Development of Tropospheric Correction Techniques to Optimize Vertical GPS Accuracy

开发对流层校正技术以优化 GPS 垂直精度

• 批准号: 9117568
• 负责人: Christian Rocken
• 金额: $ 11.22万
• 依托单位: University Corporation For Atmospheric Res
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-06-15 至 1994-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9117568&HistoricalAwards=false
• 关键词: Development; Tropospheric; Correction; Techniques; Optimize

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.

全球定位系统(GPS)卫星为精确的大地测量提供了一个强大的新工具。GPS接收器之间的矢量现在可以在100公里的基线上以1厘米的精度测量，在垂直方向上可以精确到3-5厘米。垂直定位性能下降的一个主要原因是对对流层水汽引起的GPS信号时间延迟校正不足。原则上，可以使用指向GPS卫星视线的水蒸气辐射计直接测量“湿路径延迟”。然而，还没有进行确定的视线实验。该项目将通过在加利福尼亚州的两个永久GPS站点运行视线计来执行最终的辐射计测试。测试将在一年中的不同季节进行两个单独的为期一个月的课程。其目的是开发湿路径延迟校正技术，以优化垂直GPS定位精度。