An Imaging Compensation Algorithm for Spaceborne High-Resolution SAR Based on a Continuous Tangent Motion Model

Remote Sensing

卷:8

Zhou Li¹  Ze Yu²  Shusen Wang² 

[1] Beijing Institute of Remote Sensing Information, Beijing 100192, China;

[2] School of Electronics and Information Engineering, BeiHang University, Beijing 100191, China;

关键词: high-resolution imaging;    motion model;    phase compensation;    synthetic aperture radar;   

DOI  :  10.3390/rs8030223

来源: DOAJ

【 摘 要 】

This paper develops a continuous tangent motion model by approximating the relative trajectories between spaceborne Synthetic Aperture Radar (SAR) and its targets during every transmitting period and every receiving period as tangential segments. Compared with existing motion models, including the stop-go model and the continuous rectilinear model, the continuous tangent model is much closer to the actual relative motion. Based on the new motion model, an imaging compensation algorithm is proposed that considers the space-variant property of SAR echoes more fully by introducing three space-variant factors: the time-scaling factor, the transmitting–receiving rate, and the transmitting–receiving constant. As a result, spaceborne SAR imaging with 0.21-meter resolution and wide-swath, up to 15 km × 15 km, is achieved. Simulation results indicate that the novel algorithm provides a superior and more consistent focusing quality across the whole swath compared with existing algorithms based on the stop-go or continuous rectilinear models.

【 授权许可】

Unknown