Squint-mode InlSAR imaging based on nonlinear least square and coordinates transform

Aiming at the interferometric inverse synthetic aperture radar (InlSAR) imaging in the presence of squint, we investigate the influence of squint on the InlSAR imaging. First, coupling of the squint additive phase and the target azimuth/altitude coordinates to be solved may make the solution more di...

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Bibliographic Details
Published in:Science China. Technological sciences 2011-12, Vol.54 (12), p.3332-3340
Main Authors: Liu, Chenglan, He, Feng, Gao, Xunzhang, Li, Xiang, Shen, Rongjun
Format: Article
Language:English
Subjects:
Algorithms
Computer simulation
Imaging
Least squares method
Nonlinearity
Three dimensional
Transforms
Online Access:Get full text
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Summary:Aiming at the interferometric inverse synthetic aperture radar (InlSAR) imaging in the presence of squint, we investigate the influence of squint on the InlSAR imaging. First, coupling of the squint additive phase and the target azimuth/altitude coordinates to be solved may make the solution more difficult. Second, the squint angle may lead to estimation error of the vertical coordinates and distortion of the ultimate image. Traditional InlSAR imaging algorithms can not solve the above two problems effectively, so we propose a new method which combines the nonlinear least square (NLS) and coordinates transform (CT) to estimate the target coordinates, and a three-dimensional (3-D) image consistent with the real target is obtained accordingly. Simulations show that the proposed method is effective for the squint-mode InlSAR imaging.
ISSN:1674-7321
DOI:10.1007/s11431-011-4515-9