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General specifications for satellite tracking and orbit satellite-borne system
1 Subject content and application scope
This standard specifies the technical requirements, test methods, inspection rules, as well as marking, packaging, transportation and storage of satellite tracking and orbit satellite-borne system (hereafter referred to as “tracking system”).
This standard is applicable to the development, production, test and inspection of satellite tracking and orbit satellite-borne system, and may be serve as a reference for other spacecrafts.
2 Normative references
GJB 145 Military specification preservation packaging method
GJB 151.3 Requirements for equipments and subsystems installed aboard spacecraft and launch vehicles, including associated support equipment (Class A2)
GJB 152 Measurement of electromagnetic emission and susceptibility for military equipment and subsystems
QJ 165 General specifications for installation of aerospace electronic and electrical products
QJ 548 General specifications for manufacturing and mechanical assembly of electronic products
QJ 628 Technical specifications for electronic instrument packing boxes
QJ 1903 General specifications for electrical connectors
QJ 1508 Test methods for electrical connectors
QJ 786 Technical specifications for screening semiconductor integrated circuits
QJ 787 Technical specifications for screening semiconductor discrete devices
QJ 788 Technical specifications for screening tantalum electrolytic capacitors
QJ 789 Technical specifications for screening sealed electromagnetic relay
QJ 909 General specifications for on-board electronic equipment
QJ 931 Specifications for control of superfluous objects in electronic products
QJ 1176 Environmental test requirements for satellites
QJ 1239 Environmental test conditions and methods for electronic equipment
QJ 1291 Test methods for satellite antenna
QJ 1417 Reliability parts derating criteria
QJ 1589 Reliability growth test
SJ 2064 Reliability verification test for electronic equipment (statistical test plan)
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3 Technical requirements
3.1 General requirements
3.1.1 Appearance and structure
The external plating, thermal control coating, color, mark and electrical connector of tracking system equipment (hereinafter referred to as "equipment") must meet the requirements of special technical specifications. The external surface is free from scratches, nicks, cracks, pollution and other mechanical damage.
Overall dimension, installation dimension and mass of equipment shall meet the requirements of special technical specifications.
3.1.2 Electronic components
3.1.2.1 The electronic components adopted shall be selected according to special technical specifications, and strictly screened according to QJ 786~QJ 789 and relevant special technical specifications.
3.1.2.2 The technical requirements for electronic connectors shall comply with QJ 1903 and be tested according to QJ 1508.
3.1.2.3 The derating of electronic components shall comply with QJ 1417.
3.1.3 Manufacturing process
3.1.3.1 The manufacturing and mechanical assembly of various parts shall comply with QJ 548.
3.1.3.2 The electrical installation shall comply with QJ 165.
3.1.3.3 In the process of manufacturing and assembling, the superfluous objects shall be strictly controlled according to the requirements of QJ 931.
3.1.4 Environmental adaptability
3.1.4.1 The environmental adaptability of tracking system is the same as that of the complete satellite.
3.1.4.2 The environmental adaptability test of equipment is classified into environment test during appraisal inspection and environment test during delivery inspection. See Table 1 for environment test items and requirements during appraisal inspection, and Table 2 for those during delivery inspection.
Table 1
S.N. Test item Technical requirements
1 Ground temperature environment test QJ 1176, 4.3.1
2 Ground humidity environment test QJ 1176, 4.3.2
3 Random vibration test QJ 1176, 4.3.4
4 Sine vibration test QJ 1176, 4.3.5
5 Impulse test QJ 1176, 4.3.6
6 Acceleration test QJ 1176, 4.3.3
7 Thermal vacuum test QJ 1176, 4.3.10
8 Noise test QJ 1176, 4.3.7
9 Vacuum discharge test QJ 1176, 4.3.8
10 Temperature cycle test QJ 1176, 4.3.11
11 Leakage detecting test QJ 1176, 4.3.13
Table 2
S.N. Test item Technical requirements
1 Leakage detecting test QJ 1176, 5.3.6
2 Random vibration test QJ 1176, 5.3.1
3 Temperature cycle test QJ 1176, 5.3.4
4 Thermal vacuum test QJ 1176, 5.3.3
3.1.5 Aging
3.1.5.1 The aging requirements for tracking system shall comply with special technical specifications.
3.1.5.2 The aging requirements for equipment shall comply with QJ 909, 2.7.
3.1.6 Reliability
The reliability of tracking system and equipment shall comply with special technical specifications.
3.1.7 Electromagnetic compatibility
Generally, the electromagnetic emission and susceptibility requirements for tracking system and equipment shall comply with GJB 151.3. Special requirements shall comply with special technical specifications.
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3.1.8 Docking test of satellite and earth station
The docking test of satellite and earth station (hereinafter referred to as "satellite and earth") shall comply with special technical specifications.
3.2 Frequency band selection
The frequency band of tracking system may be selected from the following three independent frequency bands, i.e. SHF frequency band, UHF1 frequency band and VHF/UHF2 frequency band. See Table 3 for frequency range.
Table 3
Parameter Frequency band
SHF UHF1 VHF/UHF2
Uplink frequency, MHz 5925~6425 2025~2110 560~620
Downlink frequency, MHz 3700~4200 2200~2290 180/480
Number of ranging sidetone signals 4 7 5
Ranging error, m ≤21.2 ≤1.5 ≤35
Frequency of ranging sidetone signal Main ranging sidetone signal, kHz 27.777 100 96
Secondary ranging sidetone signal, Hz 3968.2
283.4
35.4 20000
4000
800
160
32
8 24000
3000
375
46.875
Frequency of channel ranging sidetone signal, kHz 191) 20.0
16.0
16.80
16.16
16.032
16.008 Group A2)
96
72
71.625
71.953125
69 Group B
96
95.625
95.953125
72
69
Frequency ratio — 221/240 —
Frequency accuracy ±2×10-5 ±2×10-5 ±5×10-7
Short-term frequency stability3) ≤5×10-9 ≤5×10-9 ≤5×10-10
Input dynamic range of receiver, dB ≥70 ≥60 ≥50
Modulation mode Uplink FM/PM PM FM/PM
Downlink PM PM PM
Note: 1) It refers to subcarrier frequency.
2) Group A is preferred.
3) It refers to second-order stability.
3.3 Electrical performance requirements
3.3.1 Performance parameters
See Table 3 for main performance parameters of tracking system. The receiver sensitivity, output power and antenna technical indicators of the transponder shall comply with special technical specifications.
3.3.2 Operating characteristics
3.3.2.1 Modulation characteristics
3.3.2.1.1 The selection of frequency and number of ranging sidetone signals shall meet those specified in Table 3.
3.3.2.1.2 The ranging sidetone signals shall be phase coherent.
3.3.2.1.3 The uplink modulation index shall meet the requirements of the ratio of signal power to noise power spectral density at the receiver input threshold of the transponder, and the downlink modulation index shall meet the requirements of the ratio of residual carrier signal power to noise power spectral density at the earth station and the requirements of power flux density limit. Wherein,
a. SHF frequency band: the total frequency modulation index of uplink signal to carrier is not greater than 14.4, and the total phase modulation index of downlink signal to carrier is 0.1~1.0rad;
b. UHF1 frequency band: each modulation index of the uplink and downlink signals by a single main ranging sidetone signal or a main ranging sidetone signal plus a primary ranging sidetone signal is 0.1~1.0rad, and the maximum square root of the sum of squares of modulation indexes does not exceed 1.4rad;
c. VHF/UHF2 frequency band: the total phase modulation index of uplink signal to carrier is 0.1~1.2rad, and the frequency modulation index is not greater than 2.0 and adjustable; each phase modulation index of downlink signal to carrier is 0.1~1.0rad, and the maximum square root of the sum of squares of modulation indexes does not exceed 1.4rad.
1 Subject content and application scope
2 Normative references
3 Technical requirements
4 Test methods
5 Inspection rules
6 Marking, packaging, transportation and storage
Additional explanation
