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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 (176)  |  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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  • 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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  • Oceanic low-angle monopulse radar tracking errors

    Publication Year: 1987, Page(s):289 - 295
    Cited by:  Papers (7)  |  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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  • 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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  • 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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  • The spherical interpolation method of source localization

    Publication Year: 1987, Page(s):246 - 252
    Cited by:  Papers (95)
    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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  • 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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  • 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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  • 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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  • Maximum likelihood estimation of the parameters of a tone using real discrete data

    Publication Year: 1987, Page(s):279 - 280
    Cited by:  Papers (41)
    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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  • 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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  • 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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  • On Performance of Array Signal Processing

    Publication Year: 1987, Page(s):148 - 154
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (592 KB)

    A unified treatment for performance evaluation of various array signal processors is presented. Detection performance is expressed in terms of the parameter of the power-type receiver operating characteristic (ROC) for optimum, beamformer, and null-steerer detectors. Estimation performance is analyzed in terms of the normalized mean-square error (MSE) for minimum mean-square error (MMSE) and maxim... 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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  • 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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  • 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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  • 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 (6)
    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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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