A System for Precise Real-Time Differential GPS Positioning in the Decimeter Range

Herbert Landau, Hans- Jurgen Euler

Abstract:	Recent survey results of the navigation market indicate a growing need for precise real-time posi- tioning on land, on sea, in air and space (e.g. na- vigation of dredging vessels, automated aircraft landing, positioning of airborne sensors). Post- mission analyses of observations using the Global Positioning System have already shown the po- tential of the GPS system to deliver centimeter accuracies over baselines of several hundreds of kilometers. It is therefore a challenge to develop also a GPS navigation system with such a high accuracy level. The paper introduces a system based on six- channel low-cost C/A code receivers reaching ac- curacies in the decimeter range in real-time and in the centimeter range for post- mission. The receivers are controlled by separate proces-sors which are communicating via a radio link in the UHF band. The controllers are IBM compati- ble and are communicating with the receivers via serial interfaces. The hard- and software compon- ents and the underlying algorithms are described. The system allows update rates of 1 Hz and the delay for the position fix is less than two seconds. In order to prove the accuracy and the per- formance of the system several experiments were performed using the system in different environ- ments. Results of these tests are presented.
Published in:	Proceedings of the 47th Annual Meeting of The Institute of Navigation (1991) June 10 - 12, 1991 Williamsburg Hilton and National Conference Center Williamsburg, VA
Pages:	443 - 447
Cite this article:	Landau, Herbert, Euler, Hans- Jurgen, "A System for Precise Real-Time Differential GPS Positioning in the Decimeter Range," Proceedings of the 47th Annual Meeting of The Institute of Navigation (1991), Williamsburg, VA, June 1991, pp. 443-447.
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