1262 results about "Position tracking" patented technology

The apparatus and method measure the three-dimensional surface shape of a surface without contact with the surface, and without any physical constraint on the device during measurement. The device is a range-sensor or scanner, and in one embodiment is a laser-camera sensor, which has a portable camera and multi-line light projector encased in a compact sensor head, and a computer. The apparatus provides three-dimensional coordinates in a single reference frame of points on the surface. The sensor head does not have to be physically attached to any mechanical positioning device such as a mechanical arm, rail, or translation or rotation stage, and its position in three-dimensional space does not have to be measured by any position-tracking sensor. This allows unrestricted motion of the sensor head during scanning, and therefore provides much greater access to surfaces which are immovable, or which have large dimensions or complex shape, and which are in confined spaces such as interior surfaces. It also permits measurement of a surface to be made by a continuous sweeping motion rather than in stages, and thus greatly simplifies the process of measurement. The apparatus can be hand-held, mounted on any moving device whose motion is unknown or not accurately known, or airborne. The apparatus and method also permit unknown and unmeasured movement of the object whose surface is to be measured, which may be simultaneous with the movement of the range-sensor head.

A method and apparatus for avoiding collisions of moving vehicles in an environment that utilizes a position and rotational orientation system to track vehicle locations within a preconfigured operational zone, the method comprising using position tracking data to calculate a predicted trajectory and safety zone of each vehicle for a predetermined prediction time period and determining potential areas of intersection with vehicles to predict collisions.

We have disclosed a modular personal network (MPN) that includes multiple devices that may be worn, carried, or used in close proximity to a user. The devices communicate wirelessly. Functions of the MPN may be modified by adding or removing components. The MPN may communicate with a personal computer. General purpose devices may include a control unit, a display, a user input, and an audio output. The MPN may provide a variety of functions, including time, communication, entertainment, organization, guidance, athletic, medical, travel, outdoors, identity, security, and military.

A magnetic position tracking system for performing a medical procedure on a patient who is positioned on an upper surface of a table includes a location pad, which is positioned on the upper surface of the table beneath the patient. The location pad includes one or more field generators, which are operative to generate respective magnetic fields and are arranged so that a thickness dimension of the location pad is no greater than 3 centimeters. A position sensor is fixed to an invasive medical device for insertion into a body of the patient, and is arranged to sense the magnetic fields so as to measure a position of the medical device in the body.

A position tracking device is disclosed combining one or more optical sensors in a housing with a medical device. The medical device may be an insertion device or one that produces radiant energy. The device may utilize an on-board processor or an external processor to track position data generated by the optical sensors and correlate the treatment regime of the medical device. Alternative embodiments and methods of use are also described.

The wireless radio-frequency identification (RFID) picocellular system includes a central control station optically coupled to one or more electrical-optical (E-O) access point devices that generate the individual picocells. The central control station includes service units that provide conventional wireless cellular services, and further includes one or more RFID reader units. The E-O access point devices are adapted to receive electromagnetic RFID tag signals from RFID tags within the associated picocell and transmit optical RFID tag signals to the central control station, which converts the optical RFID tag signals to electrical RFID tag signals, which are then received by the one or more RFID reader units. The system allows for large numbers of RFID tags in the picocellular coverage area to be quickly read and the information stored. The relatively small size of picocells allows for high-precision locating and position tracking of items without the need for manually scanning RFID tags with an RFID reader.

The invention relates to the technical field of mobile robot autonomous navigation and discloses a service mobile robot navigation method in a dynamic environment. The service mobile robot navigation method in the dynamic environment includes the following steps that firstly, position tracking of people can be achieved by utilizing multiple global cameras and robot vehicle-mounted laser sensors in an indoor environment; secondly, the moving mode of people under a specific indoor environment site is trained according to collected samples, and the moving trend of people is predicated; thirdly, a current position and a predicated position of people are merged with an environment static obstacle raster map, and a navigation risk probability map is generated; fourthly, a robot navigation movement controller of a global route planning-local obstacle avoidance control gradational structure is adopted to control robot navigation behavior, and safe and efficient navigation behavior of a robot under a complex dynamic environment where the robot coexists with people is ensured through controlling.

An exemplary method includes selecting a first pair of electrodes to define a first vector and selecting a second pair of electrodes to define a second vector; acquiring position information during one or more cardiac cycles for the first and second pairs of electrodes wherein the acquiring comprises using each of the electrodes for measuring one or more electrical potentials in an electrical localization field established in the patient; and determining a dyssynchrony index by applying a cross-covariance technique to the position information for the first and the second vectors. Another method includes determining a phase shift based on the acquired position information for the first and the second vectors; and determining an interventricular delay based at least in part on the phase shift.

A position-tracking system for tracking the position of an object is disclosed. According to various embodiments, the tracking system includes a tracking device that is connected to or otherwise affixed to the object to be tracked. The tracking device may include, among other things, an inertial sensor assembly, radio transceivers and a processor. The position tracking system may also include a host processing system that is in communication with the tracking device. The position tracking system may provide variable-resolution position information based on the environment in which the object is moving. In a “wide resolution” area, the system may compute a general position for the object based on a wireless telephone network Cell-ID / map correlation architecture. In a high-resolution area, greater position resolution may be realized from the combination of a wireless aiding system and inputs from the inertial sensors. In the high-resolution mode, the system may exploit distinct patterns of motion that can be identified as motion “signatures” that are characteristic of certain types of motion. Kinematic (or object movement) models may be constructed based on these motion signatures and the position tracking system may estimate the state of the object based on the kinematic model for the current mode of the object. Adaptive and cascaded Kalman filtering may be employed in the analysis to more accurately estimate the position and velocity of the object based on the motion pattern identified.