A Prototype Long Baseline DGPS Concept Demonstration for NDGPS High Performance Land Applications

Yujie Zhang and Chris Bartone

Abstract:	This research investigates various error mitigation, solution, and implementation techniques for the development and demonstration of a prototype NDGPSHigh Performance (NDGPS-HP) architecture to support cm level positioning for Positive Train Control (PTC) applications; HP includes the accuracy, integrity, availability, and continuity for the system (Zhang 2005). The GPS orbit and clock correction techniques using WAAS and IGS were investigated in terms of accuracy and integrity. A combination of RF, receiver-based, and software data processing approaches were implemented and/or investigated to limit the multipath for the reference stations and user stations. Software data processing for multipath mitigation at the ground reference station was accomplished using the WAAS CNMP technique; the WaveSmoothTM technique was investigated and used for the dynamic user site. Along with an investigation of various troposphere correction techniques, a Real-time Meteorological based Troposphere (RMT) model was developed with an accuracy indicator analysis. Various nonlinear geometry correction techniques were investigated for long baseline application and a Projected DGPS (PDGPS) algorithm was used. The NDGPS-HP integrity consideration was initiated. A highway van test was conducted to demonstrate the feasibility of the NDGPS-HP architecture for various baselines. The user solution accuracy (2D RMS) obtained was 12.8 cm for a 295 km baseline and 16.2 cm for a 780 km baseline, using an ODOT and NDGPS reference station, respectively.
Published in:	Proceedings of the 18th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2005) September 13 - 16, 2005 Long Beach Convention Center Long Beach, CA
Pages:	362 - 375
Cite this article:	Zhang, Yujie, Bartone, Chris, "A Prototype Long Baseline DGPS Concept Demonstration for NDGPS High Performance Land Applications," Proceedings of the 18th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2005), Long Beach, CA, September 2005, pp. 362-375.
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