基于子孔径包络误差校正的SAR高精度运动补偿方法

目前，SAR正在向体积小、重量轻、功耗低的方向发展，由于受气流的影响，微小型SAR平台极易偏离理想航迹，大幅运动误差造成SAR图像质量严重下降，因此在微小型SAR成像处理过程中对运动误差的精确补偿十分重要。运动误差会造成包络误差和相位误差，传统运动补偿算法往往忽略包络误差的空变性，但是当运动误差幅度过大时空变的包络误差会对成像质量造成严重影响。该文提出与频分子孔径运动补偿算法相结合的包络误差校正方法，该方法消除了空变包络误差的影响，从而改善了成像质量。仿真和实测数据处理结果验证了该算法的有效性。 

High-precision Motion Compensation Method Based on the Subaperture Envelope Error Correction for SAR

Small size, light weight, and low power are presently the directions in SAR development. The microSAR platform is small and light, which results in track deviations because of air flow. The large motion error strongly affects the quality of SAR images. Therefore, high-precision motion compensation is important to SAR image processing. Motion error results in phase and envelope errors. Traditional motion compensation algorithms often ignore the space variance of the envelope error. When the motion error is large, the space-variant envelope error affects the image quality. This study proposes a high-precision motion compensation method based on the subaperture envelope error correction for SAR. The proposed method minimizes the effect of the space-variant envelope error and improves the image quality. Simulations and experimental data processing validate the correctness and effectiveness of the proposed algorithm.