不同星历产品反演CMONOC/PWV的精度评估

Accuracy evaluation of CMONOC/PWV inversion by different ephemeris products

针对最终精密星历发布延迟时间达14〜18 d,更新时间慢,无法满足气象学中实时反演大气可降水量的要求,提出利用不同星历产品反演大气可降水量并评估其精度:借助中国大陆构造环境监测网络(CMONOC)的观测数据,对比分析最终精密星历、快速星历、超快星历产品对CMONOC解算精度、反演天顶对流层延迟(ZTD)精度及大气可降水量(PWV)精度的影响。结果表明:不同星历产品解算CMONOC的精度相当;最终精密星历产品反演ZTD的精度最高,快速星历产品次之,超快速星历产品精度最低,均方根误差(RMSE)分别为2、8、12mm;最终精密星历产品反演PWV的精度最高,快速星历产品次之,超快速星历产品精度最低,分别优于1、2、4mm,精度都优于1cm,可以满足实时反演大气可降水量的要求,为进行短临天气预报提供参考。

Aiming at the problem that it is not easy to meet the requirement of real-time inversion of atmospheric precipitation in meteorology due to the delayed release of the final precise ephemeris by 14-18 d and the slow update time,the paper proposed to invert the atmospheric precipitable water by different ephemeris products and evalute the accuracy:the observation data of the Crustal Movement Observation Network of China(CMONOC)were used to comparativley analyze the influence of final products,rapid products and ultra-rapid products from International GNSS(Global Navigation Satellite System)Service(IGS)on the accuracy of CMONOC solution,zenith tropospheric delay inversion and Perceptible Water Vapor(PWV)retrieval.Results showed that:the accuracy of CMONOC solution by different ephemeris products would be the same;the accuracy of zenith tropospheric delay inversion by IGS final products could be the highest,followed by that of IGS rapid products,and that of IGS ultra-rapid products could be the lowest,with root mean square error(RMSE)2,8 and 12 mm respectively;for the inversion of PWV,the precision of IGS final products would be the highest,followed by that of IGS rapid products,and that of IGS ultra-rapid products could be the lowest,better than 1,2 and 4 mm respectively,indicating that the precision could be all better than 1 cm,which meets the requirement of the real-time retrieval of atmospheric precipitable water,and provides a reference for short-term and imminent weather forecast.