基于球谐函数建模的单站接收机硬件延迟算法

Single station DCB modeling algorithm based on spherical harmonics

在电离层建模过程中,要想获取准确的电离层TEC信息,必须剔除硬件延迟的影响。利用4阶球谐函数建立单站电离层延迟模型,求解球谐函数系数的过程中解算硬件延迟值。在建模过程中针对单站模型卫星与接收机硬件延迟较难分离的问题,直接将广播星历中播发的TGD参数作为卫星硬件延迟,观测值采用载波相位平滑伪距,通过实验验证该方法的有效性。

In order to obtain the accurate ionosphere TEC intormatlon m the ionosphere moaelmg process, the effects of hardware delay must be removed. In this paper, a single station ionospheric delay model based on 4-order Spherical harmonics has been set up. The spherical harmonics coefficients and the hardware delay have been calculated at the same time. To separate satellite and receiver hardware delay in the process of modeling for single station, the TGD parameters in broadcast ephemeris are directly used to obtain satellite hardware delay, and the observation values by using phase smoothing pseudorange. The effectiveness of the algorithm is verified through experiments.