Support of The System Test and Analysis Program for The Nationwide Differential Global Positioning System Modernization Program

Federal Highway Administration2002PDFTech ReportLarsen, Gary E.United States. Department of Transportation. Federal Highway Administration. Turner-Fairbank Highway Research CenterU.S. Department of Transportation. Federal Highway Administration, Research, Development, and Technology. Turner-Fairbank Highway Research CenterUnited StatesGlobal Positioning SystemAccuracyAnalysisCost effectivenessModernizationTestingHighwaysMarine TransportationOperations and Traffic ManagementPlanning and ForecastingTraffic and Transport PlanningFHWA-RD-02-110The Nationwide Differential Global Positioning System (NDGPS) Modernization Program is a multiagency effort to examine the viability of long baseline carrier phase differential correction techniques. Phase I of this program analyzes broadcasting Global Positioning System observables from a single NDGPS site, Hagerstown, MD, to aid in determining the appropriate signal structure and compression techniques to support long range carrier phase operations. Phase II will install a second facility near Hawk Run, PA, enabling multiple baseline carrier and code phase navigation solutions. This first report verifies that the accuracy that can be achieved over a long baseline from a single facility is within the estimated 10-centimeter (95 percent) horizontal navigation accuracy hypothesized.119