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Proceedings Paper

Resolution improvement in both azimuthal and range directions with repeat-pass spaceborne SAR
Author(s): Yunhua Zhang; Xiaojin Shi; Jingshan Jiang
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Paper Abstract

This paper introduces a simple method to obtain a much higher resolution than the designed resolution in both azimuthal and rang directions for SAR by synthesizing the data taken by repeat passes without increasing any complexity in SAR hardware and satellite platform. The basic idea of the method is to firstly establish the equivalence between the signal models of repeat pass SAR signals in both azithumal and range directions and the signal model of stepped frequency chirp signals (SFCSs) when some conditions are presumed, i.e. for range direction, interferometric condition is required and for azimuthal direction, a small squint angle increase between repeat passes is required, and then using the already proposed method for SFCSs compression to process the data of repeat passes. In the course of processing, each observation in range direction or in azimuthal direction is treated as a subchirp in SFCSs. The major facts affecting the final resolution one could get are investigated and found. They are the relative range measurement accuracy and the absolute squint angle measurement accuracy between repeat passes. Detailed derivations and simulations are presented to show the effectiveness of the method.

Paper Details

Date Published: 18 October 2007
PDF: 9 pages
Proc. SPIE 6746, SAR Image Analysis, Modeling, and Techniques IX, 67460N (18 October 2007); doi: 10.1117/12.737621
Show Author Affiliations
Yunhua Zhang, Ctr. for Space Science and Applied Research (China)
Xiaojin Shi, Ctr. for Space Science and Applied Research (China)
Graduate Univ. of the Chinese Academy of Sciences (China)
Jingshan Jiang, Ctr. for Space Science and Applied Research (China)

Published in SPIE Proceedings Vol. 6746:
SAR Image Analysis, Modeling, and Techniques IX
Claudia Notarnicola; Francesco Posa, Editor(s)

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