Error Extraction and Compensation Method of Calibration Signal

Abstract

By broadcasting a linear frequency modulation signal (LFM) with a large temporal width and bandwidth, the airborne spaceborne synthetic aperture radar (SAR) achieves high resolution in the range. The chirp signal flowing across the transmitting and receiving links has certain amplitude and phase defects since the actual system is not a perfect system. The effect of pulse compression will be substantially influenced by non-linear phase inaccuracy. System calibration can extract nonlinear errors, perform polynomial fitting on the retrieved errors, and apply amplitude and phase correction to the broadcast signal, thereby improving the chirp signal's pulse compression impact.