Research On Anti Deception Jamming Technology Of GNSS Navigation Signal Based On Residual Signal Detection

Because of the satellite is far away from the ground,the strength of the satellite signal has been greatly attenuated when it reaches the ground.At the same time,due to the open structure of the civil signal,the satellite receiver is vulnerable to various interference.Compared with the interference existing in the natural environment,the artificial deception interference has greater harm.Aiming at all kinds of deception jamming,this paper takes the GPS system of GNSS as the research object,and studies the anti deception jamming technology.This paper first introduces the positioning principle of GNSS,then studies and analyzes the principle of a variety of deceptive jamming and the jamming strategies adopted,and makes clear the process of deceptive jamming under different power strategies,and explains the influence of deceptive jamming on the receiver in detail.This paper summarizes the feasible anti deception jamming technology at present and divides the stages of anti deception jamming technology.Then,it analyzes the principle and the existing problems of various technologies in the stage of deception detection and deception elimination.Based on the above analysis and comparison,in the stage of deception detection,residual signal detection technology is selected to detect whether there is deception signal,and the validity of residual signal detection is verified by simulation.In the stage of deception elimination,the defect that the existing method depends on the power of the signal in the judgment of deception signal is pointed out,and the failure caused by this defect is analyzed.This paper proposes an improved technical strategy for power defects,and qualitatively analyzes the effectiveness of the improved anti deception strategy combined with different deception strategies.Based on the application scenario of anti deception interference,the empirical mode decomposition method used in the decomposition processing module is improved,the efficiency of decomposition is improved,and the error caused by the time cost of decomposition module is reduced.The classification method used in the classification decision module is designed to ensure the accuracy of the final selected data.On the basis of the improved anti deception strategy,a complete anti deception interference technology scheme and each module based on residual signal detection are given.The deception signal elimination is shifted from the signal level to the data processing level,which effectively solves the defects of the original anti deception interference technology.