一种附加边界约束和内约束的多中心ERP融合模型

不同技术、不同分析中心得到的地球自转参数（Earth rotation parameters，ERP）往往是不同的，为提供统一的ERP供用户使用，常需对ERP进行融合处理。提出了一种基于多分析中心ERP结果的附加边界约束和内约束融合模型，即先通过参数变换把各分析中心结果转换到相同时刻，考虑到相邻观测时段边界点处ERP应当一致这一特点，施加边界约束，然后对各分析中心的长期解施加转换参数内约束，最后得到多分析中心ERP的融合解。采用从2005—2011年共6 a的7个全球卫星导航系统（Global Navigation Satellite System，GNSS）分析中心的结果进行融合处理，并与IERS C04（International Earth Rotation and Reference Systems ServiceCombined 04）结果进行比较。结果表明，所提出的融合方法计算结果的精度有明显改善。

A Fusion Model for ERP Considering Boundary Constraints and Inner Constraints

The ERP (Earth rotation parameters) obtained by different technologies and different analysis centers are often different. In order to provide unified ERP for users, it is often necessary to fuse the ERP by using a special method. In this paper, an additional boundary constraints and internal constraints fusion model based on the ERP results of multi-analysis center is proposed. Firstly, all the analysis center results are converted to the same time by using the parameter transformation model and the boundary constraints are applied to the same characteristic points on the boundary point of the adjacent observation period. Then the inner constraints of the transformation parameters are applied to the long-term solutions of the analysis centers, and the fusion solutions of the ERP are obtained. Using SINEX (solution independemt exchange format) files from seven GNSS (Global Navigation Satellite System) analysis centers of six years from 2005 to 2011, their results are integrated and analyzed. Compared with the results of IERS C04 (International Earth Rotation and Reference Systems Service Combined 04), the results of the fusion method proposed in this paper have been significantly improved.