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 29 for “"position tracking"”.
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Direct position tracking in GPS using vector correlator
… of individual satellite signals and estimate the position and velocity of the receiver using trilateration. Different from this two-step approach, direct maximum likelihood estimation of position has proved to be beneficial in weak signal and multipath environments. In this thesis, an architecture …
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Investigation of the Potential of Low Cost Position Tracking Using Permanent Magnets
… such as ultrasound. Permanent magnet based tracking systems potentially offer adequate tracking accuracy and workspace size for limited clinical adoption. This thesis investigates the development of such a tracking system, in order to facilitate future work in developing this technology. …
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Smart Environment Based On Real-Time Human Position Tracking For Remote Presence And Collaboration
… system. The prototype of a detection and tracking algorithm to extract the location information was developed using background subtraction in MATLAB. The proposed approach was developed using the combination of background subtraction and neural networks along with heuristics based on …
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On-chip magnetic sensor and readout design for 3D position tracking in image-guided interventions
Electromagnetic tracking (EMT) technology is integral to complex medical procedures, providing precise real-time tracking of surgical instruments while reducing dependence on radiation-based imaging. EMT is particularly beneficial in various image-guided interventions, enhancing accuracy and …
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A Hybrid Adaptive and Robust Control Methodology With Application to Active Vibration Isolation
… actuation. Two new methods, the velocity-tracking approach and the position-tracking approach, are proposed and implemented in a custom-built multiple degree-of-freedom active vibration isolation testbed. These approaches circumvent the fundamental bandwidth limitations associated with …
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Improvement of position and orientation tracking accuracy by fusing HTC Vive trackers and Inertia Measurement Units
Position tracking systems have been used for calibration, error compensation and navigation of robots to enable higher precision machining, assembly, or control. Laser trackers are the most common position tracking system in the aerospace industry despite the high price. They can track minute …
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Modeling, identification and control of a quad-rotor drone using low-resolution sensing
… stages --- local references following and global position tracking. PID algorithm is used by both controllers with various filters designs, such as low/high pass filter, Complementary Filter and Kalman Filter. Simulation is also divided to two stages with two different simulators ---- MATLAB and …
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Vision based iterative learning control for a roll to roll micro/nano-manufacturing system
… Control (ILC) can thereby be used to improve the position tracking precision, as well as the web tension regulation. We seek to further improve the position tracking performance by combining ILC with direct visual observation on the pre-existing features on the web. The pre-existing features may …
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Automatic Landing of a Rotary-Wing UAV in Rough Seas
… control system with gust-attenuation and rapid position tracking capabilities. A feedback-feedforward controller has been devised for height stabilization in a windy environment based on the construction of an effective gust estimator. Flight tests have been conducted to verify its performance, …
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Design, fabrication, and modeling of sensing, knitted structures
… to capture the full articulation of a motion or position. These customized sensing systems often consist of flexible sensor arrays that can measure local mechanical deformations. Often times these sensors have complex fabrication processes and require unique design solutions for specific …
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Effect of friction and control parameters on the tracking accuracy of a target seeker
The tracking accuracy of a missile target seeker depends on many variables. For a target seeker using a gimbaled platform, an important variable is the friction induced by the preloaded bearings, and by the short wires which connect the target detector with the rest of the seeker's electronics. …
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Neural network-based control of flexible-link manipulators
… non-colocated nature of the sensor and actuator position, which results in unstable zero dynamics. Further complications arise because of the highly nonlinear nature of the system and the difficulty involved in accurately modeling various friction and backlash terms. Control strategies that …
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A Device Compatible with Functional Magnetic Resonance Imaging for Assessing Brain Activity During a Finger Force Tracking Motor Task
… compared in an able-bodied subject to a similar position-tracking task from the literature. Force tracking elicited a greater spatial extent of neural activation, and also allowed the user to more accurately follow the visual track. This is the first hand extensor force sensor developed for this …
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Electromagnetic Tracking for Medical Imaging
… the novel use of a wireless electromagnetic: EM) tracking device in a Computed Tomography: CT) environment. The sources of electromagnetic interference inside a Philips Brilliant Big Bore CT scanner are analyzed. A research version of the Calypso wireless tracking system was set up inside the CT …
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Localization And Mapping Of Unknown Locations And Tunnels With Unmanned Ground Vehicles
… within tunnels: (1) localization (e.g., position tracking) and mapping of its environment, (2) traversing varied terrains, (3) sensing the environment for objects of interest, and (4) increasing the level of autonomy of UGVs available at the ERDC. The simulation experiments were performed …
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Hierarchical control of complex manufacturing processes
… The proposed method was implemented for contour-position control of motion systems as well as force-position control of end milling processes. It was shown for a motion control system, when contour tracking is important, the controller can reduce the contour error even when the axial control …
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Development of an integrated tracking control algorithm and a test platform for autonomous excavation
… for excavation is introduced considering the position, contour, and force which are mutually associated factors for successful autonomous excavation. For position tracking of the bucket tip, a non-linear PI controller was devised to control the hydraulic actuators of the boom, arm, and bucket …
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Visual servo control on a humanoid robot
… achievement of tasks such as reaching a desired position, tracking or/and grasping an object. The autonomy of humanoid robots is considered as crucial for the success of the numerous services that this kind of robots can render with their ability to associate dexterity and mobility in structured, …
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An Automated Ultrasound Calibration Framework Incorporating Elevation Beamwidth for Tracked Ultrasound Interventions
… technology that uniquely combines US imaging and position tracking, has been increasingly used for intraoperative guidance in surgical interventions. The intrinsic accuracy of a tracked US system is primarily determined by a unique procedure called ``probe calibration", where a spatial …
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