Modeling And Simulation Of Clutter And Jamming For Space-born Radar

Space-borne radar,whose observation platform is satellite,has many advantages,such as wide and long detection range,the capability to avoid attack,all-weather detection and tracking etc.Space-borne radar also play an important role whether in the military or civilian areas,and is one of radar research hostpts.The working environment of space-borne radar is complicated,not only including ground\sea clutter in the big scene range,but also a variety of artificial active,passive and combined jamming.These clutter and jamming seriously affect the work of the spaceborne radar,and put forward higher requirements for the performance of spaceborne radar.It is an effective method to simulate radar performance by simulating the complex working environment.Based on background of the actual project,this thesis just take Space-borne Radar as research object,analyze and model the complex working environment of spaceborne radar.This thesis is divided into three parts,It includes the modeling of spaceborne radar,the modeling of ground / sea clutter,and the modeling of several typical jamming.Firstly,the geometry model of spaceborne radar is analyzed and studied.The satellite orbit is modeled and the orbit of the Low-Orbit Satellite is simulated.In addition,subastral point and wave irradiation area are calculated and simulated.Then,the modeling of ground\sea clutter is studied.In this thesis,algorithm for generating clutter sequence of statistical model is studied,and the simulation of several typical clutter sequences is given.The antenna pattern,clutter scattering coefficient model and region partition are introduced,and the doppler frequency of the earth rotation is introduced briefly.The overall scheme and process of clutter modeling are given.In addition,the clutter modeling method based on DEM data is presented.In the end,some typical jamming environments for spaceborne radar are analyzed.The characteristics of chaff cloud echo is intriduced in this thesis,and according to the time-frequency characteristic,the echo simulation of chaff cloud is made by the method of chaff echo simulation based on its mechanism.The blanking jamming mode and the noise modulation signal are introduced and simulated.The range-gate walkoff and velocity gate walk-off are analyzed and simulated.