INSTRUMENTATION TECHNIQUES FOR ANALYSIS OF CHARACTERISTICS OF ANIMAL SONAR PULSES.

摘要

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)