110results about "Direction finders using electromagnetic waves" patented technology

An optically based location system and method of determining a location at a structure include a lighting infrastructure having lights at a structure. Each light is configured to illuminate and to transmit a respective relative or absolute terrestrial position through modulation of emitted light. An optical receiver is configured to detect the lights, to demodulate the position of detected lights, and to determine from the detection a position of the receiver. The receiver can have a conventional optical detector for determining a two-dimensional position of the receiver relative to a detected light, or can have a three-dimensional spot collimating lens and charged couple device optical detector for determining a three-dimensional position of the receiver relative to a detected light. The receiver and lights can be synchronized for converting a delay time into a distance measurement to calculate a distance between a light and the receiver.

An object sensing apparatus for driver assistance systems in motor vehicles, including at least two sensor systems which measure data concerning the location and / or motion status of objects in the vicinity of the vehicle, and whose detection regions overlap one another, characterized by an error recognition device that checks the data measured by the sensor systems for absence of contradictions, and outputs an error signal upon detection of a contradiction.

Wireless communication terminals are disclosed that display the direction and distance between them so that users can, for example, travel away from each other and then later find one another. The terminals are configured to track their movement using acceleration data. Some of the terminals may operate as slave terminals in which they transmit their movement data to a master terminal which determines therefrom the relative direction and distance between the terminals. The master terminal may then transmit the relative direction and distance data to the slave terminals where it can be displayed to their users.

Photoelectric power generation system being able to follow sun autoamtically belongs to technical area of solar utilization. The system mainly composed of array of solar battery aid its mounting rack, mechanical transmission mechanism, tracking control circuit, sensor for sunlight orientation and resetting control equipment of wine proofing. The sensor for sunlight orientation includes condensinglens, sunlight signal receiver of fine and coarse adjustment. The sunlight signal receiver of fine adjustment includes light-sensitive surfaces in 4 orientations located on end face of base seat. Thesunlight signal receiver of coarse adjustment includes light-sensitive surfaces in 4 orientations located on perisporium of case. The condensing lens is fixed on top end of the case.

A direct beam solar lighting system for collecting and distributing sunlight into a room. The system includes a rotatable solar collector head to receive sunlight and to reflect the sunlight downward into a transition tube having a reflective interior surface. The light-concentrating transition tube reflects sunlight into a reflective light tube which directs the reflected sunlight through a plenum space into the room. The system includes a drive mechanism for rotating the rotatable solar collector, and a light fixture at end of the light tube to disburse said reflected sunlight onto a ceiling and a wall in the room. In an embodiment the system includes one or more homogenizing reflectors within the solar collector for collecting the sunlight and directing the sunlight more uniformly over the aperture of the transition tube. In an alternative embodiment, the solar collector includes a rotatable tiltable mirror for providing two-axis tracking.

The invention discloses a method and system for tracking a position of a matched gamepad of a VR (virtual reality) head-mounted device, the matched gamepad of the VR head-mounted device, the matched VR head-mounted device of the gamepad and a VR device. The method includes arranging an infrared light source on a gamepad shell, arranging a binocular infrared camera for shooting the infrared light source on the VR head-mounted device, and measuring spatial attitudes of the gamepad and the VR head-mounted device; computing a related position relation of the gamepad and the VR head-mounted device according to spatial attitude information of the gamepad, spatial attitude information of the VR head-mounted device and image information shot by the binocular infrared camera; determining the spatial position of the gamepad according to the spatial position of the VR head-mounted device and the related position relation of the gamepad and the VR head-mounted device.

The invention discloses a Zigbee networks visible light positioning wireless charging system and a method. The system includes a wireless charging device and a Zigbee network node; the wireless charging device and the Zigbee network node communicate with each other through a Zigbee protocol; the wireless charging device includes a wireless charging module and a light source detection module; and the Zigbee network node comprises a gateway node, a coordinator and a terminal node, wherein the coordinator is used for coordinating the communication between the gateway node and the terminal node. As for a situation that wireless charging does not require accurate positioning, the invention provides a simple and convenient visible light positioning scheme. The visible light positioning scheme has the advantages of high positioning efficiency and simple computation, and can greatly improve wireless charging efficiency.

The invention discloses a two-dimensional MUSIC (multiple signal classification) direction-detecting device for a uniform circular array, which comprises an FPGA (field programmable gate array) processing unit and a DSP (digital signal processor) processing unit, wherein the DSP processing unit is used for receiving a covariance matrix containing target azimuth information sent by the FPGA processing unit, utilizing a two-dimensional MUSIC algorithm to obtain the target azimuth information and sending the target azimuth information to the FPGA processing unit, and the FPGA processing unit is used for performing filtering noise-removing treatment on a signal received by an external antenna, and then calculating the covariance matrix containing the target azimuth information and storing the azimuth information calculated by DSP. According to the device, the two-dimensional MUSIC algorithm serves as a method for estimating the target azimuth, the calculating complexity in each step is reduced as much as possible, and the real-time direction-detecting capacity of the device is higher than that of the traditional device.

The present disclosure provides a method for operating a first electronic device. The method includes detecting a movement of the first electronic device, receiving direction information of a second electronic device, and determining an azimuth angle of a heading direction of the first electronic device based on the received direction information of the second electronic device.

In a first embodiment of the invention, there is provided a method for structuring digital video images in a computer system. The digital video images are capable of being displayed on a display device and contain addressable digital data that is addressable with respect to a reference point on the display device. The method may be embodied in computer code on a computer readable medium which is executed by a processor within the computer system. The computer code removes motion from a digital video image stream. By removing motion from the digital image stream, additional information and details can be observed which are spread out over multiple images when the images are displayed in sequence. The method begins by obtaining a first digital video image and a second digital video image. A subsection is defined within the first digital image at an addressable location relative to the reference point. A subsection of the second digital image is selected which has the same addressable location as the subsection from the first digital image. The subsection of the second digital video image is shifted in a predetermined direction. After the region is shifted, an error value is calculated based upon a comparison of the subsection of the first digital image and the shifted subsection of the second digital video image. If the error is below a predetermined threshold, the digital data of the second digital video image is readdressed such that the data of the newly defined subsection would overlay the subsection from the first digital video image if displayed on a display device.

A luminaire locating device may be used to automatically determine positions of luminaires of a lighting system. The luminaire locating device may have an interface to receive intensity information captured by a plurality of optical sensors. The luminaire locating device may have an electronic processing device to process the intensity information captured by the plurality of optical sensors to determine the positions of the luminaires.

A measuring device, in particular a handheld measuring device, for the localization of objects enclosed in a medium, including at least one photometric sensor that obtains by way of the at least one photometric sensor a first measurement signal of the object to be examined, so that by evaluation of that measurement signal, information about an object enclosed in the medium is obtained, and at least one further sensor, for generating at least one further second measurement signal for obtaining information about the object enclosed in the medium. A method for the localization, by way of a photometric sensor, of objects enclosed in a medium.

The invention relates to a method and system for discovering and tracking a remote controller of an illegally flying unmanned aerial vehicle. The system is composed of an unmanned aerial vehicle, a direction finding and positioning device, a flight control and communication module, a camera and cradle head and ground equipment, wherein the unmanned aerial vehicle is a lift-off platform of the whole system; the direction finding and positioning device performs direction finding and positioning on an unmanned aerial vehicle remote control signal; the flight control and communication module controls the whole illegally flying unmanned aerial vehicle system on the one hand, and is used for communicating with the ground equipment on the other hand; the camera and cradle head are used for searching and tracking an illegally flying unmanned aerial vehicle target; and the ground equipment is used for remotely controlling the unmanned aerial vehicle of the own side by a ground user and transmitting and receiving interactive information. The system has a searching state, a positioning state and a tracking state. The system lifts off, recognizes tracks and approaches the illegally flying unmanned aerial vehicle by using an unmanned aerial vehicle platform, and performs continuous direction finding and positioning on the ground remote control signal, thereby achieving a purpose of positioning and tracking the remote controller of the illegally flying unmanned aerial vehicle.

An observation supporting apparatus includes a position specifying section which specifies a coordinate point of a moving object detected in a viewing field through once observation. An orbit estimating section calculates an estimate orbit of the moving object in the viewing field based on the specified coordinate points. Data necessary to estimate the position of the moving object out of the viewing field is acquired using the estimate orbit by the orbit estimating section.

The invention relates to a method for estimating signal DOA (direction of arrival) under fewer snapshots and an impulsive noise background. The method comprises the following steps: collecting signal sampling data; performing impact removal pretreatment on the received signal data vector; re-sampling and building the covariance matrix of a matrix subjected to impact removal; decomposing the subspace of the re-sampled built covariance matrix, so as to obtain the noise subspace of the covariance matrix; respectively solving the covariance matrix re-sampled for B times, so as to obtain a vector matrix formed by B incident angle estimated values theta, and using a confidence space to correct the matrix and calculating the mean value (theta)i, so as to obtain the estimated value of final DOA angle (theta)i. According to the invention, the received data is preprocessed, so that the impulsive noise can be effectively suppressed; the block-bootstrap method is adopted to resample and build the data matrix, so that the signal can be effectively expanded under the fewer snapshots; the method is high in robustness and is suitable for the estimation of DOA under fewer snapshots and the impulsive noise background and a good direction measurement effect is achieved.

The invention provides a coprime matrix robust adaptive beamforming algorithm based on matrix filling. The coprime matrix robust adaptive beamforming algorithm based on matrix filling comprises the following steps that a sample covariance matrix of received data is calculated; the sample covariance matrix is vectorized to obtain vectors, and then elimination of redundancy and vector rearrangementare carried out on the vectors to obtain the received data vectors of a complete coprime matrix differential optimization matrix; zero is arranged between elements with discontinuous wave range difference in the received data vectors in a filling mode to obtain the vectors, and then the vectors are obtained by taking information of the positive half part of the vectors; the vectors are expanded into a Toplitz matrix; the Toplitz matrix is restored to obtain a filled covariance matrix; spectral peak search is carried out in an interference signal angle region to obtain estimation of arrival angles of each interference signal; the estimated arrival angles of interference signals, the physical array information of a coprime array and an interference and noise covariance matrix which reconstructs a coprime array physical array are utilized; weighted vectors of an adaptive beamformer is calculated by using the estimation of the interference and noise covariance matrix and expected signal steering vectors.

The invention discloses a spatial directional angle measuring system based on all-optical cross polarization modulation. The spatial directional angle measuring system comprises a first mach-zehnder intensity modulator, a polarization controller, a second mach-zehnder intensity modulator, a polarization controller I, an electric coupler, a microwave phase shifter, a polarization controller II, an optical fiber online polarizer, an optical band pass filter, a photoelectric detector, an offset T and a voltmeter, wherein the first mach-zehnder intensity modulator and the polarization controller are connected with a first laser light source; the second mach-zehnder intensity modulator and the polarization controller I are connected with a second laser light source; the electric coupler and the microwave phase shifter are connected with a microwave signal source; the polarization controller III, the optical fiber online polarizer, the optical band pass filter, the photoelectric detector, the offset T and the voltmeter are sequentially connected with the optical coupler. The spatial directional angle measuring system based on all-optical cross polarization modulation can be used for solving the problem of difficulty in quickly identifying antenna signal directional position information in an optically controlled phased array radar, and can be used for realizing primary measurement of an antenna spatial directional angle based on an all-optical cross polarization modulation method.

A cryogenic cooling system (12) for cooling electromagnetic energy detectors (50). The cooling system (12) includes a first mechanism (18) that accommodates cryogen fluid in one or more spaces (58, 60). A second mechanism (16, 42) freezes the cryogen fluid in the one or more spaces (58, 60) adjacent to the electromagnetic energy detectors (50). In a specific embodiment, the electromagnetic energy detectors (50) comprise an infrared focal plane array (50). The second mechanism (16, 42) includes a heat exchanger (16) that is mounted separately from the first mechanism (18). The one or more spaces (58, 60) are fitted with three-dimensional cooling interface surfaces (62, 64). The three-dimensional cooling surfaces (62, 64) are implemented via a thermally conductive matrix (62, 64). The thermally conductive matrix (62, 64) is a copper metal matrix or carbon / graphite matrix, and the solid cryogen reservoir (18) is a beryllium reservoir (18). The solid cryogen reservoir (18) includes integrated mounting features (52, 54) for mounting the reservoir (18) to a missile housing and a surface for attaching the focal plane array (50) to the reservoir (18). The second mechanism (16, 42) includes a Joule-Thomson orifice (42) that employs the Joule-Thomson effect to cool the cryogen fluid to a solid state. The first mechanism (18) includes a selectively detachable cryogen canister that provides pressurized cryogen fluid to the heat exchanger (16). The heat exchanger (16) directs cooled pressurized cryogen fluid to the solid cryogen reservoir (18) and Joule-Thomson orifice (42) and is positioned remotely from the cryogen reservoir (18). In an illustrative embodiment, the heat exchanger (16) outputs cooled cryogen gas to plural solid cryogen reservoirs (18) to cool plural corresponding infrared focal plane arrays (50). A line cutter selectively detaches the gas canister and / or the heat exchanger (16) from the missile in response control signal from a computer. The computer generates the control signal after a predetermined amount of the cryogen fluid is present in the cryogen reservoir (18) or after a predetermined time interval.

Provided are methods and systems for identifying location of light sources from airborne aircraft. Light sources are ground based and may be low power lasers and other like devices. An aircraft equipped with a detecting module, such as a camera of a ground maneuver camera system, may defect light source output and associate this output with the relative position of the aircraft to the light source. This information may be analyzed together with aircraft location information (at the time of light source detection) to generate a light source location estimate. In some embodiments, other information, such as transmission from other aircraft and / or ground based nodes can be used. The estimate may be transmitted to a ground based node, such as a law enforcement unit. The data from multiple aircraft and / or ground based nodes may be aggregated to more precisely identify the light source location.

The invention is directed to an ultrasonic testing system. The system tests a manufactured part for various physical attributes, including specific flaws, defects, or composition of materials. The part can be housed in a gantry system that holds the part stable. An energy generator illuminates the part within energy and the part emanates energy from that illumination. Based on the emanations from the part, the system can determined precisely where the part is in free space. The energy illumination device and the receptor have a predetermined relationship in free space. This means the location of the illumination mechanism and the reception mechanism is known. Additionally, the coordinates of the actual testing device also have a predetermined relationship to the illumination device, the reception device, or both. Thus, when one fixes the points in free space where the part is relative to either of the illumination device or the reception device, one can fix the point and / or orientation of the testing device to that part as well. It should be noted that the results of the point and / or orientation detection may also be used in an actuator and control system. If the position of the testing device needs to be altered with respect to the tested object, the control system and actuator may use the results of this determination to move the testing device relative to the tested object.

The invention discloses a compressed sensing theory-based four-dimensional antenna array DOA estimation method. According to the method, a sparse signal model for four-dimensional antenna array DOA estimation is established to find that time sequences have important influences on sparse signal recovery, and an improper time sequence is possible to change time modulated noise into color noise so asto seriously worsen the sparse signal recover ability. Therefore, matrix dependency and a noise covariance matrix are introduced to quantitatively analyze the influences, on sparse signal recovery and noises, of different time sequences; and on such basis, a differential evolution algorithm is utilized to establish a time sequence-oriented optimization model. An I1 norm singular value decomposition-based sparse signal recovery algorithm applied to traditional arrays is extended into four-dimensional antenna arrays and the optimized time sequences are combined to carry out four-dimensional antenna array DOA estimation. Numerical simulation results prove that the method has large advantages in the aspects of resolution characteristic and accuracy characteristic when being compared with other four-dimensional array DOA estimation methods, particularly under the conditions of low signal to noise ratio and small snapshot number.

The disclosure provides an example of a system including a radio frequency (RF) wireless communication network (network) including a plurality of nodes in an area and a computer coupled to the network. Each of the nodes includes a transmitter and a receiver. At plurality of times, each transmitter transmits RF spectrum signals (signals) and each receiver receives the signals and also generates an indicator data of a signal characteristic of the received signal propagated in the network. When each time among the plurality of times is a current time, the computer obtains the indicator data of the signal, determines a modification in the indicator data at the current time from the indicator data at a preceding time due to a movement of an occupant in the area and detect an occupancy condition in the area based on the modification in the indicator data and a parameter of a configuration of the network.

A system and method for tracking an object receive electronic intelligence (ELINT) track information related to the object and radar track information. A first likelihood that the radar track information is also related to the object is determined at a first time of the ELINT track information and a first time of the radar track information. A second likelihood that the radar track information is also related to the object is determined at a second time of the ELINT track information and a second time of the radar track information. The first likelihood and the second likelihood are processed to determine whether the ELINT track information and the radar track information should be associated as both being related to the object.

The invention discloses a light source direction positioning device, which comprises a spherical main body, a control unit and a plurality of photosensitive sensors, wherein a plurality of grooves areformed in the surface of the spherical main body; each photosensitive sensor is arranged in each of the grooves; the control unit is disposed inside the spherical main body; the control unit is electrically connected with the plurality of photosensitive sensors; the photosensitive sensors are configured to detect a light signal emitted by an external light source, generate a detection signal, andthen send the detection signal to the control unit; and the control unit is configured to acquire a light intensity value detected by each photosensitive sensor according to the detection signal, anddetermine a light source direction of the external light source according to a magnitude of the light intensity value. According to the light source direction positioning device, by the arrangement of the photosensitive sensors on the surface of the spherical main body and then positioning of the direction of illumination of the light source by using the light intensity value detected by the photosensitive sensors, the direction of illumination of the light source in each direction can be positioned.

According to the arrangement invented the deflection of a blade of a wind turbine is determined. A transmitter is arranged close to the tip end of the blade, while a receiver is arranged close to the root end of the blade. The transmitter and the receiver are prepared for a wireless transfer of a monitoring signal, which is sent from the transmitter to the receiver. A monitoring system is arranged close to the root end of the blade. The monitoring system is prepared to generate the monitoring signal. The monitoring system is connected with the transmitter by a cable-bound communication line, thus the monitoring signal is transferred from the monitoring system to the transmitter. The monitoring system is even connected with the receiver, thus the monitoring signal is transferred from the receiver to the monitoring system. The monitoring system is prepared to determine the deflection of the blade based on the transferred monitoring signal.