A Retransmission Spoofing Signal Detection Algorithm Based On Multiple Correlation Peaks For BOC Modulation Receiver

Because of its vulnerability,the satellite navigation signal is highly susceptible to all kinds of malicious interference.Among of all these interferences,retransmission GNSS(Global Navigation Satellite System)spoofing is becoming an important means for the military agencies to interfere with the enemy because of its strong concealment and harmfulness.As satellite navigation systems begin to use BOC modulation signals,how to detect the retransmission GNSS spoofing interference under the circumstance of "navigation warfare" and ensure the satellite navigation system to provide safe and reliable service has become a hotspot in the field of satellite navigation.On that basis,this paper has done the following work:(1)For the BOC modulation,the spurious interference-related peak characteristics are analyzed,and the mathematic model of the retransmission GNSS spoofing and the model of the receiver capture are established.The Fourier transform of the power spectral density is used to derive the real signal and GNSS spoofing coexistence,the influence of GNSS spoofing on the waveform of autocorrelation function of real signal is analyzed in detail by using numerical analysis method.The GNSS spoofing model is divided into large delay and small delay with the distortion of the peak of correlation of the real signal as the standard,which paves the way for the next step of research.(2)Aiming at the shortcomings of multi-peak detection algorithm in traditional BOC modulation and deception jamming phase,this paper proposes a multi-peak and power cooperative detection algorithm,which not only can detect GNSS spoofing,but also determine the correlation peak.In addition to these,the proposed algorithm can roughly estimates the parameters of GNSS spoofing,and provides technical support for anti-GNSS spoofing.(3)A novel symmetric detection algorithm based on the symmetry of BOC modulation signal is proposed to solve the problem of GNSS spoofing in BOC modulation and acquisition phase which set on the base of the characters of correlation peaks.The detection model of GNSS spoofing is constructed by using the quadrature peak-squared difference cumulant of the correlation peak.In order to solve the problem of GNSS spoofing detection in the tracking phase,a delay detection algorithm based on reconstruction and cancellation is proposed.According to the difference of the delay difference between the tracking and GNSS spoofing reconstructing,the algorithm can ensure that the receiver is correctly timing the result.In the end,the main research work of the paper is summarized,and the work to be carried out in the next step is forecasted.