The Use of HF Surface Wave Propagation to Support a Data Link from an Expendable Buoy
Final rept. 1 Oct 1984-30 Sep 1985
NAVAL RESEARCH LAB WASHINGTON DC
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The use of HF surface wave propagation is analyzed at frequencies of 3, 5, 7 and 10 MHz for its ability to support a moderate rate data link between an ocean deployed, expendable buoy and a quiet surface platform at ranges of 185 to 370 km 100 to 200 nmi. It is assumed that the maximum size antenna that can be supported by the buoy is a monopole of 5 meters length and 0,2 meter thickness. A mathematical model, which includes a tradeoff between bandwidth and efficiency, is used to estimate the power loss in the matching network to the buoy antenna. Estimates of the additional loss caused by the antenna bobbing in the water are given. The estimates of propagation loss as a function of frequency and sea state were taken from Barricks publications, and atmospheric noise was estimated from CCIR report 322. Predictions of the RF driver power required for the expendable buoy system are given as a function of time of day for the locations of Cuba low latitude, high noise example and the Bering Strait high latitude, low noise example. The predicted power requirements should be considered to represent a lower bound to the actual requirement in a real ocean environment.
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