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| A Coregistration Method for Ocean Surface Complex Images of Along-track Interferometric SAR without Control Point |
| KONG Weiya①②③ CHONG Jinsong①② |
①(Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China)
②(National Key Laboratory of Science and Technology on Microwave Imaging, Beijing 100190, China)
③(University of Chinese Academy of Sciences, Beijing 100190, China) |
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Abstract In order to get high-precision interferogram of ocean surface current, static control points from land area are normally used to coregistrate ocean surface complex images of along-track interferometric SAR. When there is no control point in the image, ocean wave texture can only be used instead. Under the influence of stochastic movement and low signal-to-noise ratio of the ocean, the coregistration error tends to exceed one pixel, hence damages the quality of interferogram severely. Since the period of large-scale wave is much longer than the interferometric interval, large-scale wave can be treated as static during the interval. Based on this matter of fact, this paper proposes a coregistration method by reserving the spectrum of large-scale wave to improve the signal-to-noise ratio and correlation coefficient, further improving the coregistration precision. Ocean azimuth resolution is used as the criterion to decide which part of the spectrum should be reserved. Airborne along-track interferometric SAR data is demonstrated here, proving the proposed method can improve the coregistration precision of ocean surface complex images without control point.
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Received: 17 March 2017
Published: 14 September 2017
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| Fund:The Foundation of National Key Laboratory of Science and Technology on Microwave Imaging (CXJJ_15S119) |
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Corresponding Authors:
CHONG Jinsong
E-mail: iecas_chong@163.com
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