A Coregistration Method for Ocean Surface Complex Images of Along-track Interferometric SAR without Control Point
Funds:
The Foundation of National Key Laboratory of Science and Technology on Microwave Imaging (CXJJ_15S119)
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摘要: 順軌干涉SAR海面復圖像通常利用靜止陸地參考點進行配準，獲得精確有效的海洋流場干涉相位信息。復圖像中無參考點時，僅能依據(jù)海浪紋理進行配準，受海面隨機運動以及低信噪比的影響，配準像素偏移往往會出現(xiàn)像素級誤差，并導致干涉相位圖質(zhì)量嚴重下降。根據(jù)大尺度海浪變化周期較長，在干涉成像間隔內(nèi)可視作靜止這一特征，該文提出保留大尺度海浪對應的方位譜分量以提高數(shù)據(jù)信噪比和相關性，進而提高配準精度的方法，并選用海面實際方位分辨率作為大尺度海浪方位譜選取范圍的約束條件。通過機載順軌干涉SAR實驗數(shù)據(jù)證明，所提方法可有效提高無參考點海面復圖像的配準精度。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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