Atmospheric Phase Screen in GEO-SAR: Estimation and Compensation

被引：40

作者：

Guarnieri, Andrea Monti ^{[1
]}

Leanza, Antonio ^{[1
]}

Recchia, Andrea ^{[2
]}

Tebaldini, Stefano ^{[1
]}

Venuti, Giovanna ^{[3
]}

机构：

[1] Politecn Milan, Dipartimento Elettron Informaz & Bioingn, I-20133 Milan, Italy

[2] Aresys Srl, I-20132 Milan, Italy

[3] Politecn Milan, Dipartimento Civile Ambientale, I-20133 Milan, Italy

来源：

IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING | 2018年 / 56卷 / 03期

关键词：

Meteorology; radar clutter; radar imaging; radar interferometry; synthetic aperture radar (SAR); SYNTHETIC-APERTURE RADAR; GEOSYNCHRONOUS CIRCULAR SAR; PERMANENT SCATTERERS; INTERFEROMETRY; DECORRELATION; ERRORS; VEGETATION; RETRIEVAL; AUTOFOCUS; SCANSAR;

D O I：

10.1109/TGRS.2017.2766084

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

We study the impact of atmospheric turbulence, specifically the wet tropospheric delay, in that synthetic aperture radar (SAR) with very long integration time, from minutes to hours, and wide swaths, such as the geosynchronous or geostationary SAR. In such systems, the atmospheric phase screen (APS) cannot be assumed frozen in time as for Low Earth Orbit or airborne SARs nor constant in space as for the ground-based SAR. The impact of space-time turbulence on SAR focusing is quantitatively assessed, and a novel focusing method that integrates APS estimation and compensation is proposed. Performances are evaluated as a function of SAR parameters, mainly the wavelength, based on a parametric model of the APS variogram, and results achieved by a simulating realistic scenario are shown.

引用

页码：1668 / 1679

页数：12

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