GB/T 39472-2020 in English
VALIDPerformance requirements and test methods for BeiDou navigation satellite system signal record and playback devices
- Issued on:2020-11-19
- Implemented on:2021-03-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
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《GB/T 39472-2020北斗卫星导航系统信号采集回放仪性能要求及测试方法》由TC544（全国北斗卫星导航标准化技术委员会）归口，主管部门为中央军委装备发展部。
Introduction
Standard Framework and Technology Evolution
GB/T 39472-2020 is my country's first national standard specifically for Beidou Satellite Navigation Signal Acquisition and Replay Instrument, marking the entry of Beidou terminal test equipment into a new stage of standardization. This standard is formulated by the Equipment Development Department of the Central Military Commission, and its technical indicators are 30% higher than those of similar international standards, especially the requirement of carrier-to-noise ratio playback consistency ≤2dB, which has reached the international leading level.
Analysis of core performance indicators
| Indicator category | Key technical parameters | Test method |
|---|---|---|
| Signal quality | 3dB bandwidth ≥8MHz In-band flatness ≤2dB | Swept frequency signal analysis method (5.6.2) |
| Dynamic range | Spurious free dynamic range ≥25dB Output power dynamic range ≥30dB | Spectrum analysis method (5.6.3) Step attenuation method (5.6.7) |
| Positioning performance | Pseudorange accuracy ≤ 0.6m Positioning playback consistency ≤ 5m | Double difference processing method (5.6.9) ENU coordinate system conversion method (Appendix A) |
Key technology implementation path
Carrier-to-noise ratio consistency control
The standard requires that the acquisition and playback instrument achieve a carrier-to-noise ratio fluctuation of ≤ 2dB on the signal link, which requires the use of:
- Digital intermediate frequency processing technology to compensate for analog link loss
- Adaptive gain control algorithm (AGC)
- Clock source with phase noise ≤ 0.01rad
Time reference system
Frequency stability requirement is 5×10⁻⁹/s, and requires the following configuration:
- Oven-controlled crystal oscillator (OCXO) or atomic clock
- PLL phase-locked loop synchronization technology
- External 10MHz reference input interface (BNC/SMA)
Key points for test environment construction
Clause 5.2 of the standard stipulates that the test environment must meet the following requirements:
- Temperature control: (23±5)℃±2℃/h
- Humidity≤80%RH
- Equipment accuracy requirements (Table 2):
- Spectrum analyzer frequency deviation≤1×10⁻⁷
- Measurement receiver linearity±0.01dB/10dB
Implementation suggestions
- Equipment selection verification: Focus on checking the SFDR test capability of clause 5.6.3. It is recommended to use the R&S FSW series spectrum analyzer
- Test process optimization: For pseudorange testing (5.6.9), it is recommended to use the multi-constellation joint solution mode
- Data processing: Positioning consistency analysis must include data screening with HDOP≤4 (Appendix A.2a clause)
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