基于奇异谱分析的地基GPS反演可降水量可行性分析

对微波辐射计观测与地基GPS反演的可降水量数据分1个长时段和2个短时段进行奇异谱分析，提取两种数据在不同时段的主体趋势及周期项,验证地基GPS反演可降水量的可行性。结果表明，与微波辐射计观测数据相比，地基GPS反演可降水量数据均方根误差在2 mm左右，主体趋势具有较强的相关性，周期相同或相近，利用地基GPS反演可降水量是可行的。

Feasibility Analysis of Precipitable Water Vapor Retrieval with Ground-Based GPS Based on Singular Spectrum Analysis

In order to verify the feasibility of precipitable water vapor(PWV) retrieval with ground-based GPS in the way of spectrum analysis, PWV value calculated from ground-based GPS and microwave radiometer(MWR) data are studied in a long period and two short periods, based on singular spectrum analysis(SSA). The major trends and cycles can be extracted from those two kinds of data in different periods. The results show that RMSE of PWV value calculated from ground-based GPS and MWR value is about 2 mm. Between the two kinds of data, there is a strong correlation in major trends and similarity in cycles. This shows that PWV retrieval with ground-based GPS is feasible.