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 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 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 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 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 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 Adaptive Tracking of Maneuvering Targets Based on IR Image Data written by Peter S. Maybeck and published by . This book was released on 1989 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: The capability of tracking dynamic target from forward looking infrared (FLIR) measurements has been improved substantially by replacing standard correlation trackers with adaptive extended Kalman filters or enhanced correlator/Kalman filter combinations. This research investigates a tracker able to handle multiple hot-spot targets, in which digital and/or optical signal processing is employed on the FLIR data to identify the underlying target shape. Furthermore, multiple model adaptive filtering is investigated as a means of changing the field-of-view as well as the tracker bandwidth when target acceleration can vary over a wide range. Enhancements are developed and analyzed: 1) allowing some of the elemental filters within the adaptive algorithm to have rectangular fields-of-view and to be tuned for target dynamics that are harsher in one direction than others, 2) considering both Gauss-Markov acceleration models and constant turn-rate models for target dynamics, and 3) devising an initial target acquisition algorithm to remove important biases in the estimated target template to be used within the tracker. The performance potential of such a tracking algorithm is shown to be substantial.
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 Autonomous Adaptation and Collaboration of Unmanned Vehicles for Tracking Submerged Contacts written by Andrew Jamie Privette and published by . This book was released on 2012 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt: Autonomous operations are vital to future naval operations. Unmanned systems, including autonomous underwater vehicles (AUVs) and autonomous surface vehicles (ASVs), are anticipated to play a key role for critical tasks such as mine countermeasures (MCM) and anti-submarine warfare (ASW). Addressing these issues with autonomous systems poses a host of difficult research challenges, including sensing, power, acoustic communications, navigation, and autonomous decision-making. This thesis addresses the issues of sensing and autonomy, studying the benefits of adaptive motion in overcoming partial observability of sensor observations. We focus on the challenge of target tracking with range-only measurements, relying on adaptive motion to localize and track maneuvering targets. Our primary contribution has been to develop new MOOS-IvP autonomy and state estimation modules to enable an autonomous surface vehicle to locate and track a submerged contact using range-only sensor information. These capabilities were initially tested in simulation for increasing levels of complexity of target motion, and subsequently evaluated in a field test with a Kingfisher ASV. Our results demonstrate the feasibility, in a controlled environment, to localize and track a maneuvering undersea target using range-only measurements.
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 Technical Abstract Bulletin written by and published by . This book was released on 1980 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Target Tracking Onboard an Autonomous Underwater Vehicle written by Maria Alejandra Parra-Orlandoni and published by . This book was released on 2007 with total page 109 pages. Available in PDF, EPUB and Kindle. Book excerpt: In order to overcome the challenges that an anisotropic noise field poses for underwater target tracking, we conduct an onboard estimation of the horizontal noise directionality in the real-time processing suite of an autonomous underwater vehicle (AUV) towing a horizontal line array. The estimation of the noise directionality is a precursor to another adaptive behavior: optimizing tracking capability of a towed array by choosing a particular heading that minimizes the detection level in the target's direction. In each distinct simulated anisotropic noise field, the AUV successfully calculates the optimal towed array headings based on the real-time estimation of the horizontal noise directionality. The findings reveal a clear advantage over the conventional broadside beam tracking method, with some limitations due predominantly to the noise field itself.
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 Adaptive Sensing for Target Tracking Applications written by Aashish Poudel and published by . This book was released on 2011 with total page 87 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Sensor Management for Target Tracking with Sensor Deployment and Motion Uncertainties written by K. Punithakumar and published by . This book was released on 2003 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:
