Frequency and Temporal Coherence Variation for Sea Surface Fluctuation

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概要

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• Sea surface fluctuation by the wind has an effect on the performance of underwater communication systems since it induces time-variant scattering. Such scattering gives the time spread and consequently the signal fading in the amplitude and phase of the transmitted signal. In this study, such signal fading is examined experimentally on the basis of frequency and temporal coherence variations under wind speeds of about 15–16 kn at a 15.5 m height from the sea level. The frequency coherence bandwidth of surface reflection scattered signals is found to be about 300 Hz at a 3 dB bandwidth. The mean coherence is about 0.9 for a grazing angle of 16° and at wind speed of 15–16 kn. The dominant coherence variation frequency is consistent with the dominant sea surface wave frequency.

• Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
• 2009-07-25

著者

• Park Joung-Soo

  Agency for Defense Development

• Yoon Jong

  Division Of Electronic Computer And Telecommunication Engineering Pukyong National University

• Park Jihyun

  Division of Electronic, Computer and Telecommunication Engineering, Pukyong National University, Busan 608-737, Korea

• Park Joung-Soo

  Agency for Defense Development, PO Box 18, Jinhae, Kyongnam 645-600, Korea

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