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IEEE Journal of Oceanic Engineering

Issue 1 • Date January 1987

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Displaying Results 1 - 25 of 34
  • [Front cover and table of contents]

    Publication Year: 1987, Page(s): 0
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    Freely Available from IEEE
  • Guest Editorial

    Publication Year: 1987, Page(s):2 - 3
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    Freely Available from IEEE
  • A passive localization algorithm and its accuracy analysis

    Publication Year: 1987, Page(s):234 - 245
    Cited by:  Papers (129)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (898 KB)

    The problem of estimating source location from noisy measurements of range differences (RD's) is considered. A localization technique based on solving a set of linear equations is presented and its accuracy properties are analyzed. An optimal weighting matrix for the least squares estimator is derived. The analytical expressions for the variance and bias of the estimator are validated by Monte-Car... View full abstract»

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  • Handbook of Mechanical Damping and Acoustical Dynamic Properties of Rubbers and Elastomers

    Publication Year: 1987, Page(s): 304
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (81 KB)

    First Page of the Article
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  • Two-Dimensional Spectral Estimation: A Radon Transform Approach

    Publication Year: 1987, Page(s):90 - 96
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (584 KB)

    A new technique for two-dimensional (2-D) spectral estimation of a stationary random field (SRF) is investigated in this paper. This is based on the extension of the Radon transform theory to stationary random fields (SRF's), proposed by Jain and Ansari [19]. Using the Radon transform, the 2-D estimation problem is reduced to a set of one-dimensional (1-D) independent problems, which could then be... View full abstract»

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  • A spectrum Separation Method for the Sum of Two Non-Gaussian Stationary Time Series Using Higher Order Periodograms

    Publication Year: 1987, Page(s):80 - 89
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (640 KB)

    When we observe only the sum of two independent stationary time series generated from non-Gaussian white noises, we consider how to separate its spectrum nonparametrically into two respective spectra. For this we propose a simple method which utilizes the nonnegativity of power spectra and uses a part of the fourth-order spectrum estimated from the periodograms. Theoretically, the spectrum is uniq... View full abstract»

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  • Simulations of Matched-Field Processing in a Deep-Water Pacific Environment

    Publication Year: 1987, Page(s):173 - 181
    Cited by:  Papers (26)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (952 KB)

    Conventional bearing estimation procedures employ planewave steering vectors as replicas of the true field and seek to resolve in angle by maximizing a power function representing the agreement between actual and replica fields. For vertical arrays in oceanic waveguides the received field depends on range and depth, and it is natural to replace the "look-direction" ( View full abstract»

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  • Mixture models for underwater burst noise and their relationship to a simple bivariate density representation

    Publication Year: 1987, Page(s):29 - 37
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (672 KB)

    Many non-Gaussian processes have been modeled as having simple mixtures for their univariate densities. In this paper a switched-source model is presented and is shown to be such a process. The bivariate density of samples arising from this model is derived; this density is a particularly simple bivariate density, the Frechet density. It is further shown that any symmetric Frechet density can be t... View full abstract»

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  • The spherical interpolation method of source localization

    Publication Year: 1987, Page(s):246 - 252
    Cited by:  Papers (93)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (616 KB)

    A closed-form least squares approximate maximum likelihood method for localization of broad-band emitters from time-difference-of-arrival (TDOA) measurements, called the spherical interpolation (SI) method, is presented. The localization formula is derived from least squares "equation-error" minimization. Computer simulation results show that the SI method has variance approaching the Cramer-Rap l... View full abstract»

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  • Uncertainty tolerance in underwater acoustic signal processing

    Publication Year: 1987, Page(s):48 - 65
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1944 KB)

    Because of the difficulties in accurately characterizing the statistical behavior of underwater acoustic channels, tolerance to uncertain statistical modeling is an important property for underwater acoustic signal processing procedures to possess. This paper provides an overview of a number of techniques developed in recent years that can be applied to provide uncertainty tolerance in underwater ... View full abstract»

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  • Two-Dimensional Normalization Techniques

    Publication Year: 1987, Page(s):130 - 142
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (968 KB)

    Normalization techniques are commonly used in radar and sonar systems for maintaining uniform detection performance in a nonstationary noise background. These techniques are usually employed in one dimension, typically for range-only processing. In this paper, techniques are examined for the normalization of two-dimensional (2-D) fields, specifically in the context of range/Doppler processing. Ana... View full abstract»

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  • In Situ Optimal Reshading of Arrays With Failed Elements

    Publication Year: 1987, Page(s):155 - 162
    Cited by:  Papers (8)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (720 KB)

    An algorithm is presented which computes optimal weights for arbitrary linear arrays. The application of this algorithm to in situ optimal reshading of arrays with failed elements is discussed. It is shown that optimal reshading can often regain the original sidelobe level by slightly increasing the mainlobe beamwidth. Three examples are presented to illustrate the algorithm's effectiveness. Hardw... View full abstract»

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  • Channel Modeling and Threshold Signal Processing in Underwater Acoustics: An Analytical Overview

    Publication Year: 1987, Page(s):4 - 28
    Cited by:  Papers (61)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2400 KB)

    An overview of underwater acoustic channel modeling and threshold signal processing is presented, which emphasizes the inhomogeneous, random, and non-Ganssian nature of the generalized channel, combined with appropriate weak-signal detection and estimation. Principal attention is given to the formal structuring of the scattered and ambient acoustic noise fields, as well as that of the desired sign... View full abstract»

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  • Analysis of Signal Cancellation Due To Multipath in Optimum Beamformers for Moving Arrays

    Publication Year: 1987, Page(s):163 - 172
    Cited by:  Papers (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (912 KB)

    In this paper, we study the effect of array motion on signal cancellation and interference rejection in optimum beamformers in the presence of multipath with partially or fully correlated sources. First, we show how array motion causes signal decorrelation with a rate that depends on the spacing and directions of the sources. Next, we briefly discuss the signal cancellation and interference reject... View full abstract»

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  • Autoregressive Process Order Selection via Model-Critical Methods

    Publication Year: 1987, Page(s):75 - 79
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (496 KB)

    The selection of the order of an autoregressive process is examined via model-critical methods that allow for constructive criticism of the data and the (tentative) model, considered jointly as a single entity. These methods yield robust estimates of the model parameters and the innovations variance, which is used in the order-selection procedure which reduces as a special case to the modified Aka... View full abstract»

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  • Remote Monitoring of the Calibration of a System of Tracking Arrays

    Publication Year: 1987, Page(s):198 - 206
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (776 KB)

    Post-test analysis of vehicle tracking data taken from a three-dimensional underwater range requires the splicing together of several pieces of track individually produced by distinct transducer arrays. The location and orientation of the arrays must be known precisely in order to convert locally determined track into a coherent record in the general range coordinate system. The maintenance of cal... View full abstract»

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  • A class of sequential adaptive detectors for underwater non-gaussian noise environments

    Publication Year: 1987, Page(s):38 - 47
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (904 KB)

    The problem of sequential signal detection in non-Gaussian noise is considered. The proposed detectors arc robust and increase the transmission rate up to four times the rate of their fixed-sample-size counterparts. The performance of the detectors is evaluated for low signal-to-noise-ratio (SNR) environments encountered in underwater acoustics. To improve the efficiency and to suppress the influe... View full abstract»

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  • Dissipation observations of drag coefficients over the open ocean

    Publication Year: 1987, Page(s):296 - 300
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (432 KB)

    Forty-three open-ocean observations of drag coefficients observed at Argus Island Tower near Bermuda by the dissipation technique resulted in constant drag coefficients for mean horizontal wind velocities between 7.8 and 10.4 m .s^{1} in good agreement with the larger near-neutral data set of DeLeonibus and Simpson [1] and the neutral data of Large and Pond [... View full abstract»

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  • Signature Modeling for Acoustic Trainer Synthesis

    Publication Year: 1987, Page(s):143 - 147
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (528 KB)

    As shipboard acoustic sensor systems have increased in complexity, embedded trainers have gained acceptance as a means of providing continuous unalerted operator training. An essential element of these trainers is a contact signature synthesizer which generates simulated sensor outputs equivalent to those produced by a received maneuvering contact. In this paper, we give an overall contact signatu... View full abstract»

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  • Track Parameter Estimation from Multipath Delay Information

    Publication Year: 1987, Page(s):207 - 221
    Cited by:  Papers (7)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1064 KB)

    It is desired to track the location of an underwater acoustic source with range difference measurements from a stationary passive array. Many times, the array has only one or two sensors, and the multipath and intersensor range difference measurements are insufficient to localize and track a source moving along an arbitrary path [1]. Here, we propose to track sources with one- or two-sensur statio... View full abstract»

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  • A Practical Approach to the Estimation of Amplitude and Time-Delay Parameters of a Composite Signal

    Publication Year: 1987, Page(s):273 - 278
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (568 KB)

    A method for estimating the amplitude and time-delay parameters for signals that can be represented as a sum of a number of scaled and delayed replicas of a known signal in the presence of nonwhite Gaussian noise is presented. The method is based upon the principles of maximum likelihood (ML) estimation, but at certain key points simplifying assumptions are made that result in a computationally pr... View full abstract»

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  • Maximum likelihood estimation of the parameters of a tone using real discrete data

    Publication Year: 1987, Page(s):279 - 280
    Cited by:  Papers (38)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (208 KB)

    The exact form of the maximum likelihood (ML) estimates for the amplitude, phase, and frequency of a tone is obtained for the real discrete data case, and is applicable tO arbitrary data record lengths. View full abstract»

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  • Matched-Filter Envelope Detector Deflection Performance for a Correlated Phase Channel

    Publication Year: 1987, Page(s):228 - 233
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (520 KB)

    In this paper, the effect of channel phase coherence upon a matched filter envelope detector output is investigated for a pulsed radar or active sonar. A novel model for the correlated channel phases allows the explicit calculation of the loss in detection performance using the deflection criteria. The theoretical model yields good agreement with simulations when the phase correlation coefficients... View full abstract»

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  • Shortening of submerged ocean cables due to hydrostatic pressure

    Publication Year: 1987, Page(s):281 - 288
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (672 KB)

    It is well known that a submerged cable, under hydrostatic pressure, will shrink in diameter due to radial compressive stresses. Less widely appreciated is that the cable will also shorten due to axial compressive stresses acting along the length of the cable. This paper offers an explanation and presents numerical examples to illustrate this shortening effect. It is demonstrated that a submerged ... View full abstract»

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  • Optimum and Suboptimum Detector Performance for Signals in Cyclostationary Noise

    Publication Year: 1987, Page(s):97 - 115
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1192 KB)

    The detection of known and partially known signals in additive white Gaussian uonstationary noise is considered, with primary attention to the ease where the time-varying noise intensity parameter N_{o}(t) is a periodic function. Optimum receiver structures are derived for three detection cases, namely completely known signals, sinusoids with random phase, and sinusoids with both random amplitude ... View full abstract»

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Aims & Scope

The IEEE Journal of Oceanic Engineering (ISSN 0364-9059) is the online-only quarterly publication of the IEEE Oceanic Engineering Society (IEEE OES). The scope of the Journal is the field of interest of the IEEE OES, which encompasses all aspects of science, engineering, and technology that address research, development, and operations pertaining to all bodies of water. This includes the creation of new capabilities and technologies from concept design through prototypes, testing, and operational systems to sense, explore, understand, develop, use, and responsibly manage natural resources.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
N. Ross Chapman
School of Earth & Ocean Sciences
University of Victoria
3800 Finnerty Road
Victoria, BC V8P 5C2 Canada
chapman@uvic.ca