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提出了一种利用卫星高度计测量的同步双波段雷达散射截面数据(σ0Ku 和σ0C)提取海面风速特别是高风速信息的补偿算法。这一方法的基本思想是假定在正常情况下,高度计测量的Ku 和C波段的后向散射截面对于某一风速存在一种“标准”关系,降雨和大浪等异常大气海洋过程的出现会导致σ0Ku /σ0C 偏离其“标准”位置而产生一个系统误差,通过对这一系统误差进行修正和补偿,可以有效地消除其影响并显著提高高度计海面风速的反演精度。实验表明,与通常采用的单波段海面风速反演算法相比,双波段补偿法可提高精度10% 左右。
A compensating algorithm for extracting information of wind speed, especially high wind speed, from synchrotron dual-band radar cross section data (σ0Ku and σ0C) measured by satellite altimeters is proposed. The basic idea of this approach is to assume that under normal conditions there is a “standard” relationship between the backscattered cross sections of the Ku and C bands measured by the altimeters for a given wind speed. The occurrence of abnormal atmospheric ocean processes such as rainfall and high tides will lead to σ0Ku / Σ0C deviates from its “standard” position to generate a systematic error. By correcting and compensating for this systematic error, it is possible to effectively eliminate its influence and significantly improve the inversion accuracy of the altimeter surface wind velocity. Experiments show that the dual-band compensation method can improve the accuracy by about 10% compared with the commonly used single-band sea surface wind velocity inversion algorithm.