Table 4 Main BDS GSMC Service Performance Indicators

Service success rate

≥ 95%

Response time

Normally better than 1 min

Terminal transmission power

≤ 10 w

Service capacity

 Uplink

300,000 times/h

 Downlink

200,000 times/h

Maximum length of a single message

560 bit (approximately equivalent to 40 Chinese characters)

Usage constraints and remarks

A user needs to carry out adaptive Doppler compensation, and after the compensation, the frequency offset of the uplink signal arriving at the satellite should be less than 1000 Hz