Research On Micro-motion Feature Extraction Of Moving Target Based On Wideband Radar

With the development of wideband radar technology,the use of wideband radar echo makes the research of moving targets especially high-speed moving target possible.Micro-Doppler is the phenomenon of the radar echo frequency modulation caused by the micro-motion of the high-speed target,which is one of the most important features of target recognition,and widely used in radar target recognition.In this paper,the application background is the spatial target recognition of anti-missile defense system,which has made full use of the high resolution profile characteristics of wide band radar and focused on the micro-feature extraction technology of wide band radar target.The article has researched and simulated the 1-D range profiles motion compensation of wide band radar target.On the basis of time-frequency analysis and the distance-phase analysis,it has analyzed the micro-motion feature extraction technology.The specific contents are as follow:(1)The article analyses the applications and prospects of wide band phased array radar,the 1-D range profiles motion compensation of wide band radar target and micro-motion feature extraction technology of wide band radar target,after referring to related documents.(2)The article researched the echo simulation of wide band radar and the way of modelling target micro-motion.It takes chirp signal as the research object.Based on the principle of pulse compression and the way of superimposing multi-scattering centers echo,it analyses the model of multi-scattering centers high-speed moving target echo.And then it constructs the micro-motion model of precession target.On the basis of simulation and real data,it verifies the echo model of wide band radar and micro-motion model,which is the theory basis of researching motion compensation and micro-motion feature extraction.(3)The article researched the wide band radar echo motion compensation technology.Based on the influence of target speed and band product to the 1-D range profiles,the article simulated the Wide-band radar distributed targets echo model and studied the performance of two motion compensation algorithms based on distance correlation and Keystone transformation it is meaningful for further research and engineering application of target micro-dynamic feature extraction.(4)The article studied wide band radar target micro-motion feature extraction technology.The reason of target Doppler and the representation of Doppler effect in radar detection are analyzed.based on the distance-phase analysis method and algorithm for extraction of flight target micro dynamic period based on STFT,the article constructed the way to micro-motion feature,The results of the simulation model verifies the effectiveness of the algorithm.Based on wide band radar echo analysis,this paper describes the technology and method of target micro-dynamic feature extraction.For space target motion causing broadband radar high resolution imaging range cell migration and broadening of the problems,the motion compensation method based on distance as correlation method,provides the micro feature extraction and effective method for space target micro features in practical translation compensation are analyzed and combed.analysis verified the distance based on time-frequency analysis and phase analysis method of obtaining target micro cycle,provides a reliable reference for target recognition practices...