Dynamic GPS monitoring data processing based on EMD
Wang Ha · Engineering of Surveying and Mapping · 2015
When GPS is used to monitor a large span bridge in the operation period,because of being affected by the traffic load and the observation noise,the vibration signal(mm level)of GPS monitoring is completely obliterated.Thus how to extract the deformation information and the vibration characteristics of bridge from the GPS monitoring series is an important content of the bridge health monitoring.This paper uses the EMD method to process GPS monitoring series,and gets a certain number of intrinsic mode function(IMF).With selecting the specific IMF signal reconstruction and power spectrum analysis,the bridge deformation information and vibration characteristics are obtained.Compared with the traditional FFT method,it can accurately identify the vibration frequency of the structure of bridge,and at the same time extract the deformation characteristics.