【摘要】 精密和详细测定地球重力场及其时间变化 ,是目前卫星重力测量的主要课题。基于固体潮研究的最新成果 ,研究了固体潮对地球重力场时变特征的影响。不同于IERS2 0 0 3采用的Cartwright和Tayler(1971)的引潮力位(TGP)展开 ,而是利用郗钦文的TGP展开 ,给出了固体潮对地球重力场时变特征影响的理论公式 ,并考虑到 4阶潮汐的效应 ,精度可达到 10 -11ms-2 量级 ,同时采用最新的TGP展开数据重新计算了固体潮Love数相对频率特性对地球引力场的影响 ,并考虑了较多的潮波项 ,最后对重力数据归算中的永久性潮汐的处理进行了总结和说明。更多还原

【Abstract】 It is well known that the earth tide causes the temporal variations of gravitational field.We have improved the theoretical model by use of 10+{-11}ms+{-2} level tidal formulas from the precise tide-generating potential(TGP) expansion presented by Xi instead of that by Cartwright and Tayler and take the tidal terms of fourth-order into account.In the same time,we adopt the latest TGP expansion to re-calculate the perturbing effect of the relative frequency feature of the Love number of the earth tide on gravitational field and more tidal items have been considered.At last, the processing of the permenent tide in the reduction of gravity data is summarized and explained.更多还原