Design And Analysis Of Chaotic Coded OFDM Radar Signal

In recent years,the radar becomes the important tools for target reconnaissance and detection,tracking and guidance,under the demand of the national defense military and the progress of science and traction drive of technology,it has got a rapid development speed,and new system radar types emerge in endlessly.Radar research concerns of high distance resolution and anti-jamming performance.And they are payed close attention by researchers.In this paper,the chaotic coded OFDM signal has both a good anti-jamming performance and high range resolution at the same time.Chaotic coded OFDM signal is the chaotic sequence coded in the form of phase coded into the orthogonal frequency division multiplexing signal.Chaotic sequence is a seemingly random order,actually determined by the mapping relationship,have better self-correlation and difficult to be broken by enemy.Orthogonal frequency division multiplexing signal,namely OFDM,is more than a multiple carrier frequency signal,each carrier frequency satisfies orthogonality relationship.So OFDM signal has the characteristics of both the multiple carrier frequency of bigger signal synthetic bandwidth and high spectrum efficiency.So then combine two kinds of ideas to design a chaotic coded OFDM signal,which is hard to crack and resistant to interception.This article is about three part: design of chaotic coded OFDM signal,the analysis and processing of chaotic coded OFDM signal and inadequacy of this paper.In the first part,mainly introduce the chaos theory and the basic principle of OFDM signal,and give the final form of the chaotic coded OFDM signal and analysis for its signal correlation,ambiguity function and expatiates the basic concept of PMEPR and its inference,puts forward some methods to improve PMEPR.In the final the parameters of such signals are set.In the second part,mainly introduces the echo processing of chaotic coded OFDM signal,then discuss the low probability of intercept signal features,and anti-jamming ability with simulation,at last introduces chaotic coded OFDM signal analysis of the clutter suppression based on space-time adaptive processing(STAP).In the third part,mainly introduces for the deficiency of this article,and puts forwards some suggestions for the future direction.