天绘二号卫星双基成像几何模型改正算法

主辅星的成像几何模型直接影响着InSAR数据处理的多个环节, 包括复影像概略配准、去平地效应、InSAR定位、基线定标、区域网平差、正射纠正等。天绘二号卫星在成像时, 为了保证算法统一, 主辅星都采用了收发分置的双基成像几何模型。对于影像概略配准、去平地效应、InSAR定位等环节, 双基成像模型只是增加了算法的复杂度, 但对于基线定标, 这带来了新的挑战: ①现有基线定标算法均针对主辅星为单基成像的几何模型, 无法适用于天绘二号; ②收发两两组合产生4条基线, 4条基线存在相关, 导致基线定标难以实施。为了确保基线定标精度, 本文提出了主辅星双基成像几何模型改正算法, 并对辅星成像几何模型的改...

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Published in:Ce hui xue bao 2022-12, Vol.51 (12), p.2417
Main Authors: 陈刚, 钱方明, 刘志铭, 楼良盛
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Language:chi ; eng
Subjects:
Accuracy
Algorithms
Calibration
Chaos theory
Complexity
Error analysis
Imaging
Theoretical analysis
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钱方明
刘志铭
楼良盛
description 主辅星的成像几何模型直接影响着InSAR数据处理的多个环节, 包括复影像概略配准、去平地效应、InSAR定位、基线定标、区域网平差、正射纠正等。天绘二号卫星在成像时, 为了保证算法统一, 主辅星都采用了收发分置的双基成像几何模型。对于影像概略配准、去平地效应、InSAR定位等环节, 双基成像模型只是增加了算法的复杂度, 但对于基线定标, 这带来了新的挑战: ①现有基线定标算法均针对主辅星为单基成像的几何模型, 无法适用于天绘二号; ②收发两两组合产生4条基线, 4条基线存在相关, 导致基线定标难以实施。为了确保基线定标精度, 本文提出了主辅星双基成像几何模型改正算法, 并对辅星成像几何模型的改正精度进行了分析。理论分析和试验表明该方法引入误差很小, 可以忽略不计。
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subjects Accuracy
Algorithms
Calibration
Chaos theory
Complexity
Error analysis
Imaging
Theoretical analysis
title 天绘二号卫星双基成像几何模型改正算法
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