Development of Tropospheric Correction Techniques to Optimize Vertical GPS Accuracy

全球定位系统（GPS）卫星提供了一个 精确大地测量的强大新工具。向量 GPS接收器之间的距离现在可以精确到 100公里的水平基线外的一厘米 垂直方向3-5厘米。一个主要 对垂直定位退化的贡献是 对GPS信号的时间延迟的修正不足， 对流层中的水蒸气。“湿路径延迟”可以是 原则上使用水蒸气辐射计直接测量 沿着视线指向GPS卫星。然而，在这方面， 尚未进行确定的视线实验。 该项目将通过以下方式进行确定性的辐射计测试： 在两个永久性GPS站点运行视距仪， 加州。测试将进行两个独立的一个月 在一年中的不同季节举行会议。游戏的目的是 开发湿径延迟校正技术， GPS定位精度。

The Global Positioning System (GPS) satellites provide a powerful new tool for accurate geodetic measurements. Vectors between GPS receivers can now be measured with accuracies of one centimeter out of a baseline of 100 kilometers in the horizontal and 3-5 centimeters in the vertical direction. One major contribution to the degradation of vertical positioning is inadequate correction for time delays of GPS signals caused by water vapor in the troposphere. The "wet-path delay" can be measured directly, in principle, using water-vapor radiometers pointed along the line-of-sight to GPS satellites. However, definitive line-of-sight experiments have not yet been performed. This project will perform a definitive radiometer test by operating line-of-sight meters at two permanent GPS sites in California. Tests will be conducted for two separate one-month sessions during different seasons of the year. The object is to develop wet-path delay correction techniques that optimize vertical GPS positioning accuracy.