Research On Anti-Spoofing Technology Of Civil Receiver With Single Antenna

With the development of global navigation satellite systems,satellite navigation technology has been deeply applied in social life and military fields,and satellite navigation security has also received increasing attention from all countries.After the navigation signal is attenuated by the distance,the signal power reaching the ground is extremely weak,and the civil signal structure is open,so it is vulnerable to natural interference and man-made malicious interference.Natural interference is inevitable,and man-made malicious interference is extremely harmful.Man-made interference is divided into suppression interference and deception interference.Compared with suppression interference,deception interference is more concealed and user defense is more difficult.The thesis takes GPS system as the research object,and conducts research on antispoofing technology in view of how to improve the deception defense capability of singleantenna civil navigation equipment.This paper conducts research on deception detection from the signal layer and the information layer.Based on the research and analysis of the Doppler consistency detection algorithm and the signal quality detection algorithm,the corresponding improved algorithm is proposed.The main work is summarized as follows:First.Classify and summarize the principle and system structure of deception attacks.On this basis,analyze and study the influence of deception signals on navigation receiver baseband signal processing and positioning solution.At the same time,summarize the principle of anti-spoofing interference and compare the advantages and disadvantages of existing anti-spoofing algorithms.Second.Research on spoofing detection in the information layer,and analyze and study the anti-spoofing algorithm based on Doppler frequency shift consistency.Aiming at the problem that the detection algorithm fails when the spoofing signal meets the Doppler frequency shift consistency,this paper proposes a spoofing detection algorithm based on pseudorange and Doppler residual,and verifies the detection performance of the algorithm through simulation and actual measurement.Third.Research on spoofing detection at the signal layer,and analyze and study the SQM algorithm.Aiming at the problem that the SQM algorithm cannot distinguish between multipath and spoofing signals,and the performance of the algorithm is related to the power of the spoofing signal,this paper proposes a spoofing detection algorithm based on the coherent integral moving variance.The simulation results show that the improved algorithm has a detection probability under the same false alarm rate.Better than SQM algorithm.Finally.The CUDA-based anti-spoofing software receiver baseband processing architecture is designed,and the application verification of the above-mentioned antispoofing algorithm is realized.