GPS多路径效应影响与结构振动的小波滤波筛分研究

当应用 GPS技术进行大型工程结构监测时 ,由于其测定的是监测点的绝对位移 ,且受到诸多因素的影响 ,其中多路径效应和温度变化是主要影响源 ,要想正确分析结构的动力特性 ,首先必须有效地分离结构振动与各类影响项。本文采用小波分析法 ,对坐标序列进行多尺度分解 ,有效地筛分出结构微小振动和各类影响项。通过实际测试数据分析 ,取得了极其满意的效果。||The recent advances in GPS technology recording at 20 samples per second allows reliable monitoring of engineering structure, such as suspension or cable-stayed bridges and tall buildings. But the coordinates conducted from GPS trajectory estimator (i.e. epoch by epoch) usually are affected by many factors, e.g. multi-path and temperature as major. To assess stress and drift conditions of engineering structure one have to separate structure vibrations from other biases. The Wavelet analysis technique has been successfully used for this purpose, and the analysis results from practical data are presented.