面向多基线干涉SAR编队系统的海表流速测量方法研究*

doi:10.7523/j.ucas.2024.079

摘要/Abstract

摘要： 分布式编队SAR通过顺轨干涉可实现海表流速测量,然而交轨基线的存在使得干涉相位中叠加了平地效应、海浪波高和海面高程等相位,难以直接通过干涉相位精确反演海表流速。本文提出一种面向多基线干涉SAR编队系统的海表流速测量方法,首先基于波浪运动和噪声分布特点,提出基于空间平均的海浪波高、大尺度波轨道速度和噪声相位的联合抑制方法,有效抑制这些干扰项;然后针对径向流速相位和海面高程相位相互耦合问题,提出基于多基线的海面径向流速和高程相位解耦合方法,通过引入另一干涉对提高数据处理自由度,联合两组耦合干涉相位完成流速和高程相位的有效分离,实现径向流速的高精度测量。最后使用宏图1号的实测数据验证了所提方法的有效性。

关键词: 分布式合成孔径雷达(SAR), 多基线干涉, 沿迹干涉(ATI), 海表流速测量, 相位解耦合

Abstract: The distributed formation synthetic aperture radar (SAR) can achieve ocean surface velocity measurement through along-track interferometry. However, the existence of cross-track baselines introduces phase influences from flat earth effect, ocean wave height, and sea surface height into the interferometric phase, making it challenging to directly retrieve sea surface velocity accurately from the interferometric phase. This paper proposes a method for measuring ocean surface velocity using a multibaseline interferometric SAR formation system. Firstly, considering the characteristics of wave motion and noise distribution in the scene, a joint suppression method for wave height phase, large-scale wave orbital velocity phase, and noise phase based on spatial averaging is proposed, which effectively suppresses these interferometric phases. Then, to address the coupling issue between the radial velocity phase and sea surface height phase, a method for decoupling the radial velocity phase and height phase based on multibaseline is introduced. By introducing another interference pair to improve the degree of freedom in data processing, the effective separation of these two phase terms is achieved through two sets of coupled interference phases, achieving high-precision measurement of radial flow velocity. Finally, the proposed method was validated using the measured data from the Hongtu-1 satellite, and the results proved the effectiveness of the proposed method.

Key words: distributed synthetic aperture radar (SAR), multibaseline interferometry, along-track interferometric (ATI), ocean surface velocity measurement, phase decoupling

中图分类号:

P731.21

谢毓鸿, 郑明洁, 王吉利, 李鸿祥, 徐开江, 罗超, 刘俭. 面向多基线干涉SAR编队系统的海表流速测量方法研究^*[J]. 中国科学院大学学报, DOI: 10.7523/j.ucas.2024.079.

XIE Yuhong, ZHENG Mingjie, WANG Jili, LI Hongxiang, XU Kaijiang, LUO Chao, LIU Jian. Research on ocean surface velocity measurement method for multibaseline interferometric SAR formation system[J]. Journal of University of Chinese Academy of Sciences, DOI: 10.7523/j.ucas.2024.079.

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面向多基线干涉SAR编队系统的海表流速测量方法研究^*

Research on ocean surface velocity measurement method for multibaseline interferometric SAR formation system

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