相对湿度对天顶总延迟量的影响

Influence of Relative Humidity on Zenith Total Delay Solution

针对相对湿度参数对GPS水汽反演精度的影响的存在性,以香港卫星参考站网数据为例,提出了利用GAMIT软件实验分析相对湿度对天顶总延迟量的方法。采用单一控制变量法,分别分析了相对湿度参数设置及其本身对天顶总延迟量解算的影响。结果表明:在相对湿度存在且无误差时,相对湿度参数设置对ZTD解算影响很小。同时,20%的相对湿度误差对ZTD解算影响也不大。而当相对湿度量不存在时,默认的相对湿度设置(50%)引起的ZTD误差较大,在一定程度上会影响GPS水汽反演精度。因此,在有相对湿度量数据时,都应该被使用。

For analysing the influence of relative humidity on the retrieval of precipitable water from GPS solution,GAMIT software was used for solving the Hong Kong satellite reference station network data,and analysing the influence of relative humidity and its different settings on zenith total delay solution.The results show that：Relative humidity parameter setting have little effect on ZTD solver as the relative humidity was present and no error.Also 20%relative humidity error have little effect on ZTD solution.When the relative humidity was not existed,the default setting of relative humidity（50%）would cause a large ZTD error,and affect the accuracy of GPS Water Vapor retrieval to a certain extent.So,if we have the relative humidity data,they should be used.