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《Science of Surveying and Mapping》 2017-01
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The research of vertical ocean tidal loadings inversion of marine constituents based on HHT

WU Zhilu;LIU Yanxiong;HE Xiufeng;FENG Ying;PENG Lin;FAN Shijie;The First Institute of Oceanography,SOA;Hohai University;China University of Petroleum;  
This paper lays emphasis on the lack of the research of deriving the ocean tide loading(OTL)character,which based on the costal GPS sites,using FFT and HHT to drive OTL character.Two types of spectrum analysis are different,but both can derive the target information from original data.Based on the position time series of China costal GPS sites time series,after wavelet filtering,we use two spectrum analysis methods to derive OTL character and comparing with the result from three global ocean loading models to assess the precision.The study shows that:Both FFT and HHT can detect the ocean sub-tides precisely,FFT is better than HHT of the diurnal tides and the precision of semi-diurnal they are the same;The amplitude from HHT is relative value that represents the possibility of some frequency,they can't be compared with the models,while the amplitude derived by FFT is absolute value,FFT/model has a good agreement;When detecting unknown signal,using FFT may detect the some fake signal while HHT can show the truly constitution of the signal.
【Fund】: 国家自然科学基金项目(41374044 41274011);; 国家海洋局预报减灾司项目(1511311700008)
【CateGory Index】: P228.4
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