Direct transformation of coordinates for GPS positioning using the techniques of genetic programming and symbolic regression

Authors:
Chih-Hung Wu;Hung-Ju Chou;Wei-Han Su
Affiliations:
Department of Electrical Engineering, National University of Kaohsiung, Kaohsiung, Taiwan;Department of Electrical Engineering, National University of Kaohsiung, Kaohsiung, Taiwan;Department of Information Management, Shu-Te University, Kaohsiung County, Taiwan
Venue:
Engineering Applications of Artificial Intelligence
Year:
2008

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Abstract

Transformation of coordinates usually invokes level-wised processes wherein several sets of complicated equations are calculated. Unfortunately, the accuracy may be corrupted due to the accumulation of inevitable errors between the transformation processes. This paper presents a genetic-based method for generating regressive models for direct transformation from global positioning system (GPS) signals to 2-D coordinates. Since target coordinates for a GPS application can be obtained by using simpler transformation formulas, the computational costs and inaccuracy can be reduced. The proposed method, though does not exclude systematic errors due to the imperfection on defining the reference ellipsoid and the reliability of GPS receivers, effectively reduces the statistical errors when the accurate Cartesian coordinates are known from the independent sources. From the experimental results where the target datums TWD67 is investigated, it seems that the proposed method can serve as a direct and feasible solution to the transformation of GPS coordinates.