Download or read book Adaptive Target Tracking of Underwater Maneuvering Targets Using Passive Measurements written by Richard L. Moose and published by . This book was released on 1981 with total page 85 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report examines the problem of adaptively tracking a maneuvering target in two dimensional space using passive time delay measurements. The target is free to maneuver in velocity and to make depth changes at times unknown to the observer. Tracking is accomplished by using the basic polar model of target and observer motion previously developed, and included in this report for the convenience of the reader. However, the important distinction is that now a nonlinear prefilter has been added to the tracking system. This leads to two major benefits: the first, is that the need for extended Kalman filters is completely eliminated which gives the tracking system a much a larger degree of robustness than it previously had. The second benefit is a decoupling of the depth estimator from the polar range estimator, which considerably reduces the computational level of the adaptive tracking system. (Author).
Download or read book Adaptive Target Tracking of Underwater Manoeuvering Targets Using Passive Measurements U written by Richard L. Moose and published by . This book was released on 1981 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Adaptive Target Tracking for Underwater Maneuvering Targets written by Richard L. Moose and published by . This book was released on 1979 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report examines the problem of adaptively tracking a maneuvering submarine in two dimensional space utilizing passive time delay and Doppler frequency measurements of unknown or randomly varying center frequencies. The target is free to maneuver in velocity and depth with tracking being done in the vertical plane. It is pointed out how to incorporate bearing measurements into the present polar model to achieve a three dimensional target tracking capability. (Author).
Download or read book An Adaptive Passive Underwater Tracking and Target Localization System written by R. A. Abate and published by . This book was released on 1964 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: A target localization system utilizes a passive sonar tracking device to measure target relative bearing which is required for fire control. The parameters of the system depend on the ratio of power radiated from the target to noise power from other sources. Since this signal-to-noise ratio varies with time, the tracking system is describable by a linear differential equation with time-varying coefficients. The bearing data supplied to fire control is inherently contaminated with noise due to the method of processing raw data from the hydrophone array and due to transients which occur as signal-to-noise ratio changes. It is shown that improved fire control solutions result if each bearing is weighted by the inverse of the variance. A technique for computation of the variance of the bearings is developed. Implementation of the technique requires continuous measurement of the parameters of the tracking device. A computer for performing this measurement is discussed. Results of simulation studies are presented fr an adaptive target localization system which weights the bearing data as a function of computed variance. (Author).
Download or read book Underwater Signal and Data Processing written by Joseph C. Hassab and published by CRC Press. This book was released on 2018-01-18 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt: A systematic and integrated account of signal and data processing with emphasis on the distinctive marks of the ocean environment is provided in this informative text. Underwater problems such as space-time processing relations vs. disjointed ones, processing of passive observations vs. active ones, time delay estimation vs. frequency estimation, channel effects vs. transparent ones, integrated study of signal, data, and channel processing vs. separate ones, are highlighted. The book provides the beginner with a concise presentation of the essential concepts, defines the basic computational steps, and gives the mature reader an advanced view of underwater systems and the relationships among their building blocks. It presents the needed topics on applied estimation theory within the underwater systems context. Included are topics in linear and nonlinear filtering, spectral analysis, generalized correlation, cepstrum and complex demodulation, Cramer-Rao Bounds, maximum likelihood, weighted least-squares, Kalman filtering, expert systems, wave propagation and their use, as well as their performance in applications to canonical ocean problems. The applications center on the definition, analysis, and solution implementations to representative underwater signal analysis problems dealing with signals estimation, their location and motion. The potential limitations and pitfalls of the implementations are delineated in homogeneous, noisy, interfering, inhomogeneous, multipath, distortions, and/or dispersive channels.
Download or read book An Adaptive Estimator for Passive Range and Depth Determination of a Maneuvering Target written by Richard L. Moose and published by . This book was released on 1972 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report describes an adaptive state estimator that can significantly improve the passive range and depth determination of a randomly maneuvering target. The target in this study is a submarine, which, while being tracked, performs large-magnitude depth changes at times unknown to the tracking submarine. Present passive tracking techniques usually utilize a Kalman filter to process the azimuth and/or elevation observations. A Kalman filter will theoretically give the 'best' estimates of target range, depth, and velocity when the system and measurement errors can be modeled as Gaussian processes. The main difficulty in using a Kalman filter in passive tracking applications is that large bias errors invariably develop as the target makes large alterations in velocity or depth. A technique for including a feedback-type learning processor in conjunction with the Kalman filter has been found to greatly reduce bias errors produced by the maneuvering target. (Author).
Download or read book Issues in Acoustic Signal Image Processing and Recognition written by C. H. Chen and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt: The NATO Advanced Research Workshop on Issues in Acoustic Signal/Image Processing and Recognition was held August 5-9, 1982 at the Cappuccini complex in San Miniato Italy. The Workshop was primarily concerned with the underwater acoustic signal processing and seismic signal analysis and a major effort was made to link these topics with pattern recognition, i~ge processing and artificial intelligence. Major issues and new approaches in these interrelated areas were closely examined in the Workshop. In addition to paper presentations three discussion sessions were held on! (1) spectral analysis in underwater acoustics, (2) seismic wave propaga tion, seismic imaging and migration, and seismic inversion, and (3) unresolved issues and future directions. This Proceedings volume includes most presentations made at the Workshop. The publication, like the meeting itself, is unique in the sense that it provides exten sive interactions among the closely related areas stated above. Such interactions which usually result in the integration of different systems or approaches are certainly much needed to achieve some performance breakthrough while individual systems or approaches reach their performance limit. I am grateful to all participants for their active participation that makes the Workshop very productive, and to Dr. Lewis J. Lloyd and Dr. Ralph Goodman for their help to arrange an informative visit to the SACLANT ASW Research Centre for the Workshop participants. I am confident that this publication will be equally produc tive to report important current research results and near-future research activity particularly in underwater acoustic signal processing.
Download or read book Passive Underwater Target Tracking Using Bearings only Measurements written by Sanagapallea Koteswara Rao and published by LAP Lambert Academic Publishing. This book was released on 2012-06 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this book, passive target tracking using bearings-only measurements is studied for several underwater applications. For submarine (ownship) to submarine (target) application, Pseudo Linear Estimator and its variants are developed for various situations. The algorithm is extended to Electronic Surveillance Measures in Electronic Warfare / Intercept sonar target tracking application, where the measurements are highly aperiodic. In underwater, prior information of the target motion parameters will not be available. Therefore, Pseudo Linear Estimator is developed in such a way to work without initialization of target state vector. As this does not require statistical characteristics of noise, this can be safely used as a back up algorithm, along with any variant of Kalman filter.
Download or read book Control and Dynamic Systems V29 written by C.T. Leonides and published by Elsevier. This book was released on 1988-01-01 with total page 325 pages. Available in PDF, EPUB and Kindle. Book excerpt: Control and Dynamic Systems: Advances in Theory in Applications, Volume 29: Advances in Algorithms and Computational Techniques in Dynamic Systems Control, Part 2 of 3 discusses developments in algorithms and computational techniques for control and dynamic systems. This volume discusses some computational problems which arose in the applications of Kalman filters. It also examines system fault detection techniques; computational techniques in angle-only tracking filtering; development of real-time knowledge of system parameters; and algorithms for decentralized systems with application to stream water quality. This book is an important reference for practitioners in the field who want a comprehensive source of techniques with significant applied implications.
Download or read book Adaptive Estimation Techniques for Tracking Airborne and Underwater Maneuvering Targets written by Denis Hugh McCabe and published by . This book was released on 1979 with total page 634 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Tracking of Maneuvering Targets written by Hongren Zhou and published by . This book was released on 1984 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Target Tracking in Multipath and Glint Environments and Adaptive Radar Scheduling written by Ehsan Daeipour and published by . This book was released on 1996 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Estimating the Motion of a Maneuvering Targets Using Passive Measurements written by B. D. Tapley and published by . This book was released on 1980 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt: The problem of estimating the trajectory of a maneuvering target using passive measurements obtained from an array of stationary sensors is investigated. The formulation is considered in a two-dimensional rectangular coordinate system. The unknown acceleration components are modelled as Brownian motion processes and consequently the dynamic model is linear. The types of measurements used in the estimation process are the frequency and the bearing angle of some are nonlinear functions of the state vector which consists of a reference frequency and the components of position, velocity and acceleration. Computation algorithms for Extended Kalman Filter and 'batch-sequential' filter are presented. Equations for including the effects of process noise on the batch solution are derived and the computation algorithm is also given. The performance of these filters is compared using noisy measurements simulated for two different scenarios with typical target maneuvers and sensor locations. Extended Kalman Filter is found to be the best in terms of computation time and accuracy of the estimated trajectory. Sensors located as far apart as feasible yield better results than those which are closer to each other. (Author).
Download or read book Oceans 93 written by Oceanic Engineering Society (U.S.). Victoria Chapter and published by Institute of Electrical & Electronics Engineers(IEEE). This book was released on 1993 with total page 534 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Adaptive Approaches to Manoeuvering Target Tracking written by Murat Efe and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book ICASSP 84 written by and published by . This book was released on 1984 with total page 712 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Passive Multipath Target Tracking in an Inhomogeneous Acoustic Medium written by Amnon Shefi and published by . This book was released on 1987 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt: Tracking a maneuvering acoustic source using multipath (MP) arrivals in an inhomogeneous (IH) ocean medium is investigated. Errors introduced by a horizontally stratified sound speed profile are quantitatively evaluated. A new method of converting MP time difference of arrivals to depth and range which accounts for the IH effect is developed and evaluated. A 3-D target tracker previously used in MP tracking is modified in order to remove estimation biases and improve computational efficiency. Tracking performance is demonstrated using extensive simulation and shown to be greatly improved. Keywords: Three dimensional; Prefilters; Underwater; Maneuvering targets.
