The Effect of Hydrophone Configuration on the Directivity Index of a Line Array
NAVAL UNDERWATER SYSTEMS CENTER NEW LONDON CT
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The directivity index, or DI, is a special case of array gain for the condition when the signal is a plane wave and the noise field is isotropic. It is a frequently used parameter for the assessment of an arrays utility. As a part of the Broadband Passive Sonar Signal Processing program, the directivity indices for three arrays have been investigated as functions of both frequency and steering angle. All three arrays each have 32 hydrophones and a line aperture on the order of 300 meters, but each array has different hydrophone spacings. The three hydrophone spacings are 1 asymmetric geometric taper 2 symmetric geometric taper, and 3 equi-spaced. This memorandum describes the principal results of the DI study.
- Acoustic Detection and Detectors