Design And Anti-countermeasures Performance Analysis Of Radar Waveform Based On Wavelet Packets

Currently,radar faces with "four threats".In order to deal with these challenges,we not only put all effort on the radar system,but also put forward more and more requirement to radar waveform.We need to have a certain resistance on the basis of guarantee the detection performance.In this paper,we study radar waveform that to describes the anti reconnaissance of radar waveform,anti-interference measures to prevent the target by an enemy radar signal intercept,reconnaissance,and disturbance by non-cooperative receiver and to ensure the smooth progress of our mission.This paper focuses on the radar waveform and designs anti-countermeasures radar waveform and expects to achieve radar countermeasures.The main work of the paper is summarized as follows:1.The analysis of radar reconnaissance system and the composition system and working principle of active jamming system make a list of evaluation index that affects radar waveform against resistance evaluation,introducing the incidence matrix against resistance and establishing evaluation model.In this paper,the anti-resistance of the waveform is numerically calculated and the evaluation value of the radar waveform is given through multiplicative sum.2.The evaluation model is used to analyze the anti reconnaissance performance of radar waveform,and the evaluation values of each evaluation index need to be analyzed one by one.The analytical methods and mathematical tools includes the interception factor?the time-frequency distribution? PRI transform algorithm and the improvement of the SNR are used in this paper.And according to the determination principle of each evaluation index,the score of the evaluation indexes is completed in the end.3.According to the evaluation model based on the correlation matrix,the anti-confrontation capability of several common radar signals is studied,which include LFM signal?NLFM signal?Costas signal and Barker code signal.In this paper,the anti-confrontation performance of these traditional radar waveforms is analyzed and the accuracy and scientificity of the anti-confrontation performance evaluation model based on correlation matrix are verified.4.From radar waveform,The radar waveform is designed based on wavelet packet design.This paper studies how to use the theory of wavelet packet to design radar waveform.From the basic theory of wavelet and wavelet packets,and the analysis of the existing characteristics of the wavelet packet,cascade wavelet packets is presented to construct the radar waveform design method.The anti-countermeasures performance analysis of the radar signal of cascade wavelet packet is completed by using the established anti-confrontation performance evaluation model and the anti-countermeasures evaluation score of this radar waveform is given.