基于北斗卫星反射信号的海面风速探测

Ocean surface wind speed detection based on reflected signal of Beidou satellite

通过研究北斗反射信号与海洋状态的关系,在岸基条件下提出一种利用反射信号一维时延功率谱面积间接计算海面风速的方法,并对威海岸基试验的数据进行处理和分析。通过分析不同阈值下的功率谱面积与有效波高(SWH)的相关系数大小,设定合适的功率谱阈值,建立功率谱面积与有效波高的经验关系,同时利用数据拟合建立有效波高与海面风速的关系。通过与海洋站同比风速的对比,反演风速的均方根误差为2.10 m/s,两者具有很好的一致性,验证了此方法的可行性。

By analyzing the relationship between the Beidou reflected signal and sea state, a method of using the one-di- mensional delay power spectrum area of the reflected signal to calculate the ocean surface wind speed indirectly under the coastal condition is proposed to process and analyze the data of Weihai coastal experiment. The correlation coefficient of the power spec- trum area with different thresholds and significant wave height （SWH） is analyzed to set the suitable power spectrum threshold, and establish the empirical relationship between the power spectrum area and SWH. The relation between the SWH and sea sur- face wind speed was established with data fitting. In comparison with the wind speed of the ocean station, the root-mean-square error of the inversion wind speed is 2.10 m/s, and the two results of the ocean station and the ocean surface wind speed calcula- tion method have good consistency. The validity of the method was verified.