The Effect Of Tide Loading On Precise Positioning In China Coastal Areas

According to the displacement theory of the Ocean Tide Loading, Using the Global ocean tide model of CSR4.0,GOT00,NAO99.b,FES2004 were obtained by satellite altimetry and the parameterized regional ocean tide models NAO99JB to research the effects of Ocean Tide Loading on coastal areas in China and calculate the effects of the five ocean models on coastal areas of crustal movement monitoring network base station in China.At the same time,research the effect of atmosphere pressure loading on GPS stations.The main contents are as follows:The fisrt chapter introduces the Ocean Tide Loading and Atmospheric Pressure Loading of stauts, the necessity and significance of the study;The second chapter introduces the basic theory of the loading,including the Earth model,unit point loading Green's function,the load love numbers and displacement of the loading Green's functions theory;The third chapter introduces the phenomenon of the Ocean Tide Loading, method for determining the tide chart ,different tide models and calculated methods of the Ocean Tide Loading;The fourth chapter introduces the effects of Global ocean tide models and the parameterized regional ocean tide models in coastal areas , the effect of Ocean Tide Loading on the zenith delay and construct the chart of regional tide;The fifth chapter introduces the effects of atmosphere pressure loading on the base station;The sixth summarizes the main contents of this dissertation and look into future research work.The main research results:1. On the base of the gains obtained by the former researchers,using data from satellite altimetry obtained high-precision the global ocean tide models to research the effects of the ocean tide loading in coastal areas of China,the results show that using the global ocean tide model, small differences in the inland areas,while quite differences in the coastal areas. 2. Using different ocean tide model calculation shows that the effect of ocean tide loading on the station to show the apparent complexity ,smaller differences in the inland areas and greater differences in the coastal areas, the vertical effect of ocean tide loading were greater than in the other direction.O1,K1 and M2 tidal waves has greater effect in vertical direction,K2 tidal wave has smaller.3. Focus on the parameterized regional ocean tide model in coastal areas of China,the results show that the parameterized regional ocean tide model can better reflect the characteristics of China coastal areas.For NAO99JB model,the deformation can reach centimeter level in coastal areas of China,the regional ocean tide model NAO99JB has integrated into the gamit10.35 software and correct to the coastal tidal areas,ocean tide loading effects on ZTD in the coastal areas can reach centimeter level.Therefore,to accurately estimate the tropospheric delay,should not ignore the effect of the Ocean Tide Loading in high-precision data processing and high-precision GPS meteorology.4. The eight major tidal wave amplitude distribution of the regional ocean tide model NAO99JB was constructed in China.From the figure,we can see a greater impact in coastal areas than inland.For the M2 tidal wave, a greater impact on the ocean loading in low latitudes and Q1 tidal wave smaller.Form coastal to inland, the effect of the tidal wave was smaller.5. Discover the Atmosphere Pressure Loading are related with ocean tide loading and latitude.With the increase of latitude,the increasing influence of atmospheric pressure loading,deformations in the high latitudes can be up to 18mm,while the deformation is relatively small near the equator.The vertical displacement of the crustal deformation caused the atmospheric pressure loading show obvious the characteristics of seasonal variations.