实测板块运动模型修正导航系统监测站坐标精度分析

ACCURACY ANALYSIS BY USING PLATE MOTION MODEL MEASURED TO AMEND MONITOR COORDINATES OF SATELLITE NAVIGATION SYSTEM

为了解决卫星导航系统各类地面站的坐标修正问题,必需精确给出各个地面站受地壳板块运动引起的位置变化速度。采用中国地壳运动观测网GPS观测数据计算的实测速度场,利用滑动欧拉矢量建模法建立局部虚拟的板块运动模型,并对虚拟板块运动模型计算的测站速度场的精度进行了分析,结果表明,在东西方向的精度为2.092 mm/a,在南北方向的精度为2.072 mm/a,在点位分布较少的地区和我国边界地区,其精度并没有明显降低,据此指出,该模型可用于我国卫星导航系统各类地面站的坐标修正。

In order to solve various types of coordinates amendment problems of monitor stations in satellite navigation system,it is necessary to accurately give the change rate of the position for each ground station caused by the plate movement.The measured velocity fields computed from GPS observation data of China Crustal Movement Observation Network was adopted,and established virtual local plate motion model by using sliding Euler vector modeling,accuracy analysis shows that the result in the east-west direction has the accuracy of 2.092 mm / a,in the north-south direction has the accuracy of 2.072 mm / a,in sparsely distributing areas and border of China,the accuracies are not significantly reduced.So the model can be used to amend the coordinates of various types of ground stations in China’s satellite navigation system.