Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 30 for “"target localization"”.
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Target localization in MIMO radar systems
… joint processing of the received echoes from the target. MIMO radar has been receiving increasing attention in recent years from researchers, practitioners, and funding agencies. Elements of MIMO radar have the ability to transmit diverse waveforms ranging from independent to fully correlated. …
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Target localization in MRI-guided prostate biopsy
… is the most definitive form of cancer diagnosis. Target-specific biopsies can be performed under magnetic resonance imaging (MRI) guidance. However, needle placements are often inaccurate due to intra-operative prostate motion and the lack of motion compensation techniques. As a result, malignant …
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Target localization in passive and active systems : performance bonds
… to develop ways to predict the performance of localization techniques as a function of signal-to-noise ratio (SNR) and of system parameters. To this end, lower bounds on the maximum likelihood estimator (MLE) performance are studied. The Cramer-Rao lower bound (CRLB) for coherent passive …
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Sparsity based methods for target localization in multi-sensor radar
… several sparsity-based methods for ground moving target indicator (GMTI) radar with multiple-input multiple-output (MIMO) random arrays are proposed. MIMO random arrays are large arrays that employ multiple transmitters and receivers, the positions of the transmitters and the receivers are …
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Trajectory optimization for target localization using small unmanned aerial vehicles
… involves computing location estimates for targets detected by onboard sensors. Combining UAV state estimates with information gathered by the imaging sensors leads to bearing measurements of the target that can be used to determine the target's location. This 3-D bearings-only estimation …
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Navigation and target localization performance of the autonomous underwater vehicle REMUS
… sensor data and increasing the reliability of target reacquisition.
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A Bayesian Framework for Multi-Stage Robot, Map and Target Localization
… for a mobile robot to localize itself and a target, while building a map of the environment. The proposed technique builds upon the Bayesian Simultaneous Robot Localization and Mapping (SLAM) method, to allow the robot to localize itself and the environment using map features or landmarks in …
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Vision-based Target Localization from a Small, Fixed-wing Unmanned Air Vehicle
… when imaged from a fixed-wing UAV. Using the target's pixel location in an image, with measurements of UAV position, attitude and camera pose angles, the target is localized in world coordinates. This thesis also presents a study of possible error sources and localization sensitivities to each …
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Video Stabilization and Target Localization Using Feature Tracking with Video from Small UAVs
… Next, the thesis proceeds to extend previous target localization work by allowing the operator to easily identify targets—rather than relying solely on color segmentation—to improve reliability and applicability in real world scenarios. The resulting approach creates a low cost and easy to use …
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The Effects of Rewards on the Ability of an Autonomous UAV Controlled by a Reinforcement Learning Agent to Accomplish a Target Localization Task
… a Reinforcement Learning agent to accomplish a target localization task were investigated. The numerical values of the reward scheme were varied. It was expected that with an increase in the reward obtained by a learning agent upon correct detection the systems will become more risk tolerant and …
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The Effects of Sensor Performance as Modeled by Signal Detection Theory on the Performance of Reinforcement Learning in a Target Acquisition Task
… on the ability of RL algorithms to accomplish a target localization task are examined. Three levels of sensor sensitivity are simulated and compared to the results of the same system using a perfect sensor. To accomplish the target localization task, a hierarchical architecture used two distinct …
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Non-Field-of-View Acoustic Target Estimation
… to Non-Field-of-view (NFOV) sound source localization and tracking in indoor environments. The approach takes advantage of sound signal information to localize target position through auditory sensors combination with other sensors within grid-based recursive estimation structure for …
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Aircraft state estimation using cameras and passive radar
Multiple target tracking (MTT) is a fundamental task in many application domains. It is a difficult problem to solve in general, so applications make use of domain specific and problem-specific knowledge to approach the problem by solving subtasks separately. This work puts forward a MTT framework …
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Asymptotic methods in applied waveguide problems
… of scattered fields in waveguides caused by targets of elaborate shape. The complexity of the resulting scattered field depends on the geometry of the scatterer, and exact solutions exist only for the simple geometries. The asymptotic methods developed in this dissertation give the …
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A hierarchical framework for constructing computationally efficient algorithms for distributed inference problems
… The problem is to gain intelligence about targets in the environment from the information collected by a set of sensor nodes which are distributed over a field and have real physical constraints on energy and communication. In particular, solutions to the problem of information collection …
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Collaborative Tarrget Localization and Inspection Using a Heterogeneous Team of Autonomous Vehicles
… the route, the aircraft searches for possible targets. If a target is detected, the approximate coordinates are sent over the network and the ground vehicle then further localizes and inspects the target. Once the inspection is completed, the ground vehicle continues on its previous route. This …
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Characterization of Laminated Magnetoelectric Vector Magnetometers to Assess Feasibility for Multi-Axis Gradiometer Configurations
… proximity and the signal processing needed for target localization. The goal for this project is to closely examine the single axis ME sensor response in different orientations with a moving magnetic dipole to assess the field detection capabilities. Multiple sensors were tested together to …
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