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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