The content of this article comes from the "Surveying and Mapping Bulletin" No. 3 of 2024, drawing review number: GS Jing (2024) No. 0499
Research and practice of ultra-long-distance cross-river elevation measurement technology based on Beidou
Liang Yong1,2, Liu Chaosong1
1. China Railway Design Group Co., Ltd., Tianjin 300250, China;2. Tianjin Key Laboratory of Rail Transit Navigation and Positioning and Space-Time Big Data, Tianjin 300250, China
Funds: Science and Technology Development Project of China Railway Design Group Co., Ltd. (2020YY240506; 2021A240504)
Key words: ultra-long distance, cross-river level, elevation anomaly change rate, second-class level measurement
Citation format: Liang Yong, Liu Chaosong. Research and Practice of Ultra-long-distance Cross-river Elevation Measurement Technology Based on Beidou[J]. Bulletin of Surveying and Mapping, 2024(3): 151-155. DOI: 10.13474/j.cnki.11-2246.2024.0326
Abstract:At present, the commonly used cross-river elevation measurement methods include leveling, ranging triangulation elevation measurement, and GNSS measurement. The conventional leveling line of sight is short, and the triangular elevation measurement of ranging has very high requirements for site conditions, requiring the measurement points to communicate with each other and observe in the opposite direction synchronously, and the measurement accuracy is greatly affected by wind, atmospheric refraction, and distance, and with the increase of the measurement distance, the influence of perpendicular deviation also increases, resulting in the reduction of accuracy. When the span is more than 3500m, there is no relevant standard specification to follow, and it is a big challenge for the ultra-long-distance cross-river elevation transfer measurement with a span of more than 10km. In this paper, the method of elevation measurement of ultra-long-distance cross-river project is studied. Firstly, the basic principle of the Beidou-based cross-river leveling method was introduced. Then, taking the elevation transmission across the Yangtze River in the Chongtai River Tunnel of the Shanghai-Chongqing-Rong High-speed Railway as an example, the layout method of the level control network, the quality control of field measurement, data processing and accuracy analysis in the implementation of cross-river level measurement are described. [JP+1] The practical results show that in the survey area with relatively flat terrain and relatively flat rate of change of elevation anomaly, the accuracy index of internal and external compliance can meet the requirements of second-class level measurement by laying mandatory observation piers, optimizing the design of the control network shape, and adopting the cross-river leveling method of double survey lines. In this paper, the application of 10.2km ultra-long-distance cross-river leveling technology in the second-class transmission of the Chongtai River Tunnel of Shanghai-Chongqing-Rong High-speed Railway has been successfully realized, which has a good reference significance for similar engineering projects.
About author:LIANG Yong (1979—), male, master's degree, senior engineer, mainly engaged in railway precision engineering surveying, Beidou satellite positioning surveying, automatic deformation monitoring and other research. E-mail:[email protected]
First trial: Ji Yinxiao review: Song Qifan
Final Judge: Jin Jun
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