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《工程(英文)》 >> 2020年 第6卷 第8期 doi: 10.1016/j.eng.2020.07.003

利用地球同步轨道InSAR每日生成DEM的质量分析

a School of Geosciences and Info-Physics, Central South University, Changsha 410083, China
b Department of Land Surveying and Geo-Informatics, The Hong Kong Polytechnic University, Hong Kong 999077, China
c China Aerospace Science and Technology Corporation, Beijing 100048, China

收稿日期: 2018-10-20 修回日期: 2019-09-28 录用日期: 2020-06-29 发布日期: 2020-07-15

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摘要

最新的数字高程模型(DEM)产品在灾害防治、城市管理等诸多领域中扮演着重要角色。利用机载或低地球轨道(LEO)的星载干涉合成孔径雷达(InSAR)生成DEM已被证明是可行且极具价值的方法。然而,受成本和卫星重返周期的限制,该技术难以频繁(如每天)生成或更新大区域范围(如大陆尺度或更大范围)的DEM。由于对地同步合成孔径雷达(GEOSAR)卫星运行于地球静止轨道,因此它们能以相当短的重返时间(每天或更短)观测同一地面区域,这为实现生成每日DEM这一理想但目前难以实现的目标提供了潜在可能。为此,本文系统地分析了利用GEOSAR卫星生成的每日DEM产品质量。结果表明:GEOSAR卫星生成的每日DEM产品精度通常远低于利用传统低轨星载合成孔径雷达(SAR)获得的DEM产品。因此,研究GEOSAR DEM生成过程中的误差削弱方法显得至关重要。

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