地球重力场模型及其在隧道测量中的应用

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1、西南交通大学硕士学位论文地球重力场模型及其在隧道测量中的应用姓名：肖荣健申请学位级别：硕士专业：大地测量学与测量工程指导教师：范东明20070331西南交通大学硕士研究生学位论文第Ⅱ页Abstract舡oneofthemostactiveareasofresearchofthephysicalgeodesy,theaccuracyandresolutionoftheearthgravityfieldmodelhasachievedamajorbreakthrough,especiallyontheimpr

2、ovementofthegroundandtheairofgravitymeasurementtechniques，andnewmethodsofsatellitegravitymeasurementsrealized．Asthemostadvancodmodels，EGM96hasreacheddecimeter-class．UsinglocalandglobalgravityfieldmodelsCallresolveeachgravityfield，whichcanconvenientlyandqu

3、icklycalculategeoidsundulation,gravityanomaly,deflectionofthevertical。disturbancesgravityandothergravitationalfieldparameter．Suchtheoreticalandpracticalapplicationofadvantage，makelocalandglobalgravityfieldmodelsinabroadareaofdisciplinesandapplicationsinge

4、odesy,geophysics，geodynamics，oceanography,spacescienceandmilitaryapplications．Thispaperdescribesthedefinitionandintensionoftheearthgravityfieldmodel，andintroducestheprocessofdeductingexpressionsofthee盯fllgravityfieldmodelwithsphericalharmonicfunctionindet

5、ail．Thecalculationoftheheightanomaly,gravityanomalyanddeflectionoftheverticalofanarbitrarypoimwithEGM96isintroducedandseveralkindsofmethodsforcalculatinggeopotentialcoefficientsoftheearthhavebeensummedup．Thispaperintroducesthepresentsituatiomandtechnicalm

6、odelsforrefiningprovincial(municipat)gcoidsinchina,anddiscussesthereductionofsurfaceobservations．Thepaperrealizesthevisualizationoftheearthgravityfieldmodel．Basedontheabovetheory，usingsevenpoints’dataofthehorizontalcontrolnetworkoftheErlangmountaintunnel，

7、wecancomputethedeflectionsoftheverticalofthecontrolpoints，andaccordingtOconversionofthesurfacedirectionobservations，havecalculatedandanalyzedinfluenceofthedeflectionsoftheverticaltOhorizontalcontrolsurvey．Kcywords：deflectionofthevertical；heightanomaly；gra

8、vityanomaly；earthgravityfieldmodel西南交通大学硕士研究生学位论文第1页第1章绪论1．1研究背景地球重力场是运用物理方法来表征地球形状的一种间接方法，它可以反映在一定的时间和空间内地球内部及外部物质的分布状况并精化大地水准面的形状。测定和研究重力场是大地测量学的一个重要分支，是现代大地测量重要的理论和技术基础。目前，随着人类对重力场了解的不断深入，重力场信息将作为“数字地球”的重要物理信息在大地