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NDGPSNational Differential Global Positioning System
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An interagency group of technical people, the NDGPS Policy and Implementation Team, recommends policy for the implementation of the NDGPS system, including establishing priorities for converting GWEN sites to NDGPS.
The practical applications of NDGPS include grand applications and simple ones.
5 million square kilometers) of land -- with NDGPS presents significant challenges: setting up 14 NDGPS sites, grappling with severe weather, getting to remote sites to set up the equipment, providing power to the sites, and coping with permafrost ground conditions in constructing the sites.
With the NDGPS and a plat of the property, it is relatively easy to relocate the markers and determine the area that is covered under the program.
Preliminary work has shown that even a limited NDGPS can improve that accuracy to approximately 1 meter (3 feet).
Improvements are possible because the fixed location of an NDGPS tower is compared with the GPS-determined location of the tower and the measured difference between actual location and GPS location can be used as a correction factor.
The NDGPS installation plan calls for the deployment of 80 low-frequency broadcast stations by the end of 2002.
The existing system has been used for many important purposes, such as helping boaters, hikers, and fliers determine their location, but NDGPS will make possible a multitude of new uses.
These fixed locations -- the 91-meter towers -- are the basis for DOT's NDGPS.
Based on the success of the Appleton station test, DOT determined that conversion of the GWEN transmitters would save the Air Force $6 million in decommissioning costs, while decreasing NDGPS deployment costs by $10 million.