GNSS-R海面风场数据处理技术探讨

Discussion on GNSS-R sea surface wind field data processing technology

为进一步提高海面风速反演精度,提出1种基于GNSS-R的海面风场数据处理技术:指出需要进行功率校准的原因是由于接收机增益随温度变化,使接收到的信号功率(校准前)受温度影响,导致在不同温度环境下,反演风速不一致;给出接收到的信号功率、噪声功率以及当载荷信号源变为定标负载时的噪声功率随温度的变化规律,分析利用3者之间的关系,可消除温度对功率的影响,从而实现功率校准。实验结果表明,星载条件下应用该功率校准过程的反演精度可提高4.5158 m/s,能够有效消除温度对风速反演结果的影响。

In order to further improve the inversion accuracy of sea surface wind speed,the paper proposed a sea surface wind field data processing technology based on GNSS-R:the reason for the power calibration was indicated that the receiver gain changed with temperature to make the received signal power(before being calibrated)affected by temperature,leading to the inconsistent inversion of wind speed under different temperature environments;and the change rule among the temperature and three parameters of the received signal power,the noise power and the noise power when the signal source of load becomes a calibration load was given,then it was analyzed that the influence of the temperature on the power could be eliminated by utilizing the relationship among the three parameters,to realize the power calibration finally.Experimental result showed that under spaceborne conditions,the inversion accuracy using the proposed method would be improved by 4.5158 m/s,illustrating that the effect of temperature on wind speed inversion results could be effectively eliminated.