Wide Area DGPS Design Issues Study.
Abstract
The U.S. Coast Guard will deploy a network of 50 DGPS reference stations by 1996 using the existing marine beacon network to transmit differential GPS corrections to marine users as part of a marine user DGPS service. The stations will provide coverage on the East, Gulf, and West Coasts, as well as the Great Lakes, Alaska, Hawaii, and Puerto Rico. Under this study, the authors postulated and evaluated three candidate Wide Area DGPS (WADGPS) network architectures. These architectures would extend the DGPS service architecture to a proposed WADGPS service architecture. This report presents results in broad areas of WADGPS network technology: network architectures and network software. One of the new concepts introduced is that of a fault-tolerant network. This concept incorporates flexible architecture which can reconfigure itself in the event of a failure of any of its components-such as the loss of some of the reference stations in the network. The Model Assessment section examines the error mechanisms which contribute to Differential GPS errors, both for the DGPS (single reference station) service and each of the three WADGPS (multiple reference station) networks. This leads into a presentation of various candidate network algorithms for these three WADGPS networks. In particular, a new algorithm, developed under this contract, is presented which offers improved performance for two of the three WADGPS network architectures over existing algorithms in the literature.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1995
- Accession Number
- ADA290240
Entities
People
- Len Sheynblat
- Peter Loomis
- Tysen Mueller