分布式卫星混合基线SAR-ATI相位校正方法  

A phase correction method for Hybrid Baseline SAR-ATI of Distributed Satellites

作　　者：蔡斌[1] 梁甸农[1] 董臻[1] 

机构地区：[1]国防科技大学电子科学与工程学院,湖南长沙410073

出　　处：《信号处理》2008年第5期747-751,共5页Journal of Signal Processing

摘　　要：本文提出了一种分布式卫星混合基线SAR-ATI相位校正方法。分布式卫星在SAR-ATI工作模式下,由于编队构型、任务需求、地球自转、轨道摄动和卫星姿态变化等诸多因素的影响,卫星之间存在沿航向和切航向的混合基线。卫星间的切航向基线加剧了基线去相关引起的相位随机噪声,使得ATI相位中运动目标相位和地面高程相位混合在一起,造成了大量的虚警,导致动目标检测失败。本文提出了一种新的SAR-ATI混合相位校正方法,较好地抑制了切轨迹干涉相位,改善了SAR-ATI的检测性能。本文基于分布式卫星SAR仿真系统进行了仿真实验,实验结果证明了该方法的良好性能。This paper proposed a phase correction method for hybrid baseline SAR-ATI of distributed satellites. Due to many factors, such as the satellites formation configuration, mission requirement, earth curvature, atmosphere perturbation and attitude change, the distributed satellites in SAR-ATI model include hybrid along-and cross-track baseline. The cross baseline increase the random phase noise of baseline decorrelation, which resulted in high false alarm and detection failure. This paper proposed a new phase correction method which can remove the cross track interferometric phase and noise efficiently, and improve the detection performance of SAR-ATI. Based on the distributed satellites SAR simulation system, the simulation experiments are carried out to verify the effectiveness of the proposed method.

关 键 词：分布式卫星 混合基线 SAR-ATI 相位校正 切航向干涉相位 分布式卫星SAR仿真系统 

分 类 号：TN958[电子电信—信号与信息处理] P631.4[电子电信—信息与通信工程]