GPS系统硬件延迟估计方法及其在TEC计算中的应用

给出了用于估计GPS系统硬件延迟的卡尔曼滤波的状态方程和观测方程，在卫星和接收机相对硬件延迟计算方法的基础上，进一步给出了滤波器初值的计算方法，然后给出了GPS系统硬件延迟和卫星相对于平均值的硬件延迟的计算结果，并对GPS系统硬件延迟及卫星和接收机硬件延迟的稳定性进行了评价，结果表明，在两个半月的时间里，它们是非常稳定的，最后通过TEC的计算结果及其与滤波估计的比较证明了本文方法的正确性.

A METHOD FOR ESTIMATING GPS INSTRUMENTAL BIASES AND ITS APPLICATION IN TEC CALCULATION

In this paper the state equation and measurement equation of Kalman filtering for estimating GPS instrumental biases are presented. The method for calculating the initial value of the filter is also provided based on the calculation method of the relative instrumental biases of satellite and receiver. The GPS instrumental biases and the satellite instrumental biases relative to the mean is calculated,and the stability of the GPS instrumental biases and the satellite and receiver instrumental biases is evaluated. The results indicate that they are very stable during a period of two months and a half. Finally,the validity of the method is verified by the calculated results of TEC and the comparison between the calculated TEC and the estimated TEC.