Abstract:

As the laser signal of inverse synthetic aperture imaging LADAR (ISAIL) has high frequency, large bandwidth and short wavelength, conventional range-Doppler can not be used again. This paper analyzes the characteristic of echo signals, finishes time-frequency analysis for the signal after optical heterodyne processing with reassign smoothed pseudo WVD and Radon transform. The velocity of targets is estimated and the echo signal is compensated accurately, and the high resolution two dimensional imaging can be realized. The simulation shows that this method is effective, and the images achieved by the ISAIL system have higher quality than the microwave inverse synthetic radar system.