GB/T 39413-2020 in English

This standard specifies the technical requirements and test methods for the Beidou satellite navigation system signal simulator (navigation signal simulator), which is applicable to the entire process of equipment development, production and acceptance. The standard systematically defines the simulator's five major functional module architectures and three types of working modes for the first time.

1. Multi-system compatible design

The standard requires the simulator to support at least BDS public service signals. It is recommended to be compatible with GPS L1C/A, GLONASS L1 and other signals. Special attention should be paid to the following:

• Isolation design when B1C (1575.42MHz) overlaps with GPS L1 frequency
• Subcarrier phase consistency control of BOC modulated signal

2. Dynamic scenario simulation

For high dynamic test scenarios (such as missile trajectory), the following must be met:

• Step response capability of acceleration ≥ 900m/s³
• Multipath simulation channel ≥ 4

Phase noise test

The measured value of a certain model simulator at 10Hz offset is -58dBc/Hz (the standard requires ≤-60dBc/Hz), and the standard is met through the following improvements:

1. Upgrade OCXO time-frequency reference module
2. Optimize RF link shielding design
3. Add power supply filter circuit