Quantitative analysis of the influence of terrain undulations on SAR image registration

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Abstract

Registration of synthetic aperture radar (SAR) images plays an important role in correcting cumulative errors in inertial navigation systems (INS) to improve the locating accuracy of aircraft navigation systems. However, terrain variations which lead to geometry deformations in SAR images significantly degrade the registration performance. The causes of the geometric deformations in SAR imaging mechanism were analyzed to develop an algorithm to calculate the registration errors induced by terrain undulations using the digital elevation model (DEM) of real-time SAR images. This algorithm can rapidly predict the upper and lower bounds of the registration errors. Furthermore, the prediction can be calculated before registration for all algorithms for compensation to improve the registered results. Tests using 90 pairs of referenced and real-time SAR images demonstrate that the registration errors induced by terrain undulations are all located between the predicted upper and lower bounds.

Keywords synthetic aperture radar (SAR) terrain undulations digital elevation model (DEM) registration errors upper bound lower bound

Issue Date: 15 April 2014

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	Wenting MA
	Jian YANG
	Yi CUI
	Wei GAO

Cite this article:

Wenting MA,Jian YANG,Yi CUI, et al. Quantitative analysis of the influence of terrain undulations on SAR image registration[J]. Journal of Tsinghua University(Science and Technology), 2014, 54(4): 432-436.

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http://jst.tsinghuajournals.com/EN/ OR http://jst.tsinghuajournals.com/EN/Y2014/V54/I4/432

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