A Phase-Offset Estimation Method for InSAR DEM Generation Based on Phase-Offset Functions

被引:11
作者
Mura, Jose Claudio [1 ]
Pinheiro, Muriel [2 ]
Rosa, Rafael [2 ]
Moreira, Joao Roberto [2 ]
机构
[1] Natl Inst Space Res INPE, BR-12227010 Sao Jose Dos Campos, SP, Brazil
[2] Orbisat Amazonia SA ORBISAT, BR-12244000 Sao Jose Dos Campos, SP, Brazil
关键词
SAR Interferometry; phase offset estimation; absolute phase; DEM; RADAR INTERFEROMETRY; SAR;
D O I
10.3390/rs4030745
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
This paper presents a novel method for estimating the absolute phase offset in interferometric synthetic aperture radar (SAR) measurements for digital elevation model (DEM) generation. The method is based on "phase-offset functions (POF)," relating phase offset to topographic height, and are computed for two different overlapping interferometric data acquisitions performed with considerably different incidence angles over the same area of interest. For the purpose of extended mapping, opposite viewing directions are preferred. The two "phase-offset functions" are then linearly combined, yielding a "combined phase-offset function (CPOF)". The intersection point of several straight lines (CPOFs), corresponding to different points in the overlap area allows for solving the phase offset for both acquisitions. Aiming at increasing performance and stability, this intersection point is found by means of averaging many points and applying principal component analysis. The method is validated against traditional phase offset estimation with corner reflectors (CR) using real OrbiSAR-1 data in X- and P-band.
引用
收藏
页码:745 / 761
页数:17
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