Abstract: To solve the problem of navigation message rate limiting the performance of global navigation satellite system (GNSS), a new technology of GNSS signal design based on code shift keying modulation and non-binary low density parity check code is discussed. At a receiving level of -130 dBm and an error rate of no more than 10^-7, the information rate can be up to 1 500 bit/s. Meanwhile, it has the advantages of simple signal structure and strong compatibility with existing GNSS signals. Theoretical analysis and simulation prove that this technology can break through the limit of information rate under the existing GNSS signal system, and overcome the difficulties of acquisition and tracking caused by complex signal structure. Therefore, it has important practical value in GNSS.

Key words: global navigation satellite system, navigation signal, signal structure, code shift keying modulation, non-binary low density parity check code