小波变换后的噪声信息在大坝变形监测精度评定中的应用

评定变形监测精度，除了仪器的标称测量精度外，还应考虑到外界观测条件等随机因素的变化对测量结果的影响，这类影响通常以随机噪声的形式表现在整个变形监测过程中，可利用小波变换提取出来，作为评定变形监测精度的偶然误差部分。以实例进行实验研究，综合考虑了仪器的系统误差以及随机因素引起的偶然误差，客观地评价了变形监测工作的质量。

Application of Noise Information Based on Wavelet Transformation in Evaluating Precision of Dam Deformation Monitoring

In order to assess accuracy of deformation monitoring, we should consider not only measurement accuracy of instrument, but also influences of field condition errors. All these influences exist with random noise during the whole deformation monitoring. We can separate it from observations with wavelet transformation, and assess accuracy of deformation monitoring as random error. Some experiments are done with actual observations, and system error and random error caused by influences of instrument error and random noise are considered. Therefore we can evaluate the quality of deformation monitoring objectively.