星载InSAR立体基线定标方法

A Three-Dimensional Baseline Calibration Method of Spaceborne InSAR

在专用的星载InSAR系统中,基线矢量精度是影响地面高程精度的主要因素之一,对其进行定标能有效提高目定标位的精度。目前,基线定标方法多采用简化的二维平面模型,该模型忽略了顺轨基线分量,导致其定标精度不高。针对此模型存在的不足,提出了一种符合星载InSAR工作特点的立体基线模型,通过建立局部移动坐标系,简化定标参数,优化处理过程。仿真数据处理结果表明,该方法能完成高精度InSAR基线矢量定标,可为星载InSAR系统定标提供支撑。

Accuracy of baseline vector is one of important factors that affect the accuracy of height in spaceborne InSAR. By calibrating the baseline vector can effectively improve target＇s position accuracy, now most baseline calibration methods adopt two-dimensional model. This model ignores along- track baseline, which decrease calibration accuracy. According to working theroy of spaceborne In- SAR, this paper presents a three-dimensional baseline model. By constructing the local moving coordi nate system, the proposed method simplifies parameters and optimizes process in calibration. Results show that the proposed method has practical value and can be used in the calibration of high accuracy baseline vector.