摘要
本文根据现代空间技术测定地球引力场变化的进展 ,提出了用实测的地球自转参数和实测的低阶重力场变化结合的方法以研究地球角动量变化。其突出的优点是可以使引起地球角动量变化的质量项和速度场项解耦 ,使原来较复杂的问题简化。作为本文提出的方法的实例 ,我们用 L ageos-1和 Lageos-2两颗卫星的 SLR资料求解 ΔC2 0 ,计算出 ΔLOD序列 ,与(ΔLOD-Wind)残差序列相比 ,有较好的一致性 ,显示出本文方法的有效性。
According to the development of determination of geopotential by space geodesy, a combined method using Earth rotation parameters and low degree harmonic coeffcients of geopotential determined by space geodesy is suggested to study the variation of Earth angular momentum. The prominent advantage of this method is that the Earth angular momentum can be decoupled into mass term and velocity term and hence makes a complex problem simplified. As an example of our method, the Lageos-1 and Lageos-2 SLR data are used to obtain the time series of ΔC 20. A good agreement can be achieved between the computed ΔLOD series using C 20 and the (ΔLOD-Wind) residual series, which indicates the effectiveness of our method.
出处
《测绘学报》
EI
CSCD
北大核心
2001年第1期6-9,共4页
Acta Geodaetica et Cartographica Sinica
基金
国家基金! (40 0 740 0 4
498740 0 4
497742 2 9
496 3414 0 )
攀登计划! (970 2 310 0 3)
