小波分析辅助GPS-R潮位反演

Tide level inversion using wavelet analysis assisted GPS-R

针对使用全球定位系统反射信号测量技术(GPS-R)分离海面直射信号时,低高度角情况下、低阶多项式方法容易出现偏差的问题,提出了一种利用小波分析方法去除直射信号的海面潮位反演算法。通过美国华盛顿州SC02测站2016年年积日(DOY)第92—97天连续6 d观测数据进行验证,结果表明,使用改进的小波分析方法,能够更好地拟合信噪比变化情况,获得更高精度的卫星反射信号;潮位反演精度在L1波段有较小的降低,而在L2波段反演精度有明显的提升。

Aiming at the problem that the low-order polynomial method is prone to deviation when the Global Positioning System-Reflectmetry(GPS-R) technology is used to separate the direct signal from the sea surface at low altitude, a sea surface tide inversion algorithm using wavelet analysis method to remove the direct signal is proposed. The results show that the improved wavelet analysis method can better fit the change of signal-to-noise ratio and obtain more accurate satellite direct signal;the accuracy of tide level inversion is slightly reduced in L1 band, but it is improved in L2 band.