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

Abstract: Signal strength measurements in the 285- to 325-kHz band were conducted on eight U.S. Coast Guard differential global positioning system beacons along the Gulf and West Coast, and on a Federal Aviation Administration beacon in Bennett, Colorado. Data were acquired continually en route between sites and tagged with geographical position. Field strength of each individual signal was plotted against distance from the transmitter. Cumulative distributions and histograms of deviation from the least squares fit were also plotted. Results of the measurements were used as model inputs and to compare results to model predictions.

Keywords: Global Positioning System (GPS); differential GPS (DGPS); signal strength measurements; U.S. Coast Guard beacon; FAA beacon; propagation models

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