基于加权平均温度模型改进的上海市GPS可降水量反演  

Study on improved weighted mean temperature model for retrieval of precipitable water vapor by using GPS data in Shanghai

作　　者：赵海兰[1] 谢亚楠[1] 于春艳[1] 张瑞[1] 

机构地区：[1]上海大学特种光纤与光接入网省部共建重点实验室,上海200072

出　　处：《工程勘察》2014年第2期73-77,共5页Geotechnical Investigation & Surveying

基　　金：上海市科委科技攻关计划(11511501902)

摘　　要：GPS可降水量反演的本质是利用GPS观测数据o文件解算出垂直方向上传播信号的湿延迟量，并将湿延迟量转换为可降水量，这两个参数的转换需由加权平均温度（Tm）来完成。本文利用上海市2012年1月～12月的地面和高空探测资料采用MATLAB编程拟合出适合上海市的Tm与地面温度（T3）的关系式，并反演了受台风“海葵”严重影响的2012年8月上海地区可降水量。结果证明，该Tm和T3的关系式不仅弥补了探空数值积分法的缺点，而且能使GPS可降水量反演的转换误差控制在3mm以内。The essence of retrieval of precipitable water vapor based on GPS is to calculate the wet delay of the vertical direction GPS signal from o files of GPS observation data and convert it to preeipitable water vapor, but the weighted average temperature （Tm） must be used in the conversion. This paper fits out the relation line between ground temperature （Ts） and Tm by using ground and high sky detection data in Shanghai from January to December in 2012 by using MATLAB software and inverts the precipitable water vapor in August 2012 which was affected seriously by the typhoon ＂ HAIKUI＂. The results show that the obtained relationship between Tm and To can overcome the disadvantage of non-real time sounding numerical integral method and improve the accuracy of the conversion to be less than 3mm.

关 键 词：可降水量反演 湿延迟量 加权平均温度 转换误差 

分 类 号：P228.4[天文地球—大地测量学与测量工程]