Establishment and Data Analysis of GNSS Control Network of Rail Transit
[Purposes]This paper aims to study the layout method and data analysis and processing of the first level GNSS control network for urban rail transit,thus summarizing project experience.[Methods]Combined with the specification requirements of the first-level GNSS control measurement of urban rail transit plane and the actual situation of the project,and taking the establishment and data processing of the GNSS control network for Line 4 of a certain city's rail transit as an example,the hierarchical layout of the frame network and the line network is adopted.The main accuracy requirements of the subway GNSS control network,the principle of measuring point layout,the field collection process,data processing flow,quality inspection and other methods are introduced.[Findings]When laying out the control network,it is advisable to conduct joint measurement with the overlapping points of the adjacent line control network.The selection of point positions should not only comply with the requirements of the specifications,but also be coordinated with the line direction and construction,and should be connected with the adjacent line control points to ensure the accuracy of point positions;During the data processing process,special attention should be paid to the accuracy of synchronous and asynchronous loops.For important parts such as long baselines and control points near stations,measurement robots can be used for edge length observation and correction.[Conclusions]The layout of the first level GNSS control network for urban rail transit is a time-consuming and laborious process,and data analysis and processing require high ex-perience from technical personnel.The control network measurement can well meet production require-ments and has certain guiding significance for similar projects.
GNSS control network deploymentframe networkline networkdata processrail transit
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