摘要：Codes are a fundamental element in any code division multiple access (CDMA) system such as GPS and Galileo, because these codes are the tool that enables a GNSS receiver to distinguish one satellite from another. In spite of their great importance, no great innovations have been made in the world of satellite navigation in this area — not since GPS used the Gold codes for the first time in its L1 C/A signal introduced nearly 30 years ago.
