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New location selected for HA-NDGPS signal.

FHWA's Office of Operations Research and Development (R&D) selected Hawk Run, PA, as the new location for broadcasting the signal for the High Accuracy-Nationwide Differential Global Positioning System (HA-NDGPS), which provides the capability to transmit corrections to global positioning

systems. Application of HA-NDGPS will provide advanced safety features for transportation, including lane-departure and collision warnings for motorists and track-defect alerts for railroad engineers.

At each NDGPS facility, including Hawk Run, FHWA installs a reference station to monitor the GPS constellation (configuration of satellites) and to develop corrections. For HA-NDGPS, centimeter-level corrections are broadcast for users to receive and process. The system works like an AM or FM radio station, sending information to users who make the final navigation solutions.

The signal in Hawk Run will be monitored to ensure that it provides the accuracy to meet the needs of transportation-related and other applications.

For more information on the HA-NDGPS signal and its new location, contact Jim Arnold at 202-493-3265 or james.a.arnold@fhwa.dot.gov.

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