DGPS Architecture Based on Separating Error Components, Virtual Reference Stations, and FM Subcarrier Broadcast

Lynn Weber and Anil Tiwari

Abstract:	Abstract: A practical system for providing DGPS cor- rection data over a large geographical area must be highly reliable and economical. The existing infras- tructure of broadcast FM radio stations is too good an opportunity to overlook. The transmitters are ex- tremely reliable, geographically pervasive and they are already paid for. The correction data that is broadcast to the user community is really local area applicable and relatively insensitive to weather conditions. However, when the distribution data link for the user data is terrestrial and individual transmitter cov- erage is only 25,000 to 50,000 square kilometers, in- dividual reference receivers at each site become cost prohibitive. The solution is to build a network of ref- erence stations and compute a composite data stream that can be provided to the transmitter sites to pro- duce virtual reference receiver data locally. We will describe the architecture of a system that: makes GPS measurements over a sparse reference net- work; delivers the data to a central processing hub; separates the measured range errors into their con- stituent components; creates a composite data stream; and then forwards the composite data on to the trans- mitter sites for reconstruction into virtual reference receiver data. A description of the logical process for handling the data will be followed by an explanation of the communications and processing facilities required to provide data with high reliability and confidence.
Published in:	Proceedings of the 51st Annual Meeting of The Institute of Navigation (1995) June 5 - 7, 1995 Antlers Doubletree Hotel Colorado Springs, CO
Pages:	191 - 200
Cite this article:	Weber, Lynn, Tiwari, Anil, "DGPS Architecture Based on Separating Error Components, Virtual Reference Stations, and FM Subcarrier Broadcast," Proceedings of the 51st Annual Meeting of The Institute of Navigation (1995), Colorado Springs, CO, June 1995, pp. 191-200.
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