IEEE Journal of Oceanic Engineering

Issue 1 • 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
  • 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 (482 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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  • Simulations of Matched-Field Processing in a Deep-Water Pacific Environment

    Publication Year: 1987, Page(s):173 - 181
    Cited by:  Papers (32)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (940 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" (theta) by a "look-po... 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 (507 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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  • A passive localization algorithm and its accuracy analysis

    Publication Year: 1987, Page(s):234 - 245
    Cited by:  Papers (189)  |  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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  • High-Resolution Signal and Noise Field Estimation Using theL1 (Least Absolute Values) Norm

    Publication Year: 1987, Page(s):253 - 264
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1099 KB)

    In this paper a new method for obtaining a quantitative estimate of an acoustic field consisting of a set of discrete sources and background noise is described. The method is based on theL1 (least absolute values) norm solution to an underdetermined system of linear equations defining the Fourier transform of the signal series. Implementations of the method with either equality or inequ... 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 (420 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 and10.4 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 [2], both of whom observed... 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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  • The Application of Conditional Beta Density Functions to Model Time- Delay Measurement Errors

    Publication Year: 1987, Page(s):265 - 272
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (576 KB)

    A conditional beta probability density function is employed to model time-delay measurement errors associated with sensors used in triangulation ranging applications. This type of density function is less restrictive than the beta density used in previous analyses in that end points can be extended out beyond the imposed range constraints and data editing is allowed before range calculations. The ... 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 (11)
    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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  • 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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  • Adaptive State Estimation for a System With Unknown Input and Measurement Bias

    Publication Year: 1987, Page(s):222 - 227
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (464 KB)

    An adaptive state estimator for passive underwater tracking of maneuvering targets is developed. The state estimator is designed specifically for a system containing independent unknown or randomly switching input and measurement biases. In modeling the stochastic system, it is assumed that the bias sequence dynamics for both input and measurement can be modeled by a semi-Markov process. By incorp... View full abstract»

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  • The spherical interpolation method of source localization

    Publication Year: 1987, Page(s):246 - 252
    Cited by:  Papers (101)
    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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  • The geometrical factor of a marine resistivity probe with four ring electrodes

    Publication Year: 1987, Page(s):301 - 303
    Cited by:  Papers (9)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (224 KB)

    Electrical resistivity (or conductivity) is often a useful parameter for investigating the marine sedimentary environment. The resistivity of unconsolidated sediment is usually measured in the laboratory from sample cores. Since the resistivity of sediment is highly dependent upon the pore arrangement and water contents, the laboratory values may not represent those under undisturbed conditions. B... 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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  • 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 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 (12)
    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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  • 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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  • Autoregressive Modeling of Nonstationary Multibeam Sonar Reverberation

    Publication Year: 1987, Page(s):116 - 129
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1240 KB)

    This work describes a technique for simulating nonstationary multibeam Gaussian sonar reverberation sequences. The primary objective is to simulate quadrature-demodulated complex digital vector sequences that have a prescribed time-variant covariance function. We use a first-order integral scattering model to relate geometrical, environmental, and sonar parameters to the assumed locally stationary... View full abstract»

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  • Track Parameter Estimation from Multipath Delay Information

    Publication Year: 1987, Page(s):207 - 221
    Cited by:  Papers (8)  |  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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  • 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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  • 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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  • Oceanic low-angle monopulse radar tracking errors

    Publication Year: 1987, Page(s):289 - 295
    Cited by:  Papers (8)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (624 KB)

    Radar systems often experience difficulties when tracking low-altitude targets over the ocean because of multipath effects. Whenever the radar cannot resolve the target from its image, it will track a false target position which can move far above or below the actual position. In this paper, mathematical models are utilized to quantitatively determine the degradation in tracking ability of a monop... View full abstract»

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  • Wide-Band Monopulse Sonar: Processor Performance in the Remote Profiling Application

    Publication Year: 1987, Page(s):182 - 197
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1744 KB)

    Monopulse radars are used extensively to track isolated targets to within angular error variances that are very small in comparison with antenna beamwidth. Analogous active sonar configurations (e.g., split-beam sonar) have been in use for several decades, although very little attention has been paid to adaptation of the monopulse concept to accommodate wide-hand operation, or to the angular error... 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
Mandar Chitre
Acoustic Research Laboratory
National University of Singapore
18 Kent Ridge Road
Singapore, 119227