星载InSAR系统DEM重建及其误差分析

孙造宇; 梁甸农; 张永胜

doi:10.3724/SP.J.1146.2006.01735

星载InSAR系统DEM重建及其误差分析

doi: 10.3724/SP.J.1146.2006.01735

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出版历程
- 收稿日期: 2006-11-06
- 修回日期: 2007-08-13
- 刊出日期: 2008-06-19

Method and Error Analysis of DEM Reconstruction for Spaceborne InSAR

摘要

摘要: 对于星载干涉合成孔径雷达(InSAR)系统数据处理中的数字高程模型(DEM)重建,其误差受基线误差等误差源及是否采用地面控制点(GCP)影响。该文基于传统重建方法得出了利用GCP时的DEM重建方法,并分析了重建误差关于基线误差的传递关系。由此传递关系,可知系统对轨道测量精度的要求很高,而利用GCP时,相同轨道测量精度条件下,重建误差大大减小。故为了在保持重建精度的情况下降低对轨道测量精度的要求,可以利用GCP。另外上述分析得出的误差传递关系可以用来指导系统一些参数的设计。
- 干涉合成孔径雷达; 重建; 基线误差; 误差分析; 地面控制点
Abstract: DEM reconstruction is a step in data processing of spaceborne InSAR, its error is influenced by baseline error and GCP, etc. In this paper, DEM reconstruction method using GCP based on classic one was presented. To the reconstruction methods, the tranferring relationship between reconstruction error and baseline error was analyzed. The relationship shows that the requirement on orbit measuring precision is exigent, but when using GCP, in the situation of the same orbit measuring precision, the reconstruction error is reduced. In order to reduce the requirement on orbit measuring precision and at the same time to keep reconstruction precision, GCP should be used. In addition , the transferring relationship can direct designing some parameters of the system.

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