資源描述:
《利用grace衛(wèi)星確定地球重力場理論和方法》由會(huì)員上傳分享,免費(fèi)在線閱讀,更多相關(guān)內(nèi)容在學(xué)術(shù)論文-天天文庫。
1、摘要繼美德合作的低低衛(wèi)星跟蹤衛(wèi)星模式的重力衛(wèi)星GRACE順利發(fā)射升空,衛(wèi)星跟蹤衛(wèi)星技術(shù)應(yīng)用于地球重力場的研究真正地全面展開。鑒于有關(guān)方法和技術(shù)尚未成熟,且重力衛(wèi)星在地震監(jiān)測方面的應(yīng)用尚為空白,在此背景下,本論文主要探討了以下幾點(diǎn)內(nèi)容:1、論述了地震監(jiān)測與重力、衛(wèi)星重力的密切關(guān)系,回顧總結(jié)了衛(wèi)星重力技術(shù)的發(fā)展和現(xiàn)有研究成果,并著重介紹了已發(fā)射和即將發(fā)射的三顆重力衛(wèi)星CHAMP、GRACE及GOCE。2、研究衛(wèi)星重力學(xué)所涉及的各種理論知識(shí),包括重力場的基本概念、描述衛(wèi)星軌道運(yùn)動(dòng)所需的各種時(shí)空參考系統(tǒng)的精確定義、數(shù)學(xué)表達(dá),以及衛(wèi)星軌道的一些基本理論。3、詳細(xì)探討了利用能量守恒法
2、恢復(fù)地球重力場的理論方法,分別從經(jīng)典力學(xué)的角度給出了利用單星和雙星能量守恒法恢復(fù)地球重力場的詳細(xì)推導(dǎo)過程。4、較詳細(xì)的介紹了GRACE衛(wèi)星測量系統(tǒng),并對(duì)本論文所要用到的四類衛(wèi)星數(shù)據(jù)—恒星敏感器數(shù)據(jù)、加速度計(jì)數(shù)據(jù)、K波段測距數(shù)據(jù)以及GPS精密定軌數(shù)據(jù)的預(yù)處理進(jìn)行了詳細(xì)的說明。5、從解算重力場位系數(shù)的實(shí)際出發(fā),結(jié)合地震監(jiān)測的目的和需求并考慮各種算法的利與弊,確定了以最小二乘算法進(jìn)行求解。討論了位系數(shù)排列方式與法方程結(jié)構(gòu)特征之間的關(guān)系,針對(duì)實(shí)際需要選擇了相應(yīng)的處理辦法,給出了利用最小二乘解算模型的詳細(xì)步驟,并由此得到60階的重力場模型CEAGM01。6、通過GFZ數(shù)據(jù)中心公布的
3、利用GRACE衛(wèi)星數(shù)據(jù)恢復(fù)的重力場位系數(shù),從全球重力異常圖和重力異常累計(jì)誤差兩方面,對(duì)GRACE衛(wèi)星模式的數(shù)據(jù)應(yīng)用于地震監(jiān)測的可行性作了詳細(xì)分析。關(guān)鍵詞:衛(wèi)星重力;GRACE衛(wèi)星;能量守恒法;全球重力場模型AbstractSincethelaunchofGRACEinlow-·lowSatellite—-to··SatelliteTracking(SST-11)cooperatedbyUSAandGermany,researchofSSTtechniquesforearthgravityfieldhasentirelyspread.Forrelatedmethodsand
4、techniqueswerenotperfect,andtheapplicationofgravitysatelliteinmonitoringearthquakehasbeenblank,inthiscase,themainworksandcontributionsweresummarizedasfollows:l、‰relationsbetweenearthquakemonitoringandgravity、satellitegravitywerediscussed.Reviewandsummarizethedevelopmentandpresentresearchp
5、roductionofsatellitegravitytechniques,especiallyintroducethelaunchedandbeinglaunchedgravitysatelliteCHAMP、GRACEandGOCE.2、Manytheoriesrelatingtosatellitegravityhavebeenresearched,includingthebasicconceptsaboutgravityfield,thestrictdefinitionandmathematicalexpressionsofdifferenttime/spacere
6、ferencesystemsfordescribingthetracksofsatellite,andsomebasictheoriesofsatellitetracks.3、Thekeystonesofglobalgravityfieldrecoveryusingtheenergyconservationhavebeenstudied,respectivelypresentingthededucedprocessusingsinglesatelliteanddoublesatellitesindetail,fromthepointofclassicmechanics.4
7、、TheGRACEsatellitemeasuresystemhasbeenintroduced.Andthepretreatmentofthefourkindsofsatellitedata(SCAlB,ACCIB,KBRlBandGNVIB)wereexplaineddetailed.5、Fromthefactofgravitypotentialcoefficientscalculated,combiningtheobjectiveandrequirementofearthquakemonitoringandconside