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Table 1 The difference between four major constellation systems

From: Research on multi-constellation GNSS compatible acquisition strategy based on GPU high-performance operation

GNSS signal PRN code length PRN code period (ms) modulation mode PRN code type
GPS L1 C/A 1023 1 BPSK Gold code
Galileo E1B 4092 4 BOC Memory code
GLONASS L1 511 1 BPSK M sequence
Beidou B1I 2046 1 BPSK Gold code
  1. The table shows the difference between the four constellations in terms of the code length, the code rate, the mode of modulation, and the way of code generation of the RPN