April 1969 | NTIA Technical Memo ERL TM ITS 163

Effects of sea reflections on phase of arrival of line-of-sight Signals

Moody C. Thompson Jr.; Harris B. Janes

Abstract: Continuous wave signals at 9. 6 GHz were propagated over a 97 -KM overwater path extending from 80 m to 3000 IT) above mean sea level. Variations in phase of arrival of the signals received by antennas having 1. 2 and 5* beam widths were recorded simultaneously. The broad-beam antenna received a contribution reflected from the sea surface, while the narrow-beam antenna largely discriminated against such reflections. The broad-beam signal displayed consistently higher spectral density than did the narrow-beam signal over the fluctuation frequency range of from O. 1 Hz to the limit of the analysis at about 10Hz.

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