Research On Modeling And Simulation For Radar Echo

The Modeling and Simulation of radar signal plays an important role in the design of modern radar system. This paper analyses the statistical model of target echo and clutter received by radar.In the simulation for target echo, First we analyse the mathematical expression for radar target echo on the base of radar equation. Second, presenting three main calculational methods of the deterministic model of Radar Cross Section(RCS), and introducing the calculational formula for some simple object, some average RCS data of familiar objects in microwave band. Meanwhile, the statistical model of RCS—Swerling model are studied and the method to produce the Swerling sequences be given. Third, two algorithms for producing uniform distribution are analysed thoroughly by us—mid-square method and linear congruential method. Through the comparision of the performance of the two algorithms, we select the latter to produce the uniform distribution sequence in (0,1). Fourth, presenting the primary principle of line array and simulating the target echo received by ULA. Fifth, we derive the mathematical equation of the instantaneous DOA, when the target moving in line and in the same plane as ULA.This paper simulates the correlated-coherent radar clutter model. First, presenting the basic theory of zero memoriless nonlinear method and sphere invariable random process method, the different fields where the four amplitude distributions(rayleigh, log-normal, weibull, K) can be applied in. Second, analyzing three algorithms to design shaping filter: AR modele, minimun phase, frequency sampling. After comparing the correlation performance of sequences which are generated in these algorithms separately, we decided to use frequency sampling method has the best performance to design shaping filter. Third, this paper analyse clutter models which submit Gauss power spectrum and forenamed four amplitude distributions. Meanwhile, we introduce the noncentral chi-square gamma distribution that can interpret the physical reason of radar clutter better. Fourth, we simulate different clutter models, the result is useful for practical work.