High resolution airborne SAR motion compensation based on echo data

This paper amply analyzes the airborne SAR motion compensation mechanism on the range compression data and complex image data, and proposes a motion compensation algorithm for the high resolution airborne SAR. This algorithm makes use of the sub-aperture technique to estimate the sub-aperture's Doppler rate with the improved maximum contrast method, and then performs time-domain motion compensation for range compressing data and executes the frequency-domain motion compensation for complex image with PGA method. The raw data imaging result shows that the algorithm can effectively overcome the disadvantage of the scene dependence of the singularity motion compensation algorithm, and improve the SAR image quality.