本文選題：CGCS2000 + 地心運動　； 參考：《遼寧工程技術(shù)大學》2014年碩士論文

【摘要】：自20世紀80年代,隨著空間大地測量技術(shù)(VLBI、SLR、LLR和DORIS等)的迅猛發(fā)展,特別是全球?qū)Ш叫l(wèi)星系統(tǒng)(GNSS)技術(shù)的日臻成熟,建立和維持全球/區(qū)域地心坐標系統(tǒng)己經(jīng)成為現(xiàn)實。地心坐標系統(tǒng)的原點位于總地球橢球中心(地球質(zhì)心),橢球旋轉(zhuǎn)軸指向協(xié)議地極,起始大地子午面與零子午面重合,即x和z軸的定向由某一歷元的EOP確定,y軸與x軸和z軸構(gòu)成空間右手直角坐標系。由于地球上發(fā)生的運動和形變十分復雜,因此我們只能在一定量級上對一些影響較大且有規(guī)律的因素加以模擬并改正,從而建立并維持一個達到一定精度的地球參考框架。以ITRF為代表的高精度地心參考框架的維持需要考慮板塊運動(主要沿水平方向),冰期后地殼均衡調(diào)整(主要沿垂直方向),地殼構(gòu)造形變,地表負載變化以及地球質(zhì)心運動。地球質(zhì)心(以下簡稱地心)是指整個地球系統(tǒng)的質(zhì)量中心CM(center-of-mass),包括固體地球和覆蓋在固體地球表面的液體層(包括海洋、大氣、陸地上的河流、湖泊及冰川等)。地心運動是由地球各圈層的物質(zhì)運動所引起的,全球大氣、海洋和地表水的季節(jié)性變化是地球質(zhì)心周年運動的主要地球物理機制,因此可通過這些地球物理因素的季節(jié)性變化來較好地反演地心的周年運動。此外,地心運動還有長周期分量,這是由于冰期后地殼均衡調(diào)整所引起的。因為地心坐標系統(tǒng)的原點定義在地心,地面點的坐標是相對于地心的位置確定的,所以地心的位置變化必然會引起地面點坐標的改變,地心運動將成為動態(tài)地心參考框架維持中需要考慮的重要因素。本文基于地表負載理論,分別利用IGS所提供的全球范圍內(nèi)的IGS05框架點的位移、ECCO模型所提供全球范圍的分辨率為1.O°×1.O°的海底壓強數(shù)據(jù)和NCEP所提供的全球范圍的分辨率為2.5°×2.5°的大氣負載數(shù)據(jù),研究地表質(zhì)量負載變化所引起的固體地球形變,以及由此所產(chǎn)生的地表重力場的變化,進而反演得到了近10年和12年地心位置變化時間序列,并利用功率譜分析的方法探測了地心運動的周期項,最后分別擬合得到了地心運動年周期項的振幅和相位。
[Abstract]:Since the 1980s, with the rapid development of space geodetic technology (VLBIN SLRLLR and DORIS etc.), especially the global navigation satellite system (GNSS) technology, the establishment and maintenance of global / regional geocentric coordinate system has become a reality. The origin of the geocentric coordinate system is located at the center of the ellipsoid of the total earth (the center of the earth's mass). The axis of rotation of the ellipsoid points to the agreement of the earth pole, and the initial meridional plane coincides with the zero meridional plane. In other words, the orientation of x and z axis is determined by EOP of a certain epoch to form a right-hand coordinate system with x axis and z axis. Because the movement and deformation on the earth are very complex, we can only simulate and correct some influential and regular factors in a certain order of magnitude, so as to establish and maintain a frame of reference for the earth with certain precision. The maintenance of high precision geocentric reference frame represented by ITRF needs to consider plate movement (mainly along horizontal direction), postglacial crustal equalization adjustment (mainly along vertical direction), crustal tectonic deformation, surface load change and earth centroid movement. Earth centroid (hereinafter referred to as geocentric) refers to the mass center CM (center-of-mass) of the whole earth system, including solid earth and liquid layer covering the surface of solid earth (including ocean, atmosphere, rivers, lakes and glaciers on land, etc.). The geocentric motion is caused by the movement of matter in every layer of the earth, and the seasonal variation of the global atmosphere, ocean and surface water is the main geophysical mechanism of the annual motion of the earth's centroid. Therefore, the seasonal variation of these geophysical factors can be used to better invert the annual motion of the geocentric. In addition, the geocentric movement has a long period component, which is caused by the postglacial crustal equilibrium adjustment. Because the origin of the geocentric coordinate system is defined in the geocentric, the coordinate of the ground point is determined relative to the geocentric position, so the change of the geocentric position will inevitably lead to the change of the ground point coordinate. Geocentric motion will be an important factor to be considered in the maintenance of dynamic geocentric reference frame. This paper is based on the theory of surface load. Using the global IGS05 frame point displacement and ECCO model provided by IGS, respectively, the global pressure data with a resolution of 1.0 擄脳 1.O 擄and the atmospheric load data with a global resolution of 2.5 擄脳 2.5 擄provided by NCEP are obtained, respectively. The deformation of solid earth caused by the change of surface mass load and the change of ground gravity field are studied, and the time series of geocentric position change in recent 10 and 12 years are obtained. The periodic term of the geocentric motion is detected by power spectrum analysis, and the amplitude and phase of the annual period term of the geocentric motion are obtained respectively.
【學位授予單位】：遼寧工程技術(shù)大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：P228.4

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