用激光测距资料解地球定向参数的模型改进

Improvement of Model for Solving EOP with SLR Data

详细介绍了与SLR观测资料的高精度相适应的解EOP模型的改进,并且在复弧法中使用这个改进模型。当轨道参数为全局量,EOP参数为子弧量时,其中解极移运动Xp,Yp和日长变化率DUT1R的模型的更新,提高了解EOP的精度,特别提高了解DUT1R的精度;同时也提高了整个弧段的定轨精度。在EOP的改进模型中,以周日和半周日为周期的分量虽然对提高EOP本身的精度没有什么帮助,但是对整个弧段定轨精度的提高还是有益的。本文用1995～1999年LAGEOS 1的资料解得的EOP序列精度:Xp达0.43mas,Yp达0.41mas,DUT1R达0.022ms。90天弧长定轨残差好于2cm。

The improvement on solving Earth Orientation Parameters (EOP) model is introduced. The improved model is more conformable to high precision of SLR data and is used in multi-arc method. In the multi-arc method of the orbital elements as global parameters, the EOP as local parameters, the renewing model for solving the polar motion Xp,Yp and the Length Of Day (LOD) is beneficial to improve the solved EOP's precision, in particular to the LOD's precision and the precision of orbital determination at the same time. Increasing the components with diurnal and semi-diurnal periods is not beneficial to the EOP's precision, but is beneficial to the global orbit's precision. Using the LAGEOS-1 SLR data from 1995 to 1999 with the improved EOP's model,the series of EOP is solved. The EOP's precision is as follows: 0.43 mas in Xp, 0.41 mas in Yp, 0.002 2 ms in DUT1R. The mean square root of the 90-day orbit's residuals is less than 2 cm.