不同降雨量对GPS测量影响实验研究

Research on the Impact of Different Rainfall in GPS Measurement

开展了不同降雨量对GPS测量影响分析的实验,通过数据预分析发现,降雨量与GPS测量多路径效应的相关性较弱,影响较小,降雨量越大,周跳越严重。运用GAMIT软件在相同策略下对多天数据进行解算发现,随着降雨量增加,所得到的基线长度有所增大,其影响可达mm级。因此,在高精度GPS测量或IGS站数据联合解算中需考虑降雨因素和IGS站所在环境的降雨状况,以获得更高精度的基线结果 ;而对于一般GPS测量作业,由于观测时间较短,也应考虑降雨影响,或通过延长观测时间降低其影响幅度。

We carried out GPS measurement impact analysis experiments under different rainfall conditions, and found out that a weak correlation on different rainfall and multi-path effects by pre-processing in this paper. We used GAMIT software to process many days of data through the same way. The result shows that, as the increase in rainfall, the length of baseline is increase, and this impact can reach millimeter. Therefore, in the process of high precision GPS survey or alliance calculating of IGS stations data, we must take into account the rainfall factors and rainfall situation where the IGS station, to obtain a more accurate baseline results. For general GPS measurement, because of the short observation time, it should also consider the impact of rainfall, or extend the observation time to reduce the impact.