High-Resolution Sea Surface Current Vector Field Inversion Based on Circular Scanning SAR
High-Resolution Sea Surface Current Vector Field Inversion Based on Circular Scanning SAR
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DOI：
10.1109/jstars.2023.3292613
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发表时间：
2023
影响因子：
5.5
通讯作者：
Xiaonan Yao;Xiaoqing Wang;Lixia Liu;Shubo Liu;Xiang Su;Haifeng Huang;Zheng Lu
中科院分区：
文献类型：
--
作者：
Xiaonan Yao;Xiaoqing Wang;Lixia Liu;Shubo Liu;Xiang Su;Haifeng Huang;Zheng Lu
多普勒散射计是真实的孔径雷达与圆扫描天线配合使用的一种仪器，具有宽测绘带和多角度特性。许多学者利用多普勒散射仪研究了海面流矢量场。而现有的方法直接利用谱仪回波的相位差来获得电流矢量场，分辨率可以得到提高。提出了一种基于圆扫描合成孔径雷达（SAR）的高分辨率海面流场反演方法。该方法利用单幅复图像的多普勒谱估计电流场，实现高分辨率的电流矢量场反演。圆扫描SAR的海流场反演对姿态和风场误差非常敏感。在此基础上，建立模型研究了主要误差对多普勒频移估计的影响，提出了一种全局优化方法，实现了高精度的流速反演和同步误差估计。利用机载圆扫描SAR数据验证了该方法的有效性。
The Doppler scatterometer is an instrument used in real aperture radar in conjunction with a circular scanning antenna and has wide swath and multiangle characteristics. Many scholars have studied sea surface current vector field based on the use of the Doppler scatterometer. However, the existing methods directly use the phase difference of the spectrometer's echo to obtain the current vector field, and the resolution can be improved. This study proposes a high-resolution inversion method for ocean surface current fields based on circular scanning synthetic aperture radar (SAR). The current field is estimated by the proposed method based on the Doppler spectrum of the single complex image to realize high-resolution current vector field inversion. The current field inversion of circular scanning SAR is very sensitive to attitude and wind field errors. Accordingly, a model is established to study the influences of the main errors on Doppler shift estimation, and a global optimization method is proposed to realize high-precision current velocity inversion and synchronous error estimation. The effectiveness of this method is verified by using airborne circular scanning SAR data.