Satellite navigation signal authentication method

The invention provides a satellite navigation signal authentication method. The method comprises the following steps: selecting a cyclic shift sequence code with a relatively low autocorrelation peak value as an authentication code; representing authentication information needing to be transmitted by using the authentication code subjected to cyclic shift, and performing phase modulation processing of multiple code shift keying combination on the authentication information; and adding the authentication information subjected to phase modulation processing of the multiple code shift keying combination at a fixed position of the satellite intermediate frequency signal navigation message. The method provided by the invention can effectively solve the problem that the civil GNSS signal broadcasting process is susceptible to deception and interference, improves the authentication information transmission rate of the transmitting end and the accuracy of information decoding of the user receiving end, has the advant