Research On Single Antenna GNSS Anti-Spoofing Technology Based On Signal Reconstruction

The fragile satellite navigation signal is vulnerable to all kinds of interference,among which the spoofing interference,because of its strong concealment,can control the receiver without the receiver's knowledge and produce the wrong navigation and positioning results,which has a huge security threat to the satellite navigation system.In recent years,there are more and more researches on spoofing at home and abroad.Spoofing becomes more flexible and cheaper.The threat of spoofing is gradually increasing,which affects many areas of people's lives.In order to deal with the threat of spoofing,this paper studies the anti-spoofing algorithm for single antenna civil receiver.The main work of this paper is as follows:Firstly,the influence of spoofing power on the SINR and noise base of received signal is analyzed,the probability model of signal to interference noise ratio acquisition is established,a joint detection method of GNSS spoofing is studied,which combines multi-modal detection and SINR detection,improves the theoretical basis of multi-modal detection,expands the application scope of the algorithm,improves the detection probability,and clarifies the detection blind area.The validity of the algorithm is verified by simulation.Secondly,aiming at meaconing,a new spoofing suppression technique of GNSS based on signal reconstruction is studied.Firstly,the carrier frequency and code phase of spoofing signal are estimated by parameter estimation method,and then the orthogonal projection matrix of spoofing signal subspace is constructed to suppress interference.The simulation results show that this method has a good suppression effect on spoofing and guarantee the receiver to achieve effective positioning in the spoofing environment,the algorithm also has a low computational complexity.Thirdly,the detection algorithm is combined with the suppression algorithm to form a complete receiver anti-spoofing function and carry out simulation experiments.The experimental results show that the anti-spoofing strategy can resist simple spoofing and can be used in single antenna civil receivers.