中文摘要：

当测站与周围环境完全不变时，GPS多路径效应具有很强的重复性。为分析变形测量中的GPS多路径效应特征，利用模拟振动台进行振动测量实验。结果表明：动态变形监测中的多路径效应误差序列中出现了多个频率的高频跳动，其中主要频率与振动频率相近，使得其重复性明显降低，但其低频部分仍然具有一定的重复性；利用具有重复性的低频部分建立多路径效应误差改正模型，可使GPS的振动测量精度提高30％左右。

英文摘要：

The muhipath effect has strong repeatability when the surveying point and its surroundings keep unchanged. In order to analyze the property of the muhipath effect in GPS for deformation observation, a vibration measurement test is carried out by use of a simulation vibration table. The results show that there are some jumps of high frequency in the muhipath error series and its main frequency is near to the vibration frequency of the table, thus it makes the repeatability down, but in the part of low frequency. After the muhipath correction using the part of low frequency which has a certain repeatability, the accuracy of GPS measurement can be improved about 30%.