High-precision tunnel independent-control network establishing method based on existing GNSS control network
An independent control and establishment method technology, which is applied in the direction of instruments, measuring devices, satellite radio beacon positioning systems, etc., can solve the problems of existing project connection, low control network accuracy, and failure of adjacent control points to improve The effect of precision
Active Publication Date: 2019-03-12
CHINA RAILWAY NO 2 ENG GRP CO LTD +1
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[0008] The purpose of the present invention is to overcome the deficiencies in the prior art that the above-mentioned control network itself has low precision, broken links between adjacent control points and cannot be well connected with existing projects, and provide a method that can improve the independent control of tunnels. High-precision tunnel independent control network establishment method based on the existing GNSS control network, which can ensure the tunnel independent control network and the existing design engineering connection at both ends of the tunnel
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Embodiment 1
[0023] Step 1: According to the retest results of GNSS control points in the original design of the tunnel, according to the indicators of small difference from the design coordinates, high relative accuracy of side length, small azimuth error, and small influence of overlapping of adjacent control points as indicators, at the entrance and exit of the tunnel One originally designed GNSS control point is selected at each end as the known point of the independent control network of the tunnel.
[0024] See figure 1 , which is one section of the GNSS control network built by the Railway Design Institute. CPI038~CPI041 is the control range of the long tunnel, and CPI038 and CPI041 are respectively connected with other control points at both ends of the tunnel entrance.
[0025] The coordinate system parameters of the original design GNSS control network are: Beijing 54 coordinate system, the longitude of the central meridian is 113°30′00”, the projection plane is 100m high, the no...
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The invention belongs to the field of engineering measurement and particularly relates to a high-precision tunnel independent-control network establishing method based on an existing GNSS control network. By decreasing used originally-designed GNSS control point coordinates serving as balancing constrained points, originally-designed projective plane elevation is changed to establish a tunnel independent-control network. The method comprises the following steps that known points are selected; the control network is established; a projective plane is calculated; control points are linked; the tunnel independent-control network is made corresponding to an originally-designed GNSS control network and is smoothly connected with a building adjacent to a tunnel access to complete high-precisiontunnel independent-control network establishment. The method has the advantages that the precision of the tunnel independent-control network is improved, the breakthrough precision of a tunnel projectis ensured, the network can also be smoothly connected with existing designed projects at two ends of the tunnel, and the method is suitable for high-precision tunnel independent-control network establishment of all existing GNSS control networks.
Description
technical field [0001] The invention belongs to the field of engineering survey, in particular to a method for establishing a high-precision tunnel independent control network based on the existing GNSS control network. Background technique [0002] In the initial stage of survey and design of a railway, the plane control measurement should be arranged according to the principle of step-by-step control. In the original design, the projection zone is generally divided into a long tunnel to establish an independent engineering coordinate system, and the central meridian of the coordinate system and the height of the projection surface are given. Each opening is designed with 2 to 3 GNSS control points (CPI, CPII). The control points at both ends of the opening or an extended section of control points are used as common points to connect with the control points of the coordinate system of the adjacent projection zone. The construction unit is retesting the original design accord...
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IPC IPC(8): G01S19/14
CPCG01S19/14
Inventor 段太生郭平王靠省周适江华刘立正杨维裕何军
Owner CHINA RAILWAY NO 2 ENG GRP CO LTD