基于历元差分原理的BDS测速模型及性能分析

对现有的载波相位历元差分测速方法进行改进,同时增加伪距历元差分观测值,建立新历元差分测速模型,并用BDS静态数据和动态数据对改进的方法进行验证和性能分析。结果表明,静态条件下,BDS历元差分测速精度为mm/s级,平面方向优于高程方向,与GPS历元差分测速精度相当;动态条件下,BDS历元差分测速结果与IE (inertial explorer)后处理软件解算的位置差分速度符合度为cm/s级,平面方向优于高程方向。

BDS Velocity Estimation and Performance Analysis Based on Time-Difference Model

We build a new time-difference model for velocity estimation based on the existing time-differenced carrier phase technique. In the new model, time-differenced pseudorange observations are included. The static and kinematic data of Beidou navigation satellite system (BDS) is used to verify and analyze the improved method. The results show that the precision of the new time-differenced method could reach mm/s level in static conditions, equal to the GPS precision, and the accuracy of horizontal is better than the vertical. Furthermore, while in dynamic conditions, the mean square statistics of the velocity discrepancies between BDS time-differenced method and IE (inertial explorer) accord with cm/s, and the accuracy of the horizontal is better than the vertical.