A Common Framework for Acoustic Signal Analysis in the Ocean Environment

Hassab, Joseph C.

doi:10.1007/978-3-642-82002-1_1

Cited by 6 publications

(3 citation statements)

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“…Two types of estimator applications exist depending on whether observation of the contact is by active [1,2] or passive [3] sonar. In the active case the contact is ensonified by a signal emitted from the observer and observations are made on the backscattered returns from the contact.…”

Section: Section II General Classes Of Contact State Estimation Probmentioning

confidence: 99%

“…The ensuing divergence is bypassed and the processes are routed in a degraded mode until the system recovers. When the traditionally separated signal and data processing stages are interactive (see appendix A), further improvement can take place because system deterioration is usually local and not total [3]. Statistical smoothing as a means of minimizing errors is discussed further in sections V and VI.…”

Section: Statistical Smoothingmentioning

confidence: 99%

“…This estimator provides measurements of time intervals-(e.g., frequency and time delay) by processing the observed contact signature. It includes functions such as spectral analysis, signal comparison (auto-A-2 and cross-correlation), homomorphic filtering, least squares processing, and complex demodulation [3,30,31)A -8]. The estimator operates on the appropriate outputs from the beamformer, mapping embedded data in the received signal (such as time interval) into recognizable (minimum, maximum, or slope) and measurable clues (time delays).…”

Section: Basic Time Delay Estimatormentioning

confidence: 99%

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Contact Localization and Motion Analysis in the Ocean Environment: A Perspective

Hassab¹

1983

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UNCLASSIFIED 15«. DECLASSIFICATION / DOWNGRADING SCHEDULE ie. DISTRIBUTION STATEMENT lof IhU ReponI 17. DISTRIBUTION STATEMENT lof the abttract enumd in Block 20, if differttU from Reponi Approved for public release; distribution unlimited. 19. SUPPLEMENTARY NOTES 19. KEY WORDS fContmua on rewne iide if neemsMry and idmntify by block number/ Contact Location and Motion Analysis 20. ABSTRACT {Continue on mvene aide if neceaaary and identify by block numbert This document provides an overview of Contact Localization and Motion Analysis (CLMA) in the ocean environment. Such well-studied cases as passive bearings-only contact motion analysis, multipath ranging, and localization/tracking via arrays are used to illustrate the concept. The performance of current CLMA systems is shown to depend on the type and characteristics of the basic measurements developed by their time delay estimators, the acoustic channels linking contact and observer, and the DD, 'r"147 3 20. Abstract (Cont'd) type and description of relative motion between contact and observer. General classes of CLMA schemes are presented. Complexity is shown to depend on the linearity/nonlinearity of their solution equations, the degree to which a contact is observable at each sample time, and the relative motion or degree of stationarity between contact and observer. Contributions to total system gain, biasing issues, and candidate solutions are discussed. Comprehensive references are provided.

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Section: Section II General Classes Of Contact State Estimation Probmentioning

confidence: 99%

Section: Statistical Smoothingmentioning

confidence: 99%

Section: Basic Time Delay Estimatormentioning

confidence: 99%

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