Fast Suppression of Time-frequency Cross Wideband Jamming Signal in Satellite Navigation System

Generally, the satellite signal received by the receiver is weakly since its far from the ground, causing the navigation satellite signals are easily to be interfered in the complex space-electromagnetic environment. The interference of the satellite signal is mainly divided into human jamming and environmental jamming. Here, we mainly focuses on the method how to suppress the time-frequency overlapped wideband LFM jamming signal quickly. This article introduces the FrFT method to quickly suppress the LFM broadband jamming signals in the satellite navigation signal. The LFM jamming signal is suppressed in the frequency domain by searching the signal peak in this method quickly. The simulation results show that the method can effectively separate the satellite signal from the jamming signal. Compared with the traditional method, the BER(Bit Error Rate) of the satellite navigation signal after jamming suppression is also lower, which verifies the effectiveness of this method.