高速铁路框架控制网( CP0)的GPS闭合环检验，具有同步观测、异步构环、组合方法多、计算工作量大的特点。目前市面上的商用软件，在多时段异步环的构建方式及闭合环限差的计算方法上，无法满足高速铁路工程测量规范中闭合环检验的要求。本文在分析现有闭合环搜索方法适用性的基础上，使用Delaunay三角网构建闭合环路信息，然后采用时段错位循环组合方法计算三角网异步环闭合差。使用结果表明，该方法可以消除CP 0闭合环的交叉和重叠现象，大幅减少闭合环检验的计算工作量。%The testing method of GPS closed loops on high speed railway CP 0 features simultaneous observation,non-simultaneous observation loop,various baseline combinations and heavy workload in calculation. With regard to the non-simultaneous loop construction for multi-observation sessions and the calculation approach for the limit of error,the commercial software available at present is not able to meet the requirement of closed loop testing defined in the Specifications for survey engineering of high speed railway. Therefore,the studies in this area are of great significance for future practice. Based on an analysis on the existing methods,the paper put forwards a new approach,in which Delaunay's triangulation network is used to create closed-loop information path,then the closing error of non-simultaneous observation loop in triangulation network is calculated by using circulating combinations of shifting observation sessions. The result suggests that this could effectively eliminate the crossover and the overlaps of CP 0 closed loops,and sufficiently reduce the workload in calculation.
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