星载SAR测量海洋流场研究进展

Progress in sea surface current retrieval from spaceborne SAR measurements

多普勒信息是合成孔径雷达(SAR)进行海洋动力遥感的一个重要参数,自从20世纪80年代末就已经开始利用该参数反演海表面动力过程的相关研究.本文重点论述了星载SAR多普勒信息反演海表面流及其应用研究,主要包括SAR干涉测量方法获取海洋流场信息的主要技术手段及研究进展;多普勒频移方法反演表层海洋流场的发展历程及在上层海洋现象(包括地转流、准地转流以及中小尺度过程)中的应用研究;相关的国外重要数据融合计划和研发计划.目前国内在海洋流场的遥感方面还处于起步阶段,重点关注于反演理论和方法,而将反演信息应用于上层海洋动力的研究,还十分缺乏.希望通过本文的综述,为后续在该方向的研究提供借鉴.

Doppler signal is an important synthetic aperture radar(SAR) parameter for ocean dynamics remote sensing.It was first used for the retrieval of ocean surface dynamic processes in the late 1980 s.In this paper,we review the researches on retrievals of sea surface dynamics from spaceborne SAR Doppler measurements including:(1) SAR interferometry techniques and related research progress for ocean surface currents retrieval;(2) SAR Doppler shift and its application in retrieval of upper ocean dynamics(i.e.geostrophic currents,quasi-geostrophic currents,and meso-and small-scale processes);(3) Relevant data fusion and important R&D programs around the world.However,China’s remote sensing of sea currents is still in the initial stage,and highly focused on retrieval theory and techniques.The application of the retrieved information in study of upper ocean dynamics is still limited,so this review can serve as a reference for future studies in this direction.