摘要
海浪是重要的海洋环境参数,它对港口建设、海上航行、油气田开发等具有重要的意义。合成孔径雷达(SYNTHETIC A PERTURE R ADAR,SAR)是目前大范围测量海浪的主要工具,用它来估计海浪主波系统的波长和传播方向比较好,但要定量的提供海浪的振幅以及SAR图像强度与实际海面的关系是相当困难的,而且由SAR图像获取海浪方向谱也比较复杂。沿航迹干涉合成孔径雷达(A LONG-T RACK INTERFEROM ETRIC SYNTHETIC A PERTURE R ADAR,AT I-SAR)是在平台飞行方向上安置两根天线的双天线合成孔径雷达。相对于合成孔径雷达,真实孔径雷达调制传递函数对沿航迹干涉合成孔径雷达相位图像的影响很小,因此沿航迹干涉合成孔径雷达更适合测量海浪。详细介绍了沿航迹干涉合成孔径雷达海浪遥感的成像机制,为进一步反演海浪方向谱奠定了基础,最后针对目前研究存在的问题以及今后有待研究的方向进行了探讨。
Ocean wave is an important ocean environment parameter. It has significant meaning for harbor construction, navigation and exploitation of oil field. Synthetic Aperture Radar （SAR） is a primary instrument to measure ocean wave in large-scale area. SAR estimates wavelength and direction of propagation quite well, But it is very difficult to provide quantificationally amplitude of ocean wave as well as relation between SAR image intensity and ocean surface. Besides, it is complex to obtain ocean wave spectrum from SAR image spectrum. Along-Track Interferometric Synthetic Aperture Radar （ATI-SAR） is an active coherent imaging system, which has two antennas separated along the platform flight direction. The phrase image of ATI-SAR less depend on real aperture radar modulation transfer function than synthetic aperture radar. Therefore, ATI-SAR is more suitable to measure ocean wave. This paper introduces the imaging mechanism of ocean wave by Along-Track Interferometric Synthetic Aperture Radar, It establish firm foundation to inverse ocean wave directional spectrum further. Finally, we discuss some issues in present study and research orientation in the future.
出处
《遥感技术与应用》
CSCD
2006年第1期11-17,共7页
Remote Sensing Technology and Application
基金
国家自然科学基金项目"干涉雷达海洋定量遥感理论和数值模拟研究"(编号:NSFC40276050)资助
关键词
干涉合成孔径雷达
海浪遥感
成像机制
海浪方向谱
Interferometric synthetic aperture radar, Remote sensing of ocean wave, Imaging mechanism,Ocean wave directional spectrum
