A Practical Real-Time Precise CDGPS Positioning Using Mobile Phones, Internet and Low Cost C/A-Code GPS Receivers

S. J. Ko, J. H. Won and J. S. Lee

Abstract:	The problem of resolving integer ambiguity associated with the GPS carrier phase measurements makes it difficult to apply the carrier tracking technique for high precision positioning in real time. The problem becomes more difficult when only single-frequency measurements are available as in a low-cost C/A-code GPS receiver. Also, an efficient and reliable communication link is essential for transferring correction data in real-time relative positioning. This paper presents a practical real-time solution for precise Carrier Differential GPS (CDGPS) positioning using low-cost C/A-code GPS receivers and a link based on Internet and mobile phones. Such a communication link is ideal for a high data rate. Since the mobile phone and Internet system are universally available nowadays, use of such a system extends the relative positioning application to virtually unlimited areas. The Kalman filtering technique with a state reconfiguration scheme is used to estimate integer ambiguity states in varying GPS visibility environment. Field test results are presented to evaluate the performance of the proposed system.
Published in:	Proceedings of the 2001 National Technical Meeting of The Institute of Navigation January 22 - 24, 2001 Westin Long Beach Hotel Long Beach, CA
Pages:	288 - 295
Cite this article:	Ko, S. J., Won, J. H., Lee, J. S., "A Practical Real-Time Precise CDGPS Positioning Using Mobile Phones, Internet and Low Cost C/A-Code GPS Receivers," Proceedings of the 2001 National Technical Meeting of The Institute of Navigation, Long Beach, CA, January 2001, pp. 288-295.
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