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INSTRUMENTATION TECHNIQUES FOR ANALYSIS OF CHARACTERISTICS OF ANIMAL SONAR PULSES.
LOCKHEED AIRCRAFT CORP BURBANK CALIF
The following conclusions are offered 1 The demonstrated effects of inhomogeneities of the transmission medium on airborne pulses, analogous to the inhomogeneities of sea water, probably relegates the active sonar signature of a water immersed target to a statistical description, i.e., single-pulse returns will evidence variations that must be detected by multiple samples. 2 The survival history and recently demonstrated target performance of several marine mammals strongly indicates their use of rapidly repeated pulses to utilize a pulse phoneme principle. 3 The observable and measurable differences in some physical parameters of marine mammal sonar pulses suggests functional specificity related in some fashion to the biological needs and capabilities of a particular genus. 4 Zalophus appears to produce pulses of much narrower bandwidth than do cetacea. 5 The use of certain analysis methods outlined above may reveal classification techniques for relating functional behavior of cetacea on the basis of their echolocation mechanisms. Author