一种利用加窗LSSVM拟合GPS在轨卫星钟差的算法

An In-orbit GPS Satellite Clock Errors Fitting Algorithm Based on Windowed LSSVM

利用最小二乘支持向量机(least squares support vector machine,LSSVM)来对GPS在轨卫星钟差数据进行拟合,针对LSSVM拟合钟差两端发散的现象,利用加窗的方法进行抑制。采用IGS提供的精密钟差进行算例分析,发现加窗LSSVM钟差拟合算法比现有的钟差拟合算法精度更高,且基于多项式的核函数比较适合加窗LSSVM钟差拟合。

We put forward a method of using LSSVM to fit the satellites＇ clock error data,and give the concrete step of the method.For the both ends dissipate phenomenon,we make use of the method of adding window to improve accuracy.The calculate example using the clock error data from IGS shows that the add window LSSVM method has higher accuracy than the existing method,and the polynomial kernel function is the better kernel function than others.At last,we use the adding window LSSVM to fit the clock error data of different satellite clocks.