利用区域GPS网进行高海拔流动站的对流层延迟量内插

Interpolation Method of Tropospheric Delay of High Altitude Rover Based on Regional GPS Network

提出了一种新的区域对流层延迟量内插方法——投影延拓法。该方法在不损失原有参考站空间结构信息的前提下,避免了由于流动站高程较高所带来的空间内插结构上的畸形。实测GPS数据解算结果显示,当流动站高程比参考站高2 km左右时,该方法获取的对流层延迟改正值精度比现有方法有显著提高。动态实验表明,采用该方法估计的对流层改正值可提高GPS动态定位中高程方向的精度。

Usage of multiple reference stations is an effective method to model regional tropospheric delays,where tropospheric delay at rover station is interpolated from those at reference stations.However,obtaining the high precision delay corrections is difficult when there are large elevation differences between rover stations and reference stations.We present an interpolation method of regional tropospheric delays,which is named as Projection_Extension method.The method avoids the spatial structure deformation due to the high altitude rover station,while keeping all spatial structure information of reference stations.The results show a significant improvement for the interpolation precision with Projection_Extension method,relative to existing methods,when rover station is 2 kilometers higher than the reference stations.And in GPS kinematic positioning experiment,the positioning precision in the height component can be improved by using Projection_Extension method.