对铁路施工期线上GNSS网更新原则的探讨

Discussion on the Renewal Principle of GNSS Network in Railway Construction Period

新建南通至上海铁路一期工程线上CPⅡ复测按照新规范技术要求实施,CPⅡ点按照评判标准更新后,部分更新点的坐标变化与CPⅢ控制网的变化并不协调。通过分析复测中的典型案例发现,线上CPⅡ更新在规范评判原则的基础上,还应增加CPⅢ复测与建网成果的分析来确定CPⅡ成果的采用情况,并扩展至无砟轨道。提出了采用CPⅢ控制网的复测数据更新CPⅡ的方法,以保持CPⅢ基准的统一,减小轨道精调的工作量。

The online CP II repetition survey of Nantong-Shanghai railway is carried out according to the new specification.However,some points which are renewed according to the evaluation criteria,don’t coordinate with the changes of CP III network.Through the analysis of several typical cases in the control network repetition survey project,we found that the update of online CP II should be based on the standard evaluation principle,be added to the analysis of CP III repetition survey and networking results,and be extended to ballastless track.Then,we proposed a method of update CP II with repetition survey data of CP III network,to maintain the unity of CP III results and reduce the workload of track fine adjustment.