海面风速影响合成孔径雷达探测海洋内波能力的模拟试验分析

Simulation Analysis of The Influence of Sea Surface Wind Speed on The Ability of Synthetic Aperture Radar to Detect Ocean Internal Waves

摘要:

星载合成孔径雷达是探测海洋内波的重要手段之一，海面风速对合成孔径雷达探测海洋内波的能力影响显著。本文基于海面风速影响合成孔径雷达探测海洋内波能力理论，结合实测海洋内波参数和相应的海洋环境、合成孔径雷达数据，分析了海洋内波及其在合成孔径雷达图像上成像机理，论述了上升型和下降型海洋内波的不同表现形式，阐述了在不同风速条件下，内波振幅、跃层深度和跃层强度共同作用下的合成孔径雷达探测海洋内波能力。模拟试验分析结果表明：海面风速越小、内波振幅越大、跃层深度越浅、跃层强度越大时，合成孔径雷达探测海洋内波能力越强。本成果可为星载合成孔径雷达探测海洋内波前期的卫星观测任务规划提供技术支撑。

Abstract:

Spaceborne synthetic aperture radar is one of the important means of detecting ocean internal waves, and sea surface wind speed has a significant impact on the ability of synthetic aperture radar to detect ocean internal waves. Based on the theory of the influence of sea surface wind speed on the ability of synthetic aperture radar to detect ocean internal waves, combining the in-situ measured parameters of ocean internal waves, additional with the corresponding ocean environment and synthetic aperture radar data, this paper analyzes the imaging mechanism of ocean internal waves on synthetic aperture radar images, discusses the different manifestations of upward and downward ocean internal waves, and elaborates on the ability of synthetic aperture radar to detect ocean internal waves under the combined influence of internal wave amplitude, thermocline depth, and thermocline intensity under different wind speed conditions. Simulation analysis shows that the smaller the sea surface wind speed, the larger the internal wave amplitude, the shallower the thermocline depth, and the stronger the thermocline intensity, the stronger the ability of synthetic aperture radar to detect internal waves in the ocean. The results can provide technical support for the planning of satellite observation tasks in the early stage of detecting ocean internal waves using spaceborne synthetic aperture radar.