Accession Number:

ADA003607

Title:

Bearing Estimation Using a Large Towed Array.

Descriptive Note:

Technical rept.,

Corporate Author:

CARNEGIE-MELLON UNIV PITTSBURGH PA DEPT OF STATISTICS

Personal Author(s):

• Hinich,Melvin J.
• Rule,William

Report Date:

1974-11-01

Pagination or Media Count:

25.0

Abstract:

When a towed array of hydrophones is significantly nonlinear due to bending, ordinary linear array beamforming gives a biased estimate of the true source bearing. By processing the array as a sequence of smaller aperture subarrays and then computing the median of the subarray bearings, the variation due to bending is reduced and a reasonably precise estimate is obtained if the average bending angle with respect to the nominal axis is zero. The median and mean subarray bearing is analyzed for a theoretical statistical model and is tested using artificial data for a sinusoidal and random bending model.

Descriptors:

• *TOWED ARRAYS
• *HYDROPHONES
• SIGNAL PROCESSING
• BEARING(DIRECTION)
• BEAM FORMING
• STATISTICAL ANALYSIS

Subject Categories:

• Acoustic Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE