Research On Anti-jamming Technology Of Navigation Based On Array Signal Processing

The Global Positioning System(GPS)is a timing and distance-measuring space intersection fixed-point navigation system that measures the speed,three-dimensional position,and time of a moving vehicle.The navigation information is transmitted by means of radio,and various types and various intensity disturbances are encountered in the transmission process.This makes the research on the anti-jamming technology of the system of great significance.At present,array signal processing is one of the research areas of academia.The article first clarified the research background and significance of the project.The research status and development trend in the airspace,space-time domain and deception jamming domain both at home and abroad are analyzed.The basis of array signal processing is given,and the techniques of countering jamming jamming and deception jamming are studied.Research on suppression of oppressive jamming.Firstly,the mathematical model of broadband LFM interference in the suppression interference is given.Secondly,the basic principles of subspace projection algorithm and power inversion algorithm are given,and the results of two algorithms for suppressing interference before and after the interference of two wideband interferences,one wideband interference,two wideband interferences and three wideband interferences are simulated and verified by computer.The comparison of the signal and the noise-to-noise ratio of the output signal under different input signal-to-noise ratio ratios were compared.Finally,the comparison of the signal-to-interference-to-noise ratios of the two algorithms under different interference pitch angles was compared,and the existence of one broadband was obtained.The performance of the subspace projection algorithm is better than that of the power inversion algorithm.When there are 2 and 3 broadband interferences,the sub-space projection algorithm with low SINR is superior to the power inversion algorithm,and the performance of the power inversion algorithm with high SINR is improved.It is better than the subspace projection algorithm,and with the increase of the interference pitch angle,the performance of the two algorithms gradually decreases,but thesubspace projection algorithm is superior to the power inversion algorithm.Research on deception jamming detection technology based on multi-beam parallel structure.Firstly,the basic principle of Linearly Constrained Minimum Varience(LCMV)algorithm and deception jamming model are given,and a new deception jamming detection method is proposed.The deception jamming detection method based on multi-beam parallel structure is applied.When the LCMV algorithm forms a beam pointing,its pattern itself has a null,and then the deception jamming in the null trap is directly suppressed.However,when the enemy launches the deception jamming,the number of jamming jams emitted by the enemy is not single.so deception interference will enter two or more beams,when there is deception interference into the receiver,there will be two or more correlation peaks in the capture,this method uses a multi-channel parallel structure,that is,each road Using the same algorithm,that is,using the LCMV algorithm to form multi-beam pointing,multi-way parallelism can be used to detect which satellite is being spoofed and which satellite has not been spoofed.Moreover,due to the addition of constraints,the corresponding array anti-jamming degrees of freedom are reduced,multi-channel parallelism can also ensure the amount of interference suppression,and finally the use of computer simulation to verify the feasibility of the method and the more the number of elements of the beam pointing easier form.