Institute for Telecommunication Sciences
the research laboratory of the National Telecommunications and Information Administration

J. Randy Hoffman; John Lemmon; Ronald L. Ketchum

Abstract: Field strength measurements of a 300-kHz Differential Global Positioning System signal transmitted at a Ground Wave Emergency Network site at Appleton, Washington were conducted. Data were acquired continually along five different routes and tagged with geographical position. Field strength along each individual route was plotted against distance from the transmitter and related to geological landmarks. Results were used as model inputs and to compare measured signal strengths with model predictions.

Keywords: Global Positioning System (GPS); differential GPS (DGPS); signal strength measurements; propagation models; Ground Wave Emergency Network (GWEN)

To request a reprint of this report, contact:

Lilli Segre, Publications Officer
Institute for Telecommunication Sciences
(303) 497-3572

For technical information concerning this report, contact:

Chriss A. Hammerschmidt
Institute for Telecommunication Sciences
(303) 497-5958

Disclaimer: Certain commercial equipment, components, and software may be identified in this report to specify adequately the technical aspects of the reported results. In no case does such identification imply recommendation or endorsement by the National Telecommunications and Information Administration, nor does it imply that the equipment or software identified is necessarily the best available for the particular application or uses.

Back to Search Results