基于小波分析的桥梁GPS动态监测方法  

GPS Dynamic Monitoring in Bridge Based on Wavelet Analysis

作　　者：何广源[1] 何秀凤[2] 吴迪军[1] 李剑坤[1] 

机构地区：[1]中铁大桥勘测设计院有限公司,湖北武汉430050 [2]河海大学卫星及空间信息应用研究所,江苏南京210098

出　　处：《测绘科学技术学报》2010年第6期399-402,共4页Journal of Geomatics Science and Technology

摘　　要：通过对不同试验方案GPS数据结果进行Fourier频谱分析,所得该桥主频结果均与有限元计算值吻合。研究表明,GPS技术是大跨度桥梁结构主频识别的一种可靠手段。根据先验频谱信息,提出了一种基于中心频率和采样率结合的小波分解层数确定方法。成功地分离出南京长江三桥GPS结果中幅度值仅为mm级的桥梁振动信号。Based on fourier spectral analysis technology, the different schemes data is studied for the main frequency of the 3rd Nanjing Yangtze River Bridge and verified by the finite element method, results show that GPS is a reliable means for identifying the main frequency of long-span bridges. According to the spectrum, an method of determining the decomposition level was proposed based on the center frequency and data sampling rate, and the method can effectively extracts the mm size of the bridge vibration signal from the GPS original data.

关 键 词：全球定位系统 大跨度桥梁 动态监测 频谱分析 小波分析 

分 类 号：P228[天文地球—大地测量学与测量工程]