Nationwide Differential Global Positioning System (NDGPS)
Fact Sheets
NDGPS Fact Sheet
High Accuracy NDGPS Fact Sheet
Articles
Next Step in Differential
GPS Evolution: 10 Centimeter Accuracy 
by Rudy Persaud and James Arnold - Transporter, June 2002
New Life for Old Transmitters:
Converting GWEN to NDGPS
by James A. Arnold - Public Roads, September/October 2001
FHWA Working to Improve Weather
Forecasting Using NDGPS
by Rudy Persaud- Transporter, October 2001
New Applications Make
NDGPS More Pervasive
by James A. Arnold - Public Roads, January/February 2001
A More Precise Sense of Where
We Are
by James A. Arnold, Rudy Persaud, and David Smallen - Public Roads,
January/February 2000
Surface Transportation and
Global Positioning System Improvements: L5 and DGPS
by James A. Arnold - Public Roads, January/February 1998
Structural Monitoring With
GPS
by Keith Duff and Michael Hyzak - Public Roads, Spring 1997
Navigating the Future
by James A. Arnold - Public Roads, Autumn 1995
Reports
High Accuracy-Nationwide Differential Global Positioning
System Test and Analysis: Phase II Report, July 2005, FHWA-HRT-05-034
Support of the System Test and Analysis Program for the Nationwide Differential
Global Positioning System Modernization Program
Phase I High Accuracy-Nationwide Differential
Global Positioning System Report, FHWA-RD-02-110 (July 2002)
Field Strength Measurements of DGPS and
FAA Beacons in the 285 to 325 kHz Band
(November 1, 1996)
Final Programmatic Environmental Assessment
(PEA): Nationwide Differential Global Positioning System Report
(September 1999, PDF file - 246 pages)
An Investigation of The Use of Differential
Global Positioning System (GPS) Technology and its Augmentations within
State and Local Transportation Departments
(updated version)
(FHWA-RD-00-093, July 2000, PDF - 175
KB)
Performance Parameter Tradeoff Analysis
for a Nationwide Differential GPS Service
Report to Congress:
The Department of Transportation on Civilian Use of the Global Positioning
System (GPS): The Nationwide Differential Global Positioning System
and Additional Civilian GPS Signals
Site Selection Plan & Installation
Guidelines for a Nationwide Differential GPS Service August 5,
1997
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