GPS桥梁形变监测的半日波信号分析  

Analysis of semi-diurnal wave signal for GPS bridge deformation monitoring

作　　者：袁振超[1] 黄川[1] 李博峰[1] 沈云中[1,2] 

机构地区：[1]同济大学测量与国土信息工程系,上海200092 [2]国家测绘局现代工程测量重点实验室,上海200092

出　　处：《工程勘察》2009年第7期45-47,66,共4页Geotechnical Investigation & Surveying

基　　金：自然科学基金资助项目(40674003)

摘　　要：本文根据东海大桥从2006年9月19日至11月15日的GPS监测数据,通过傅立叶变换发现明显的半日波信息,用最小二乘谐估计分析了半日波的成因主要是多路径效应,其数值约为1.5cm;只有在大潮前后,潮汐对桥面竖向位移也有较为明显的半日波信号,此时为两种因素引起的半日波信号的叠加。According to the GPS measurement of Donghai-Bridge from Sept. 19-Nov. 15, 2006, the semidiurnal wave signal was obviously found by flourier transform method and its cause analyzed by the least-square harmonic estimation. The main factor of this semi-diurnal signal was multi-path effect and its value about 1.5cm. But, only in the high tide time, the effect of the tide on vertical displacement of bridge deck could also cause the semi-diurnal wave signal which was triggered by multi-path effect at the same time.

关 键 词：时间序列 频谱分析 最小二乘谐估计 半日波 

分 类 号：P228.4[天文地球—大地测量学与测量工程]