不同星历条件下大气可降水量反演精度分析

摘要

Aiming at the problem that due to the slow update speed and long delay time of the final precision ephemeris, it is difficult to meet the demand for real-time retrieval of atmospheric precipitable water vapor, the paper proposed a method to replace the final precision ephemeris with fast precise ephemeris or ultra-fast precision ephemeris for inversing the atmospheric precipitable water vapor:the basic principle was analyzed, and the process of the inversion was given;combined with the data from the 335 th to the364 th day of 2017 in Hong Kong Continuously Operating Reference Stations, the accuracy of the retrievals by different methods was verified finally.Experimental result showed that it would be feasible to retrieve atmospheric precipitable water vapor by the data of continuously operation reference station, which could meet the accuracy requirement of weather forecast.%针对最终精密星历更新速度较慢、延迟时间较长,不能满足实时反演大气可降水量的要求的问题,提出一种由快速精密星历或超快速精密星历代替最终精密星历进行可降水量反演的方法:通过分析可降水量反演的基本原理,给出反演的基本流程;并结合香港连续运行参考站2017年第335～364天的数据对不同方法所得结果的精度进行验证.实验结果表明:运用连续运行参考站数据反演大气可降水量是可行的;且在一定的条件下,用快速精密星历或超快速精密星历代替最终精密星历进行可降水量反演也是可行的,能够满足气象预报的精度要求.