观测值层面ITRF解算策略研究

分析了法方程层面ITRF解算不一致的原因和观测值层面组合解算在提高产品一致性方面的优势。在总结观测值层面组合研究现状的基础上，重点对观测值层面组合解算步骤和关键问题进行系统研究。为解决观测值层面组合计算强度大的问题，提出基于分布式处理技术实现组合解算的策略，设计了地球参考框架并行计算的算法和流程。由研究可知，观测值层面组合解算能有效提高产品一致性，分布式处理技术能有效提高参考框架解算效率。

Reserch on Solution Strategy of ITRF at Observation Level

The reason of ITRF computation inconsistency at normal equation level and the advantage of combination computation at observation level are analyzed. After summarizing the research status of combination computation at observation level, the solution procedure and key issues of combination computation at observation level are analyzed. In order to overcome the computing difficulty of combination computation at observation level, the combination computation strategy based on distributed process is advanced. And then the parallel computing flow and method of the ITRF solution are designed. The study results show that the ITRF solution strategy at observation level can improve the product consistency and the distributed process technique can improve the efficiency of ITRF solution.