Results 201 to 210 of about 1,285,259 (263)
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Linear bearing device as a solution for optical navigation of fine needle procedures
Technology and Health Care, 2010Optical navigation of needles < 1 mm diameter remains a challenging task. Bending of these tools is the limiting factor.To use a conventional optical navigation system for interventional fine needle procedures.A novel custom-made device was constructed to guide the needle in the direction of the planned trajectory.
Volker Stüber +6 more
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Joint Line Changes After Navigation-Assisted Mobile-Bearing TKA
Orthopedics, 2009The purpose of this study was to analyze the clinical results of patients who underwent navigation-assisted cruciate ligament retention-type mobile-bearing total knee arthroplasty (TKA) according to joint line changes. From September 2004 to January 2006, cruciate ligament retention-type mobile-bearing TKAs were performed using a navigation system ...
Jae Hyuk Yang +3 more
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IEEE Transactions on Aerospace and Electronic Systems, 2022
This article proposes a computationally lightweight marginalized particle filtering (MPF) algorithm with improved filter consistency. For mixed linear/nonlinear state-space models such as terrain referenced navigation (TRN) models, an MPF can improve the
Yeongkwon Choe, J. Song, Chan Gook Park
semanticscholar +1 more source
This article proposes a computationally lightweight marginalized particle filtering (MPF) algorithm with improved filter consistency. For mixed linear/nonlinear state-space models such as terrain referenced navigation (TRN) models, an MPF can improve the
Yeongkwon Choe, J. Song, Chan Gook Park
semanticscholar +1 more source
Autonomous Distributed Angles-Only Navigation and Timekeeping in Lunar Orbit
The International Technical Meeting of the The Institute of Navigation, 2022This paper demonstrates an algorithmic framework for autonomous, distributed navigation and timekeeping for spacecraft swarms and constellations using angles-only measurements from onboard cameras.
K. Iiyama, J. Kruger, S. D’Amico
semanticscholar +1 more source
Observability Criteria and Unobservable Maneuvers for In-Orbit Bearings-Only Navigation
Journal of Guidance, Control, and Dynamics, 2014This paper provides an analytical derivation of the observability conditions for in-orbit bearings-only navigation that can also be used to solve for the conditions under which unobservable maneuvers occur. The derivation is performed in a rigorous yet relatively simple manner by attempting to solve for the initial conditions in a discrete formulation ...
J. Grzymisch, Walter Fichter
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A Mapless Navigation Method Based on Deep Reinforcement Learning and Path Planning
IEEE International Conference on Robotics and Biomimetics, 2022The ability of mobile robots to navigate in an unfamiliar environment in human terms is decisive for their applicability to practical activities. Bearing this view in mind, we propose a novel framework for navigation in settings where the environment is ...
Jinzhou Wang, Ran Huang
semanticscholar +1 more source
Trajectory characterizations for a discrete-time bearing-only navigation strategy
2008 16th Mediterranean Conference on Control and Automation, 2008In this paper we explore the geometry of a particular navigation scheme which guides a pursuer from a fixed initial position to a given fixed final position using a one-step look ahead strategy and using only bearing measurements. We explicitly characterize the optimal trajectories for the problem in terms of the Cramer-Rao bound such that the derived ...
Pubudu N. Pathirana, Adrian N. Bishop
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Topographical Landmarks for Ground-Level Terrain Relative Navigation on Mars
IEEE Aerospace Conference, 2022Many of the tasks planned for future generation Mars rovers rely heavily on having accurate knowledge of the rover's location in a Martian body-fixed coordinate system.
J. V. Hook +4 more
semanticscholar +1 more source
Computer Navigation: Improving Outcomes with Hard on Hard Bearings
2007The design and manufacture of ceramic implants has improved significantly over the last decade. Consequently the use of ceramic-on-ceramic bearings in total hip replacement has become increasingly popular with over 150,000 components having been implanted in Europe [1].
Robert Middleton +2 more
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Nonlinear pseudo-measurement filtering for in-orbit bearings-only navigation
IEEE Transactions on Aerospace and Electronic Systems, 2015In-orbit rendezvous is a key enabling technology for many space missions that already enjoys significant heritage. However, complex hardware is generally required in order to measure the relative range. Achieving rendezvous employing only bearing/angle measurements would simplify the relative navigation hardware currently required, increasing ...
Walter Fichter, J. Grzymisch
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