Research Of Space-time Adaptive Anti-jamming Algorithm For Satellite Navigation Receiver

With the rapid development of Global Navigation Satellite Systems(GNSS),it plays an important role in people's lives,providing us with precise position information.The satellite signal is very weak and satellite navigation receivers may suffer from a variety of interference.Therefore,it is of great significance to improve the anti-jamming capability of satellite navigation receivers.This dissertation focuses on the anti-jamming algorithm of the spatial domain and space-time domain of the satellite navigation receiver.Firstly,the principle of satellite navigation signal is analyzed.The spatial array signal model is established,and the power inversion algorithm of satellite navigation receiver is studied.A multi-step iterative Least Mean Square(LMS)algorithm based on power inversion principle is proposed.Secondly,the spatial array model and the time domain array model are jointly processed,and the space-time array model is established.Anti-jamming algorithm based on Linear Constrained Minimum Variance(LCMV)criterion is studied in the article.Different types of interference,different array modes,single linear constraints,multiple linear constraints,etc.in the space-time anti-interference algorithm are completed.The numerical simulation results demonstrate that the space-time domain anti-jamming algorithm is superior to the spatial anti-jamming algorithm,and the suppression effect is better.Finally,for the performance degradation of anti-jamming due to the amplitude-phase error,a robust method for the anti-jamming based on the subspace orthogonal principle using space-time adaptive processing is proposed.Compared with the traditional anti-jamming algorithm,this method can suppress interference more accurately when there is amplitude and phase error in the channel,and improve the robustness of the anti-jamming algorithm.