Frontiers of Information Technology & Electronic Engineering
>> 2016,
Volume 17,
Issue 10
doi:
10.1631/FITEE.1500311
Article
Effects of residual motion compensation errors on the performance of airborne along-track interferometric SAR
. Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China.. University of the Chinese Academy of Sciences, Beijing 100190, China.. Key Laboratory of Technology in Geo-spatial Information Processing and Application Systems, Beijing 100190, China.. Science and Technology on Millimeter-Wave Laboratory, Beijing 100854, China
Available online: 2016-11-04
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Abstract
Two approximations, center-beam approximation and reference digital elevation model (DEM) approximation, are used in synthetic aperture radar (SAR) motion compensation procedures. They usually introduce residual motion compensation errors for airborne single-antenna SAR imaging and SAR interferometry. In this paper, we investigate the effects of residual uncompensated motion errors, which are caused by the above two approximations, on the performance of airborne along-track interferometric SAR (ATI-SAR). The residual uncompensated errors caused by center-beam approximation in the absence and in the presence of elevation errors are derived, respectively. Airborne simulation parameters are used to verify the correctness of the analysis and to show the impacts of residual uncompensated errors on the interferometric phase errors for ATI-SAR. It is shown that the interferometric phase errors caused by the center-beam approximation with an accurate DEM could be neglected, while the interferometric phase errors caused by the center-beam approximation with an inaccurate DEM cannot be neglected when the elevation errors exceed a threshold. This research provides theoretical bases for the error source analysis and signal processing of airborne ATI-SAR.
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