49results about "Beacon systems using electromagnetic waves" patented technology

The device (100) for tracking an object (200), comprising means for attaching to said object (200), a wireless communication circuit (102), at least two antenna modules (104) having respective positions different from one another, and at least one processor (108) configured to: - select one of the at least two antenna modules (104) based on information indicative of a best-oriented antenna module for wireless communication among the at least two antenna modules; - transmit or receive one or more signals for tracking said object (200) using the wireless communication circuit (102) and the selected best-oriented antenna module (104).

Certain aspects of the present disclosure provide techniques and apparatus for training and using machine learning models to predict a layout of a spatial area based on an input data set of samples from the spatial environment. An example method generally includes receiving an input data set including a plurality of samples from a spatial area. Each sample of the plurality of samples generally includes at least channel state information data. A machine learning model is trained to predict a layout of the spatial area based on the input data set. The predicted layout of the spatial area generally includes a plurality of bounding boxes defining different regions of the spatial area.

Electronic device comprising: - a lighting device, capable of illuminating a room or the like; - a photodetector; - an ultra-wideband pulse transmitter; - an ultra-wideband pulse receiver; - a controller, connectable to the internet; wherein the controller is adapted for coding a signal and transmitting it to the lighting device and / or to the pulse transmitter, and for decoding a signal received by the photodetector or the pulse receiver; wherein the lighting device is adapted to transmit the signal as a LiFi signal and the pulse transmitter is adapted to transmit the signal as a UWB signal.

To determine the relative position (RL) of a missile (4) with respect to a target axis (18), a transmitter (24) emits a laser guidance field (26) with a pattern (30) varying and rotating around the target axis (18) along the target axis (18). The current intensity (IA1-3) of the laser guidance field (26) is recorded at three different measurement points (MP1-3) at known measurement positions (ML1-3) on the missile (4). From this, a difference (DPA,B) of polar angles (PW) between the two measurement points (MP1-3) of each pair (PA,B) with respect to the target axis (18) is determined for at least two different pairs (PA,B) of the three measurement points (MP1-3). The relative position (RL) is then determined as the offset (AL) of the roll axis (28) from the target axis (18) and the rotation angle (DW) of the missile (4) about the roll axis. (28) determined with respect to a zero angle (NW).To guide a guided missile (4), the above procedure is carried out for the guided missile as missile (4) and the guidance device (16) is controlled towards the target axis (18) depending on the relative position (RL). A missile assembly (22) includes the aforementioned transmitter unit (24), which emits the laser guidance field (26), and the missile (4), which determines the relative position (RL).

A retrofittable tracking device for a land vehicle is proposed. The retrofittable tracking device comprises a fastening means for attaching the retrofittable tracking device to the land vehicle and a water sensor configured to detect contact with water. Furthermore, the retrofittable tracking device comprises a control circuit configured to control at least one ultrasonic transducer of the retrofittable tracking device to output an ultrasonic signal when the water sensor detects contact with water. Alternatively or additionally, the control circuit is configured to control at least one light source of the retrofittable tracking device to output a light signal when the water sensor detects contact with water.

To provide an optical receiving unit for a position measuring system for determining spatial position information, the optical receiving unit certainly preventing faulty measurement even under mechanical and / or thermal stress.SOLUTION: The present invention relates to an optical receiving unit for a position measuring system for determining spatial position information. The receiving unit has a measuring cell. The measuring cell includes a base plate, a transparent cover plate with a scanning grating, one or more spacers between the base plate and the cover plate, and an optoelectronic detector whose light-sensitive surface is oriented in the direction of the cover plate. The detector is arranged on the base plate of the measuring cell via a self-centering compensating element.SELECTED DRAWING: Figure 2

The invention discloses a multimode personal positioning search and rescue beacon which comprises a support and a multimode beacon body used for positioning search and rescue of individuals, a mounting cavity is formed in the support, and a horizontal rotation adjusting mechanism is arranged in the mounting cavity. The multi-mode letter body can be rotationally adjusted along the front-back pitch angle and can also be rotationally adjusted along the angle position in the horizontal direction, and the rotary adjustment of the angle position in the horizontal direction and the adjustment of the front-back pitch angle of the multi-mode letter body can be matched at the same time; therefore, the multi-mode beacon body can be adjusted in any direction, so that the multi-mode beacon body can transmit a search and rescue signal at a better angle position, and the situations that in the past, people need to continuously and manually change the beacon direction, consequently, arm fatigue is easily caused, and positioning signals are easily interrupted are avoided. The beacon can fully play a role, it is ensured that position information positioning is more accurate, and adaptability is higher.

A system 10 for tracking movement of an object 12 in a three-dimensional (3D) environment, such as a vehicles driving on a motor racing circuit, comprises at least one emitter 14 provided on the objec

An unmanned aerial vehicle (UAV) 100 carries an optically pumped magnetometer 110 for detecting a signal from a magnetic beacon. The UAV has one or more rotors 106 which produce a noise signal. The ma

The present invention provides a temperature-salinity-depth instrument measurement system, which belongs to the field of deep-sea detection technology. The system comprises a plurality of temperature-salinity-depth instruments and a host computer. The temperature-salinity-depth instruments are used to detect the electrical conductivity and temperature of water bodies at different depths in a plurality of ocean regions in a sea area to be measured. The temperature-salinity-depth instruments are provided with a magnetic weight for sinking in water and an energized demagnetization module, which is used to sink to the seabed when the temperature-salinity-depth instruments are deployed and to separate the magnetic weight. The host computer is provided with a deployment allocation module, a data receiving module, a data analysis module and an equipment tracking module. The deployment allocation module is used to determine the deployment position of each temperature-salinity-depth instrument according to ocean parameters of the sea area to be measured; the data receiving module is used to receive detection data collected by each temperature-salinity-depth instrument; the data analysis module is used to calculate the electrical conductivity and temperature model of all positions in the sea area to be measured based on the data collected by all the temperature-salinity-depth instruments; and the equipment tracking module is used to calculate the current position of the temperature-salinity-depth instrument to facilitate recovery of the temperature-salinity-depth instrument by recovery personnel.

The invention relates to a beacon system based on a hollow-core optical fiber, and the system employs the hollow-core optical fiber to transmit laser to a far-end optical processing unit, and the far-end optical processing unit carries out the optical processing of the laser, so as to generate visible light. The technical scheme provided by the invention has the beneficial effects that 1, the weight per unit length of the hollow-core optical fiber is far lower than that of a copper-core cable, and the extremely light dead weight enables the length of the used optical fiber to be far greater than that of the cable when the same weight load is reached, so that the effective laying radius of the beacon system is greatly expanded, and the service life of the beacon system is prolonged; the core bottleneck that the working distance is limited by the dead weight of the cable is solved. 2, the hollow-core optical fiber transmits laser energy, and Joule heat loss caused by the resistance effect of the cable is avoided in the transmission process of the hollow-core optical fiber; and secondly, the far-end optical processing unit is used for performing optical processing on the laser to generate visible light, so that energy loss in the electro-optical conversion process is avoided. By means of the end-to-end light-to-light conversion path, the energy utilization rate is greatly improved.

A headset for use in displaying a virtual image of a building information model (BIM) in relation to a site coordinate system of a construction site and a method for tracking a portable tool at a construction site. Both comprise deriving a transformation between a real-world coordinate system and an intrinsic coordinate system of a positional tracking system. The headset is communicatively coupled to one or more position-tracking sensors mounted thereon, has an augmented reality display system, and an electronic control system. The electronic control system is configured to convert a BIM model defined in an extrinsic, real world coordinate system into an intrinsic coordinate system defined by a position tracking system, receive headset tracking data from a headset tracking system and render a virtual image of the BIM relative to the position and orientation of the headset on the construction site which is viewable by the user as a virtual image of the BIM.

An optical wireless communication device (100) comprising: a two-dimensional array of emitters (110) each emitter arranged to emit an optical signal and having an individual coverage area; wherein the two-dimensional array of emitters (110) is arranged to create a combined coverage area larger than the individual coverage area, with each individual coverage area evenly distributed within the combined coverage area; a receiver (120) configured to receive a feedback from a remote device in the combined coverage area; and a controller (101) configured to assign an address to each emitter out of the two-dimensional array of emitters, each address comprising a pair of codes representing coordinates on an X-axis and a Y-axis, respectively, according to a Cartesian coordinate system, to uniquely identify each emitter in the Cartesian coordinate system; wherein each emitter out of the two-dimensional array of emitters (110) is configured to send a beacon signal comprising its address for assisting the remote device to provide the feedback, with the plurality of emitters configured to send beacon signals according a Code-Division Multiple Access; and the controller (101) is configured to select an emitter out of the two-dimensional array of emitters (110) for establishing an optical wireless data link with the remote device according to the feedback received from the remote device.

A method for detection of an emitter mobile device (B) equipped with a light by a receiver mobile device (A) equipped with a camera, comprising: the emitter mobile device (B) emits a light-modulated signal to advertise its identity or state; the receiver mobile device (A) captures a series of frames with said camera;the modulated signal is detected from said frames; the pixel position of the emitter mobile device on a within the camera frame of the receiver mobile device is detected.

A method and system for tracking a location (Lc) of a surface treatment device (C) in a building (B). A set of local devices (Da,Db) is located in different rooms (Ra,Rb) of the building (B). Each local device comprises at least one of an optical detector (20) configured to receive an optical signal (O) from an optical beacon (10) arranged on the surface treatment device (C); and an optical beacon (10) configured to send an optical signal (O) to an optical detector (20) arranged on the surface treatment device (C). Each optical detector (20) is configured to transmit a signal (S) based on detecting that a respective optical signal (O) has been transceived between the surface treatment device (C) and a respective local device (Da) for indicating that the location (Lc) of the surface treatment device (C) corresponds to a respective room (Ra) corresponding to the respective local device (Da).

A laser measurement system including a laser transmitter and a laser receiver is provided. The laser transmitter includes a reflective surface and one or more laser sources for projecting an initial laser pulse. The laser receiver includes a first reflective surface for reflecting the initial laser pulse to provide a first reflected laser pulse, and a second reflective surface for reflecting the initial laser pulse to provide a second reflected laser pulse. The laser receiver also includes a photodetection unit for receiving: 1) a first double-reflected laser pulse generated by reflecting the first reflected laser pulse from the reflective surface of the laser transmitter, and 2) a second double-reflected laser pulse generated by reflecting the second reflected laser pulse from the reflective surface of the laser transmitter. The laser receiver determines an orientation angle associated with the laser receiver based on the first and second double-reflected laser pulses.

The invention discloses a positioning method based on combination of an active infrared beacon and a standard mark, and aims to improve the precision and reliability of autonomous landing of an unmanned aerial vehicle on a dynamic platform. According to the method, an active infrared beacon made of a 400-series stainless steel substrate and polymer materials (such as optical polypropylene (PP), polycarbonate (PC) and acrylic acid (PMMA)) with similar optical properties is adopted, the emission wave band is set within the range of 920-960 nm, and all-weather stable operation is ensured. A binocular stereo camera system is combined, each camera is provided with a global shutter high-resolution sensor and a special infrared filter precisely fixed through a 3D printing technology, the baseline of the left camera and the baseline of the right camera are about 24 cm, the highest system frame rate can reach 120 FPS, and the real-time output pose data frequency is not lower than 30 FPS. A preliminary pose is solved by performing preprocessing, ROI extraction, feature extraction, stereo matching and triangulation on an acquired image, iterative optimization is performed by using a dynamic weighted graph optimization algorithm based on a G2O framework, and finally high-precision pose data is output. The method has the advantages of high real-time performance, good robustness and low manufacturing cost, and is suitable for unmanned aerial vehicle positioning in a complex dynamic environment.

Head-mounted augmented reality (AR) devices can track pose of a wearer's head to provide a three-dimensional virtual representation of objects in the wearer's environment. An electromagnetic (EM) tracking system can track head or body pose. A handheld user input device can include an EM emitter that generates an EM field, and the head-mounted AR device can include an EM sensor that senses the EM field. EM information from the sensor can be analyzed to determine location and / or orientation of the sensor and thereby the wearer's pose. The EM emitter and sensor may utilize time division multiplexing (TDM) or dynamic frequency tuning to operate at multiple frequencies. Voltage gain control may be implemented in the transmitter, rather than the sensor, allowing smaller and lighter weight sensor designs. The EM sensor can implement noise cancellation to reduce the level of EM interference generated by nearby audio speakers.

To propose an improved system for position determination with an energy guide chain, which is robust in operation and can be installed at the place of use with least possible effort.SOLUTION: An energy chain has a movable run that is fixed at an end to a driver, and a stationary run, in which the driver 4 moves back and forth along a track. A system 20 has a sensor device for position determination, which is attached to the driver 4. The system 20 comprises guide components 28A, 28B that are arranged along the track, for lateral guidance of the energy chain 1, at least one of which components has a reference component 23A, 24 acting as a position reference.SELECTED DRAWING: Figure 2

A free-space optical transceiver comprises a wide field-of-view lens for receiving an incoming beam, and a sensing system comprising a photodetector for reading data from the incoming beam, a coarse tracking sensor configured to indicate a coarse degree of alignment with the incoming beam, and a fine tracking sensor configured to indicate a fine degree of alignment with the incoming beam. The coarse tracking sensor comprises a central aperture behind which the photodetector and the fine tracking sensor are situated such that the incoming beam is directed to the photodetector and the fine tracking sensor via the central aperture. The optical transceiver further comprises a coarse beam-steering device intermediate the wide field-of-view lens and the sensing system, the coarse beam-steering device being for coarsely aligning the incoming beam with the photodetector and a centre of the coarse tracking sensor based on the indicated coarse degree of alignment.

A method includes receiving, from at least two sources of information, information regarding a takeoff and landing area. The method also includes determining aircraft state information based on the information regarding the takeoff and landing area. The method additionally includes assigning one or more coefficients to the aircraft state information. The method further includes calculating one or more weighted aircraft state calculation values, where each of the one or more weighted aircraft state calculation values is associated with a coefficient of the one or more coefficients. The method also includes calculating an aircraft state of an aircraft that seeks to use the takeoff and landing area based on the one or more weighted aircraft state calculation values. The method further includes navigating the aircraft based on the calculated aircraft state of the aircraft.

To provide an inexpensive measuring system with high accuracy at the same time.SOLUTION: A base station 2 is configured for a wobbling motion of a planar beam 4, by the wobbling motion, a posture of a normal 6 of the planar beam 4 is changed in a known way such that orientations of the normal 6 occur repeatedly. The normal 6 of the planar beam 4 can cyclically repeat its posture. A measuring device 1 for the base station 2 of this type and at least one remote station 3 belonging to the base station, is also provided. A method for guiding a mobile object, in particular a vehicle, is provided. Here, the base station 2 and at least one active remote station 3 permanently associated with the mobile object are used. They form a transmitter, a receiver, and the measuring device together.SELECTED DRAWING: Figure 2

An apparatus (100) for tracking an object (200), the apparatus comprising means attached to the object (200), a wireless communication circuit (102), at least two antenna modules (104) having respective positions different from each other, and at least one processor (108), the at least one processor is configured to: select one of the at least two antenna modules (104) based on information indicative of an antenna module of the at least two antenna modules for a best orientation for wireless communication; -transmitting or receiving one or more signals for tracking said object (200) using the wireless communication circuit (102) and the selected optimal orientation antenna module (104).

A process for remote localization of an object including (i) receiving / determining two or more magnetic field measurements using at least one magnetometer of a magnetic field generated by a magnetic field source (MFS) in a marker apparatus remote from the magnetometer and in / on an opaque medium such that the magnetic field extends through the opaque medium and / or through a navigable medium between the MFS and the magnetometer; (ii) receiving / determining two or more respective measurement locations of the magnetic field measurements in 3D by determining locations of the magnetometer when the magnetic field measurements are / were determined; and (iii) numerically estimating a location of the MFS in 3D using the magnetic field measurements, the measurement locations, and a mathematical model representing the system as a magnetic dipole (the MFS) in the navigable and opaque media and the resulting magnetic fields. The measurements can be made while the magnetometer is moving.

This invention relates to the field of autonomous underwater vehicle (AUV) positioning, specifically based on the principle of cone projection. It addresses the problems of complex and time-consuming positioning processes in existing monocular vision-based target positioning methods. The invention utilizes acoustic signals detected by an acoustic guidance device to navigate to the recovery range of a positioning and recovery device. The AUV's bow is aligned with the cage opening of the device, and the central axes of both the AUV and the device are coplanar and parallel to the horizontal plane. Image information from a guide light source is then acquired, and the yaw angle of the AUV is calculated based on the principle of cone projection. This invention is primarily applied to the autonomous recovery of AUVs.