A Non-Parametric Real-Time Coordinate Transformation Method Applicable to CORS
In practical surveying production,the use of inde-pendent coordinate systems,due to their confidentiality char-acteristics,cannot be applied in the network RTK (Real time Kinematic)due to their confidentiality characteristics,making it difficult to meet the system design requirements of real-time and high-precision positioning of the Continuous Operating Reference Station (CORS) system in cities. This article pro-poses a method that combines seven parameter fitting and grid correction to decompose the elements of a confidential inde-pendent coordinate system into parameter models and grid models,and non-parameterize the parameters to achieve de-classification. Subsequently,the grid corresponding to the pa-rameters is sent to users in real-time through the CORS sys-tem to achieve non-parametric coordinate conversion. Users can use this method to obtain high-precision urban indepen-dent coordinate system coordinates in real-time. The actual measurement results of CORS in Xining area show that the ac-curacy of the obtained local coordinate system based on this method is about 0.054 m in urban area and 0.022 m in the whole,achieving the requirement of confidentiality without significantly affecting the coordinate results.
coordinate transformationCORSindependent coordinate system
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