Abstract
During High Frequency Experiment in 2003 (HFX-03) various ocean parameters such as the surface wave spectrum, salinity, and temperature profiles were recorded simultaneously with the broadband acoustic signals. Including broadband probe chirps as well as several other communication sequences. Received data are collected and analyzed from different receiver arrays. The statistics of arrival rays and the performances of communication system are studied in two periods of calm and rough sea conditions. Surface reflected rays show variable coherence during different sea surface conditions. This has large influence on the structure of the received signals. Strong dependence between sea surface condition and the performance of communication system is observed. Two types of receiver structures are used and their performances are compared: (1) single channel receiver with decision feedback equalizer, (2) multichannel receiver with signal combining scheme. Similar trends of dependence are found on both receivers. [Work supported by ONR-321OA.]
Published Version
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