Effect of cardioid and limaçon directional sensors on towed array reverberation response
Keywords:Acoustic wave reflection, Antenna arrays, Dipole antennas, Echo suppression, Signal detection, Limacon directional sensors, Omni-directional elements, Towed array reverberation
AbstractThe effect of cardioid and limacon directional sensors on towed horizontal line array reverberation response,was investigated. As the use of towed horizontal line arrays give axial symmetry of beam patterns that led to left-right ambiguity, application of elements with directional responses where the omni-directional elements are augmented with crossed dipole pairs allowing formation of cardioid or limacon beam patterns to improve the echo-to-reverberation ration was examined. It was observed that production of towed array beam patterns with cardioid or limacon directional sensors in place of omni-directional elements reduces the reverberation by 6 dB and suppress the ambiguous beam near broadside. The limacon sensors reduce the ambiguous beam, and echo-to-reverberation ratio, much more effectively than the cardioid sensors and it is very useful for target detection.
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