Laser Micro-doppler Effect Simulation And Experimental Study

There is a developing interest in the potential application of micro-Doppler effect for target detection and recognition. Laser radar have good application prospects in the detection of micro-Doppler effect for it's high measurement precision and strong anti-interference ability. A mathematical model for the study of micro-Doppler effect in laser radar was built. Simulation for the detection of vibrating target induced micro-Doppler effect was conducted using a software which was designed using VC++. An experimental system for micro-Doppler effect study that was worked on optics waveband was designed and built, some fundamental experiments have been done. The simulated signal and the experimental signal was analyzed using a method of joint time-frequency analysis, through the comparison of several different time-frequency analysis methods, it was shown that the time-frequency image which was gotten by reassigned smoothing pseudo wigner distribution have much ideal time-frequency characteristics, this method is fit for the analysis of micro-Doppler signal induced by target vibration, some features of the vibrating target can be extracted from the time-frequency image, it laid the foundation for the achievement of target recognition. Through the comparison of the simulated signal and the experimental signal in time domain and in time-frequency domain, it was shown that our mathematical model can simulate the vibrating target induced micro-Doppler effect well, moreover, the experimental results are exactly accord with the simulated results, through the comparision of experimental results and simulated results, it confirms the validity of the model.