Study on Feasibility of Real time Retrieval of Precipitable Water Vapor Based on Ultra-rapid Ephemeris
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摘要: 从GPS气象学实际应用的角度出发,能够实时获取高时空分辨率的大气水汽场是一个十分关键的问题。基于地基GPS遥感水汽的原理,利用香港地区CORS网的实际测量数据进行试验,根据IGS网站提供的不同精度的轨道信息设计了试验方案,并且比较了方案中最终精密星历、超快速星历以及气象探空站探测得到的大气可降水量序列。实验结果表明,利用超快速星历反演算出的大气水汽总量与最终精密星历一致,其精度可以满足气象预报等实时业务的需求。Abstract: From the perspective of the practical application of ground-based GPS meteorology, it is a critical problem to obtain the atmospheric water vapor field of high spatial and temporal resolution in real time. Based on the principle of ground GPS water vapor remote sensing using Hong Kong CORS network of actual measuring data, according to the different precision of the orbit of IGS web site provides information design the experiment scheme, this paper compares the schemes of precise ephemeris, eventually ultra-rapid ephemeris and meteorological sounding station PWV sequence detection. The results show that the predicted PWV data of the ultra-rapid ephemeris agree with those of the final precise ephemeris, and its accuracy can meet the real-time business needs, such as weather forecasting.
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