Method and system for transforming geodetic coordinates into independent plane coordinates in railway survey

Abstract

The invention discloses a method and system for converting geodetic coordinates into independent horizontal coordinates in railway measurement, and the method comprises the steps: S1, resampling is performed on geodetic coordinate series; S2, expansion ellipsoid Guass projection transformation is performed on geodetic coordinate series of a measurement point, and projection plane coordinate series of the measurement point are obtained; S3, distance of a line joining each adjacent two measurement points on a projection plane is obtained; S4, mileage increment of two adjacent measurement points is reduced; S5, rail construction mileage of each measurement point is calculated; S6, graphic design coordinate series of the measurement point under an independent engineering coordinate system are calculated; S7, according to the projection plane coordinate series and the graphic design coordinate series, and parameters of projection plane coordinates converting into the independent engineering coordinate system are calculated. According to the invention, a few priori knowledge is needed in the method, the geodetic coordinates outputted by GNSS / INS navigation system can be precisely converted into the horizontal coordinates under the independent engineering coordinate system, and the complexity of coordinate transformation is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of railway track precision measurement, in particular to a method and system for converting geodetic coordinates into independent plane coordinates in railway measurement. Background technique [0002] Global Navigation Satellite System (GNSS) technology and its integrated navigation technology (GNSS / INS) with Inertial Navigation System (INS) are being more and more widely used in the field of railway surveying and mapping. Using GNSS or GNSS / INS integrated navigation system for orbit measurement, the directly obtained position coordinates are often geodetic coordinates or spatial rectangular coordinates under the earth-centered ground-fixed coordinate system, and the positions of ground points in the geodetic coordinates are represented by longitude, latitude and elevation . In the process of track construction and maintenance, the construction coordinate system or independent engineering coordinate system...

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Problems solved by technology

On the other hand, even if the above six types of parameters are known, such as the scheme described in the invention patent with the notification number CN103343498A, the GNSS base station must be erected on known CPII points for long-term static surveying and mapping to obtain high-precision positioning result; this undoubtedly increases the complexity of the actual operation of the program

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