Research On The Jamming Pattern Of Pulse Compression System Radar

With the increasing complexity of the electromagnetic environment in the electronic battlefield,many electromagnetic equipment cannot work normally due to the influence of the complex electromagnetic environment.In a complex electromagnetic environment,new radar systems often have the characteristics of multiple radiation sources,wide-band range changes,and complex signal modulation forms.In order to effectively cause interference to enemy radars,modern radar jammers need to have a wide processing bandwidth,large dynamic range,high-speed signal processing capabilities and the ability to simultaneously interfere with multiple radars.However,the current research on the jamming technology of pulse compression radar is not yet perfect.Therefore,this article focuses on the problems of radar active jamming technology in complex electromagnetic environment for pulse compression radar,and improves the existing jamming algorithms.Finally,the feasibility is verified by simulation experiments.First,for the LFM signal and the NLFM signal,the simulation analysis of fixed frequency shift interference,step wave frequency shift interference and linear function frequency shift interference is carried out.In response to conventional frequency-shift jamming,when dealing with radars with agile frequency modulation slopes,it is difficult for jammers to measure radar signal parameters in real time,and false target positions will jump and the jamming effect will be lost.The N-order SSC blind frequency shift interference is introduced.The false target generated by spectrum expansion-compression has a good interference effect on the frequency modulation slope agile radar,and the hardware implementation of SSC blind frequency shift interference is optimized by the Cordic algorithm.It reduces the computational complexity and provides a practical basis for the hardware implementation of SSC blind frequency shift interference.Secondly,for the traditional SSC blind frequency shift interference,the order is an integer.In order to achieve accurate position interference,different processing delays need to be adjusted,which has certain limitations in practical applications.The integer-order blind frequency shift technology is improved,and an LFM radar jamming technology based on non-integer-order SSC blind frequency shift is proposed.This technology achieves accurate position interference by changing the order of the SSC blind frequency shift under the condition that the jammer processing delay is unchanged.At the same time,multiple non-integer-order SSC blind frequency shift signals of different orders are superimposed,and the initial phase of the signal is controlled by the Newman sequence to reduce the peak-to-average ratio of the suppressed interference signal,which realizes the intensive suppression of interference with multiple false targets.Thirdly,the intermittent sampling direct retransmission interference and the intermittent sampling delay overlap interference are analyzed.Aiming at the limited distance between the false target group and the target echo signal,the non-integer-order SSC blind frequency shift interference and the intermittent sampling retransmission interference are combined.It has realized the deception false target group at a specific interference distance,and at the same time can deal with the radar with agile frequency modulation slope.Finally,the time sequence of the intermittent sampling delay superimposed interference is analyzed,and the intermittent sampling delay interference parameter is designed.Under the condition of a certain power of the jammer,the amplitude of the main false targets is increased,and the false targets are densely distributed,and the energy utilization rate of the jammer is improved.