隔河岩大坝外观变形数据的处理和分析

Data Processing and Analysis of GPS Automatic Monitoring System of Outside Deformation for Geheyan Dam

提出综合采用滤波、整体平差的数据处理方法 ,使大坝形变监测精度得到了很大的改善。通过具体算例表明 ,该方法能大幅度提高大坝形变监测精度 ,从而验证了该方法的正确性与可行性。

The precision of GPS monitoring deformation for Geheyan Dam is much lower than that of others under the ordinary conditions.Therefore,how to process the data of Geheyan Dam is not only a difficult task,but also a real challenge for us. By analyzing the results of another reference station,GPS2,we found that there are some differences among the ones of each session,thus it can be seen that there are some errors in the procedure of data processing.It is difficult to deal with these errors.On second thoughts,we compute the relative coefficients of GPS2 for each deformation monitoring station,and get a fact that there are strong relativities among GPS2 and monitoring stations.Therefore,we can use the data of GPS2 to lower or eliminate the errors of the deformation monitoring stations. Based the above,we put forward the method as follows:First,make the best use of a mass of raw data owing to around_the_clock observation and use Filtering Method to get rid of gross errors and noises of the deformation monitoring stations.Second,use Integral Adjustment Method to get the results.It is the critical approach to get a good result.We adopt different weight values for different types of stations,the deformation monitoring stations are endowed with small weight values;GPS2 is endowed with relative to much bigger value;and GPS1 is endued with infinite,i.e.GPS1 is fixed.We cite an example in this paper which proves that the above method is right and feasible.