Average Transmission Loss for Model SOFAR Channels.
NAVAL UNDERWATER SYSTEMS CENTER NEW LONDON CONN NEW LONDON LAB
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Transmission loss in the deep sound channel is usually regarded as arising from spherical spreading out to a transition range R sub o, with cylindrical spreading beyond, plus an attenuation loss proportional to range. The purpose of this memorandum is to examine SOFAR transmission loss using ray theory, the study having been prompted by a great variation in the experimentally determined values of R sub o. Under the assumption that ray theory is applicable, and that the attenuation is the same along all rays, an expression can be obtained for the average acoustic intensity in the SOFAR channel at long ranges. It is noted that Urick has presented similar, but incomplete, results for the same problem. Author