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公开(公告)号：US11726585B2
公开(公告)日：2023-08-15
申请号：US17473995
申请日：2021-09-13
CPC分类号： G06F3/038 , G01D5/2006 , G01S1/7036 , G01S1/7038 , G06F3/011 , H01F7/064 , G06F3/014 , G06F3/017
摘要： Circuits for controlling magnetic-based tracking systems are described. These systems may be used in virtual reality applications, for example to track in real-time the location of one or more body parts. The systems use a beacon emitting mutually orthogonal magnetic fields. On the receiver side, one or more sensors disposed on different parts of a body receive the magnetic fields. The beacon includes switching amplifiers for driving the magnetic field emitters. Being binary, these amplifiers may be controlled by binary signals. The circuits may exhibit a resonant frequency response, and may be operated off-resonance, thus providing for a better control of the magnetic fields amplitude. As a result, however, fluctuations in the envelop of the magnetic fields due to the presence of a beating tone may arise. These fluctuations may be shortened by gradually activating the drivers for the magnetic field emitters.
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2.发明授权公开(公告)号：US11994606B2
公开(公告)日：2024-05-28
申请号：US17620953
申请日：2020-06-29
申请人： SIGNIFY HOLDING B.V.
IPC分类号： G01S5/16 , G01S1/70 , H05B47/115 , H05B47/195
CPC分类号： G01S5/16 , G01S1/7036 , H05B47/115 , H05B47/195
摘要： A system is configured to obtain locations of a mobile device (1) and obtain presence detection information. The locations are determined using visible light signals and dead reckoning information recorded at different moments. The presence detection information indicates presence detected using presence sensor devices (31, 32) at the different moments. The system is further configured to obtain sensor locations and sensor fields of view, determine sensor orientations based on the locations of the mobile device, the sensor locations and the presence detection information, and determine a sensor coverage area (61, 62), comprising gaps in the sensor coverage area, based on the sensor locations, the sensor orientations and the sensor fields of view. The system is also configured to determine one or more parameters for presence detection based on the gaps in the sensor coverage area and output the parameters or a presence detection result which has been determined using the parameters.
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公开(公告)号：US11958580B2
公开(公告)日：2024-04-16
申请号：US17096246
申请日：2020-11-12
IPC分类号： H04B10/00 , B63B21/50 , B63B22/00 , B63B35/04 , B63B49/00 , B63B79/15 , B63B79/40 , B63G8/00 , G01S1/04 , G01S1/08 , G01S1/70 , G01S1/74 , G01S1/76 , G05D1/00 , H04B10/25
CPC分类号： B63G8/001 , B63B21/50 , B63B22/003 , B63B35/04 , B63B49/00 , B63B79/15 , B63B79/40 , G01S1/0426 , G01S1/08 , G01S1/7036 , G01S1/752 , G01S1/76 , G05D1/0692 , H04B10/25
摘要： An underwater communications network may include spaced apart nodes on a bottom of a body of water. The underwater communications network may also include fiber optic cabling connecting the spaced apart nodes. Each node may include a frame, a node short-range navigation device carried by the frame, and an unmanned underwater vehicle (UUV) carried by the frame after delivering a fiber optic cable along a navigation path from an adjacent node. The UUV may be configured to cooperate with the node short-range navigation device during an end portion of the navigation path adjacent the frame.
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公开(公告)号：US11879959B2
公开(公告)日：2024-01-23
申请号：US17686924
申请日：2022-03-04
发明人： Gilray Densham , Andrew Gordon
CPC分类号： G01S1/7036 , G01S5/16
摘要： A tracking beacon is provided that is trackable using image sensors. The beacon includes a housing with a lower portion and an upper portion. The upper portion include a light diffusing structure with protrusions to help scatter the emitted light in different directions. A light source is positioned within the housing, and electrical contacts are positioned on an external surface of the lower portion.
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