Accession Number : ADA260615


Title :   Localization of Acoustic Transients in Shallow Water Environments


Descriptive Note : Master's thesis


Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF ELECTRICAL AND COMPUTER ENGINEERING


Personal Author(s) : Nicholson, Charles L


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a260615.pdf


Report Date : Dec 1992


Pagination or Media Count : 38


Abstract : Determination an of an underwater target's position using passive acoustic sensors is of considerable use for the Navy, both for anti-submarine warfare (ASW) and underwater surveillance. This thesis proposes and develops localization algorithms capable of passively determining the location of a transient source given some broad constraints. In particular, this thesis investigates the effect of the source signal uncertainty on localizer performance. The localization process consists of two parts. First, a time domain propagation modeling code determines the impulse response of the environment from all possible source locations to a single hydrophone. This program predicts the signal as it would appear at the receiver from a grid of possible source locations. Second, source localization results from finding the maximum correlation between the positionally dependent, numerically modeled signals and the actual received signal. The position of the maximum cross correlation reveals an estimate of source position. Using model to model correlation, this technique successfully localized acoustic sources in both Monterey Bay and Barents Sea scenarios.


Descriptors :   *ACOUSTIC SIGNALS , *UNDERWATER ACOUSTICS , *ACOUSTIC DETECTORS , *UNDERWATER TARGETS , ALGORITHMS , COMPUTERIZED SIMULATION , SCENARIOS , TRANSIENTS , TRANSFER FUNCTIONS , MODELS , NAVY , HYDROPHONES , BAYS , CROSS CORRELATION , ANTISUBMARINE WARFARE , TIME DOMAIN , SURVEILLANCE , ACOUSTIC VELOCITY , SUBMARINE DETECTION , BARENTS SEA , OCEANS , ACOUSTICS , GRIDS , THESES , SHALLOW WATER , RESPONSE , RECEIVERS , PARABOLAS


Subject Categories : Acoustic Detection and Detectors


Distribution Statement : APPROVED FOR PUBLIC RELEASE