Improved Range Doppler Algorithm Based on Squint FMCW-SAR

Abstract

There is phase distortion in squint Frequency Modulated Continuous Wave Synthetic Aperture Radar (FMCW-SAR), and the phase distortion may affect the imaging process. In this paper, the echo signal model of squint FMCW-SAR is established, and the phase error caused by squint is analysed. Then in this paper, an improved Range-Doppler (RD) imaging algorithm based on FMCW-SAR is proposed from the point of view of real-time processing. The algorithm has the characteristics of small computation and high precision, and is suitable for real-time imaging. Finally, the feasibility and validity of the algorithm are verified by simulation analysis.