.4. 5.2.5 RF pulse spectrum
a: Block diagram
The block diagram of spectrum width, main lobe to side lobe ratio and parasitic discrete spectrum parameter test is shown in Figure 5. Transmitting system
Panoramic spectrum analyzer
The block diagram of parasitic continuous spectrum parameter test is shown in Figure 6. Negative
Transmitting system
Read or calculate the value of each spectrum characteristic
The test result should comply with the provisions of Article 4.2.5. 5.2.6 Transmit power
a. Block diagram
SJ3223-89
Phase noise
Tester
The block diagram of transmit power test is shown in Figure 7. Transmit system
b. Measure the average power value, calculate or directly measure the pulse power. The result shall comply with the provisions of Article 4.2.6.
5.2.7 Frequency stability
a. Block diagram of frequency stability test is shown in Figure 8. Transmitter
Radar frequency stability
Test device
Power measurement equipment
Calibration instrument, test parameters
SJ3223--89
The test results of inter-pulse and intra-pulse frequency stability shall comply with the provisions of Article 4.2.7. 5.3 Continuous working time test method
Under the natural environment conditions of the commissioning site, power on and work according to the use requirements to check whether its main technical parameters are stable within the specified test time and meet the requirements of the technical conditions. 5.4 Environmental test method
The test conditions of the environmental test, the installation of the test sample in the test equipment, the test procedure, the handling of accidental interruptions of the test, the test chamber box), the test records and the test report, etc., shall comply with the provisions of Chapter 3 of GJB74.6. 5.4.1 High temperature
5.4.1.1 High temperature working test and high temperature storage test can be carried out separately or jointly. The test equipment and test procedures shall be carried out in accordance with the provisions of Articles 4.2.3, 4.2.4, 4.2.6, etc. of GJB74.6. 5.4.1.2 High temperature working time shall comply with the technical conditions, and high temperature storage time may refer to Table 3 of GJB74.6.
5.4.1.3 Initial test items and requirements, intermediate test items, requirements and technical parameter tolerances, and final test items and requirements shall comply with the technical conditions. 5.4.2 Low temperature
5.4.2.1 Low temperature storage test and low temperature working test may be conducted separately or jointly. Test equipment and test procedures shall be conducted in accordance with Articles 7.2.3, 7.2.4 and 7.2.6 of GJB74.6. 5.4.2.2 Low temperature working time and low temperature storage time shall comply with the technical conditions. 5.4.23 Initial test items and requirements, intermediate test items, requirements and allowable errors of technical parameters, and final test items and requirements shall comply with the technical conditions. 5.4.3 Steady damp heat
5.4.3.1 The test equipment and test procedures for the steady damp heat test shall comply with the provisions of Articles 6.2.3 and 6.2.4 of GJB74.6.
Initial test items and requirements, intermediate test items, requirements and allowable errors of technical parameters, and final test items 5.4.3.2
Items and requirements shall comply with the technical conditions. Note: During the steady damp heat test, the initial test items and final test items shall include the test of insulation resistance. 5.4.4 Impact
The impact test method of the launch system shall be carried out in accordance with the provisions of Article 8.2 of GJB74.6. 5.4.5.4.6 The test method for the running car of the launch system shall be carried out in accordance with Article 10.2 of GJB74.6. 5.4.7 The test method for the running car of the launch system shall be carried out in accordance with Article 14.2 of GJB74.6. 5.5 The test method for the reliability and maintainability of the launch system shall be carried out in accordance with the method specified in the technical conditions. 11
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