DME Interference Mitigation Algorithm Based on Signal Separation Estimation Theory for GPS L5

摘要

L5 signal is set up for civil aviation exclusively in GPS (Global Positioning System), and takes up exclusive frequency band. However, the DME (Distance Measurement Equipment) signal which has already applied for distance measurement works as the same frequency band as GPS L5. DME signal with high power will decrease SINR (Signal to Interference and Noise Ratio) of GPS L5 and even give rise to acquisition failure. On DME interference suppression, the traditional methods will bring loss to useful satellite data. Thus the performance of GPS L5 receiver will suffer from serious degradation. In the light of the received signal model, a new DME interference mitigation algorithm is presented in this paper. Firstly, frequency is estimated with time-modulated windowed all-phase DFT (tmwapDFT). Then, we use the estimated frequency to get amplitude and signal delay information with signal separation estimation theory. Compared with traditional method, the proposed method can reserve more useful satellite data. The performance of proposed method is verified by simulations.