Abstract:The narrow beam and flat earth hypothesis is a widely used assumption in Synthetic Aperture Radar (SAR) motion compensation. It proposes an approach in dealing with the space variance of the motion errors of the moving platform relative to arbitrary point targets in the scene, which is approximately considered as the space variance of the associated distance of the same range gate in the direction of radar beam center. Based on the narrow beam and flat earth hypothesis, this paper derives an implied conclusion that the optimal direction of motion compensation is perpendicular to the line of sight transmitted from the radar beam center only when the height error exists. This analysis is suitable for both broadside and squinted motion compensation models. Then, the reason of the hypothesis in carrying out motion compensation is presented in detail and its validity is confirmed by means of simulated experiments.
曾乐天, 邢孟道, 陈士超. 基于窄波束和平地假设的运动补偿方向研究[J]. 电子与信息学报, 2014, 36(10): 2464-2468.
Zeng Le-Tian, Xing Meng-Dao, Chen Shi-Chao. The Research on the Direction of Motion Compensation According to the Narrow Beam and Flat Earth Hypothesis. , 2014, 36(10): 2464-2468.