导航卫星双基地 SAR 几何优选及实测边坡成像

Space-Surface bistatic SAR based on global navigation satellite system (GNSS-BSAR), as a new type of surface observation method, has significant advantages such as short revisit time, wide coverage, and low system cost. When the ground receiver is close to the target scene, due to the low resolution of GNSS-BSAR, the imaging result of the target scene is mixed with the mirror image on the same equidistance line, and image interpretation and deformation inversion cannot be performed. Performing processing. In view of the above problems, this paper proposes a geometric optimization method for navigation satellite bistatic SAR based on resolution design and equidistant Doppler characteristic analysis. This method performs multi-objective joint optimization of GNSS-BSAR resolution performance and equidistance-Doppler characteristics, on the basis of selected experimental scenes, selects a navigation satellite radiation source that can avoid the phenomenon of mirror image blur, and realizes the optimization of GNSS-BSAR geometric configuration. Based on the above methods, a GNSS-BSAR experiment was designed in the Chongqing slope area, and the measured slope imaging results without mirror blur were successfully obtained, which verifies the effectiveness of the proposed geometry optimization method.