Due to the existing global navigation satellite system (GNSS) is an open, without certification system, satellite receiver is vulnerable to the potential for fraud. Therefore, it is urgent to solve the security certification problem of GNSS civil signals. Aiming at the above problems, this paper proposes a navigation encryption authentication technology based on modulation Method authentication (MMA) based on UBFH-BOC signal system. The results show that the authentication scheme can effectively resist the threat of spoofing, ensure the security of navigation signal transmission, and provide a reference for the subsequent application of high security navigation signal structure.