海洋波谱仪有效波高反演方法的仿真分析

Simulation on Retrieval Method of Significant Wave Height from Ocean Wave Spectrometer

海洋波谱仪是用于测量海浪方向谱的实孔径雷达,因其具有测量精度高、数据处理简单等特点,成为目前波浪谱测量的一个重要技术手段。对利用波谱仪回波直接反演有效波高的方法进行研究,首先通过仿真分析波谱仪天线方向图对回波的影响,然后以风速为输入参量,模拟产生海表面,参考Barrick回波卷积模型,计算粗糙海面的回波功率信号,并利用拟合算法反演有效波高。最后将反演得到的有效波高与输入海面的有效波高进行对比,分析不同风速下有效波高的反演精度。

The ocean wave spectrometer is a real aperture radar used to measure the directional spectra of ocean waves.Because of its high wavelength resolution and simple processing method,the instrument becomes a major tool for the measurement of sea-surface waves. The paper mainly focuses on the method to retrieve the SWH( Significant Wave Height) directly from wave spectrometer data. Firstly,the effect on the echo data due to antenna pattern of wave spectrometer is analyzed. Then,the wind speed is regarded as the input parameter to simulate a physical sea surface which is used to calculate the echo signal,based on Barrick return wave model,backscattered from rough sea surface. Finally,the retrieved SWH is compared with the SWH computed from the input sea surface height to analyze the retrieval precision under different wind speeds.