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Sonar (originally an acronym for SOund Navigation And Ranging) is a technique that uses sound propagation (usually underwater, as in submarine navigation) to navigate ...
Table of Contents. Introduction Fundamental Theory Frequency, Velocity and Wavelength Modes of Propagation Variables that …

ECO Frequency Information System. EFIS is the tool to fulfill EC Decision 2007/344/EC on the harmonised availability of information regarding spectrum use in Europe ...



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