基于X波段雷达回波图像相关性分析的浅海水深数值模拟与反演研究

Study on the Numerical Simulation and Inversion of Shallow Water Depth Based on Correlation Analysis of X Band Radar Echo Images

根据描述有限水深的TMA海浪谱模型,对X波段雷达浅海区域海面回波进行了数值模拟;TMA海浪谱模型是深水JONSWAP谱的扩展,它能反映水深变化对海浪的影响。对利用X波段雷达回波图像相关性分析来反演浅海水深方法的适用条件以及性能进行了分析;该方法利用雷达对海杂波成像,结合回波图像之间理论与实际相关性之间差值累计量的最小值与水深的对应关系,可以得到雷达探测区域的水深信息。数值模拟以及水深反演结果表明:图像相关性方法在水深小于25 m时有较好的水深估算能力;但当水深大于25 m时,此方法会失去其水深反演能力。通过对模拟的图像进行水深提取,有效的验证了谱模型的准确性以及相关性方法的适用范围,为后续X波段雷达水深研究提供了很好的依据。

According to the TMA wave spectrum in finite depth water, numerical simulation of X band radar echo images with the shallow water depth is carried out. TMA wave spectrum is an extension of JONSWAP wave spectrum which can reflects the impact of water depth change. The study on the inversion of shallow water depth based on correlation analysis of X band radar echo images is implemented. The depth information of detection re- gion can obtained using the correspondence between depth and the minimum deviation of the total amount of theory and actual correlation analysis of X band radar echo images. The results of numerical simulation and inversion of shallow water depth show that the method based on the correlation analysis of X band radar echo images will has the better ability of depth inversion when the depth is less than or equal to 25 m. While depth large than 25 m, the method will loses its capability to obtain the information of depth. The study of numerical simulation and inversion of shallow water depth analyzed the accuracy of the wave spectrum model and the range of the method of correlation analysis of X band radar echo images. It＇ s provides a good foundation for further research on inversion of depth based on X band radar.