质心误差对分布式InSAR基线确定的影响及消除

发布时间：2018-03-30 10:55

本文选题：卫星质心误差　切入点：分布式InSAR　出处：《遥感学报》2017年04期

【摘要】：高精度星间基线确定是分布式InSAR干涉测量中的关键技术。针对卫星在轨运行期间的质心与地面标校结果不一致问题,仿真分析了星体系x、y、z不同方向1 cm质心误差对InSAR星间基线确定的影响。结果表明:x、y方向的质心误差对基线解算影响很小;z方向的质心误差对基线解算影响显著,使得InSAR基线产品中含有明显的系统误差。提出了两种消除卫星质心误差影响的方法:一是在星载GNSS定轨过程中增加轨道径向的经验加速度予以补偿;二是增加星体系z方向的质心偏差估计。实验结果表明,经两种方法处理后得到的InSAR基线3维误差由8.8 mm分别降至0.13 mm和0.09 mm,98%以上的卫星质心误差影响被消除。
[Abstract]:High-precision inter-satellite baseline determination is a key technique in distributed InSAR interferometry.In view of the inconsistency between the centroid of mass and the ground calibration results during the orbit operation of the satellite, the influence of 1 cm centroid error in different directions of the satellite system on the determination of the inter-satellite baseline of InSAR is simulated and analyzed.The results show that the centroid error in the InSAR direction has a small effect on the baseline solution, and the center of mass error in the z direction has a significant effect on the baseline solution, which leads to the obvious systematic error in the InSAR baseline product.Two methods to eliminate the influence of satellite centroid error are proposed: one is to increase the radial acceleration of orbit in the course of orbit determination of spaceborne GNSS, the other is to increase the estimation of the centroid deviation in z direction of satellite system.The experimental results show that the influence of the satellite centroid error over 0.09 mm / 98% is eliminated when the 3D error of InSAR baseline is reduced from 8.8 mm to 0.13 mm and more than 0.09 mm / 98%, respectively.
【作者单位】：国防科学技术大学理学院;
【基金】：国家自然科学基金(编号:91438202,61573367,61370013)~~
【分类号】：TN958

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