InSAR测高中大气水汽影响仿真与分析

doi:10.16182/j.issn1004731x.joss.201808035

摘要/Abstract

摘要： 对流层水汽引起的信号延迟是影响重复轨道InSAR测高精度的主要因素之一。为了定量研究水汽对InSAR测高精度的影响机理,推导大气相位测高影响的规律,设计利用DEM模拟无噪声重复轨道InSAR干涉图,垂直分层水汽模型模拟水汽延迟相位的高程反演与水汽影响分析的仿真方案。实验参照河南某地区SAR成像时系统参数和基线参数,采用垂直分层水汽模型,由DEM仿真受水汽影响的干涉图,并进行高程反演精度的统计分析。实验结果表明大气水汽对InSAR测高的影响较大,在航高788 km、中心侧视角23°、基线长度80 m的系统参数下,0.5mm的可降水量造成高程误差在8~22m,中误差为13.16m,且其引起的测高误差随着斜距、侧视角的增大而增大,基线长度的减小而增大。

关键词: 大气效应, 水汽, 合成孔径雷达干涉测量, 仿真, 数字高程模型

Abstract: The atmospheric phase delay caused by tropospheric water vapor (WV) is an important factor to the precision of repeat-pass mode interferometry synthetic aperture radar (InSAR). To study the WV effect quantitatively, the regulation of WV effect in repeat-pass InSAR is analyzed and the simulation scheme is designed in which the DEM and WV model is used to simulate InSAR interferogram and WV delay phase, and the derived height is analyzed. The experiment is performed by using systems and baseline parameters of SAR images of Henan;WV effected interferogram is simulated using DEM and vertical layered WV model; and the derived height is also analyzed. Experimental results show that the errors of WV effect cannot be ignored in height deriving in InSAR, as the errors come to 8-22m and RMS is 13.16m when WV is 0.5mm with the antenna height at 780km, incidence angle at 23°and baseline length at80m;and the errors caused by WV increase with the incidence angle and slant range increasing, while decrease with baseline increasing.

Key words: atmospheric effects, water vapor, InSAR, simulation, DEM

中图分类号:

P237

王新田, 靳国旺, 熊新, 张红敏, 徐青. InSAR测高中大气水汽影响仿真与分析[J]. 系统仿真学报, 2018, 30(8): 3105-3114.

Wang Xintian, Jin Guowang, Xiong Xin, Zhang Hongmin, Xu Qing. Simulation and Analysis of Atmospheric Effects on Height Deriving from InSAR[J]. Journal of System Simulation, 2018, 30(8): 3105-3114.

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