机载波谱仪海浪谱反演方法及其验证

发布时间：2018-06-17 14:52

本文选题：波谱仪 + 功率谱估计　；参考：《海洋科学》2016年12期

【摘要】：为了验证波谱仪反演二维海浪谱的功能,根据海浪波谱仪的信号形成机制,总结了机载波谱仪反演海浪的流程。利用机载波谱仪回波数据,通过自相关和互相关两种功率谱估计方法,反演了二维海浪谱。最后通过与浮标测量的二维海浪谱进行对比,验证了该机载波谱仪探测二维海浪谱的有效性。结果表明,无论采用自相关函数还是互相关函数进行功率谱估计,得到的主波波长和有效波高与实际二维海浪谱基本一致。互相关函数法得到的交叉谱能去除180°模糊现象,其在计算有效波高时相对于自相关函数会稍微偏小。在计算斜率方差时可以采用5°~12°入射角范围的后向散射系数进行公式拟合,因此定标与否并不影响最后的二维海浪谱结果,未来星载波谱仪只有靠多波束联合才能实现。
[Abstract]:In order to verify the function of wave spectrometer in retrieving two-dimensional wave spectrum, according to the signal forming mechanism of wave spectrometer, the process of wave inversion by machine carrier spectrometer is summarized. Two dimensional wave spectrum is retrieved by means of autocorrelation and cross-correlation power spectrum estimation using the echo data of the machine carrier spectrometer. Finally, compared with the wave spectrum measured by buoy, the validity of the carrier spectrometer is verified. The results show that the main wave length and effective wave height obtained by using autocorrelation function or cross-correlation function for power spectrum estimation are basically consistent with the actual two-dimensional wave spectrum. The cross spectrum obtained by the cross correlation function method can remove 180 掳ambiguity, and it will be slightly smaller than the autocorrelation function in calculating the effective wave height. In the calculation of slope variance, the backscattering coefficient in the range of 5 掳and 12 掳incidence angle can be used to fit the formula, so whether or not calibration does not affect the final two-dimensional wave spectrum results, the future star carrier spectrometer can only be realized by multi-beam combination.
【作者单位】：南京信息工程大学;国家海洋局第一海洋研究所;北京遥测技术研究所;
【基金】：国家重点研发计划子课题(2016YFC1401005) 江苏省自然科学基金项目(BK2011008) 国家自然科学基金(41476158) 江苏省高等教育优势学科项目~~
【分类号】：P714

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