The chaotic Direct Sequence Spread Spectrum (DSSS) has become a research focus in the communication field because of its high capacity, low interception rate and excellent security in the physical layer, and it can provide a secure and reliable address code for the satellite navigation system. Although randomness of chaotic sequences can enhance the security of chaotic DSSS signals, traditional chaotic DSSS systems cannot overcome reconstruction and nonlinear prediction of chaotic models by unauthorized users, with the development of blind despreading and chaotic prediction techniques. Therefore, it is very important to study the anti-blind estimation transmission methods of chaotic DSSS signals. To improve the security of chaotic DSSS signals and solve the problem of illegal prediction of unauthorized users, this paper proposes an Anti-blind Estimation Transmission (AET) method for chaotic DSSS signals. By introducing two orthogonal long period PN sequences and using the PN sequence alternating shift to control chaotic system parameters, the chaotic sequence is synchronized according to the correlation peak, so as to achieve the purpose of information transmission. The method proposed can not only ensure efficient transmission of authorized users, but also suppress blind estimation of unauthorized users, reduce probability of illegal reception of unauthorized users, and improve system security. This method can provide theoretical and technical support for high performance transmission of navigation signals.
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