3D micro-doppler modeling of SAR wheeled and tracked vehicle  and echo simulation

LUO Yu-feng， CHEN Hua-jie
（Key Laboratory of Fundamental Science for National Defense-Communication Information
Transmission and Fusion Technology， Hangzhou Dianzi University， Hangzhou 310018， China）

Abstract： Echo data of airborne synthetic aperture radar（SAR）is the foundation of airborne SAR signal processing，however the measured data from air trials is expensive and inflexible. Aiming at this problem，a method that can simulate an airborne SAR echoes data of micro moving target in the laboratory was proposed. Firstly，the theoretical model of SAR moving point target echoes data simulation was presented，and the method of 3-D SAR echoes data simulation was proposed. According to the structural characteristics and motion features of wheeled and tracked vehicles，two theoretical models were built and the results of simulation experiments were presented. Then the echo signals of different vehicles with different speeds were compared by using time-frequency analysis. The results indicate that this theoretical model is correct，and which can simulate airborne SAR echo data of micro moving target in laboratory，the micro-doppler characteristics analysis of echo data provides important supple-military conditions for existing target recognition methods.
Key words： synthetic aperture radar（SAR）； moving target； wheeled vehicle； tracked vehicle； micro-doppler； echo simulation