J. Randy Hoffman, John J. Lemmon, and 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)

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