29results about "Direction finders using electromagnetic waves" patented technology

Augmented reality apparatus and methods of use are provided with secure persistent digital content linked to three-dimensional location coordinates. More specifically, the present method links a physical location with digital content to enable a user interface with augmented reality that combines aspects of the physical area with a three-dimensional location specific digital content. According to the present method, digital content remains persistent with a location even if visual aspects of the location change.

Augmented reality apparatus and methods of use are provided with secure persistent digital content linked to a location coordinates. More specifically, the present invention links a physical location with digital content to enable a user interface with augmented reality that combines aspects of the physical area with location specific digital content. According to the present invention, digital content remains persistent with a location even if visual aspects of the location change.

The present invention discloses a method for estimating the direction of arrival of a coherent signal, belonging to the field of ship radar and communication signal processing. The method comprises: a transmitting end sends a pilot signal of a target power to a receiving end, and the receiving end obtains the multipath delay structure of the channel based on the pilot signal; the transmitting end sends a normal pilot signal to the receiving end, and calculates the cross-correlation function between the received signal and the transmitted signal; the peak values ​​of the cross-correlation function are sorted in descending order to determine the candidate possibilities of the first delay, and the cross-correlation function after the composite path is calculated to determine the shortest delay; a cost function for the delay is constructed, and the cost function is differentiated with respect to two independent variables to obtain an estimated value of the arrival time difference; the direction of arrival is calculated from the estimated value of the arrival time difference, completing the one-dimensional direction of arrival estimation of the coherent signal applied to a uniform linear array. This method can improve the detection accuracy of passive radar and sonar equipment for targets and enhance the comprehensive detection capability of surface ships.

The application is a lightning positioning optimization method and system and a medium for correcting the influence of terrain and geological parameters on lightning electromagnetic wave propagation. The method grids the area around the lightning detection station involved in lightning positioning. Using the ground and ionosphere electromagnetic wave propagation model, the time delay correction value and parameter correction coefficient of lightning electromagnetic wave propagation from the preliminary lightning position to the lightning detection station are calculated without considering terrain and geological parameters and considering terrain and geological parameters. When the closest grid point is found as the lightning point in the time delay correction table and parameter correction coefficient table corresponding to the lightning detection station involved in positioning, the time delay correction value and parameter correction coefficient corresponding to each lightning detection station are used to correct the lightning detection station, and the corrected waveform arrival time and corrected characteristic parameters corresponding to each lightning detection station are obtained. The accurate lightning position and accurate lightning characteristic parameters are calculated.

The application provides a method and system for obtaining radar antenna beam pointing information by laser ranging, comprising: a satellite is equipped with a radar antenna, a star sensor, a measuring antenna and a measuring system; when in orbit, all transmitting channels of the radar antenna transmit microwaves to the measuring antenna one by one and are received by the measuring antenna one by one, at the same time, the measuring antenna is continuously measured by the measuring system, the position of the measuring antenna is transformed into the observation coordinate system of the star sensor according to the fixed position relationship between the laser vibration measuring device and the star sensor in the measuring system and the fixed spatial angle relationship between the laser pointing and the optical axis pointing; during the process of fitting the radar antenna beam pointing by using the measuring antenna to receive the microwaves of all transmitting channels of the radar antenna, the above position change of the measuring antenna is introduced into the fitting process, the fitting deviation of the radar antenna beam pointing caused by the position change of the measuring antenna is equivalently eliminated, and the in-orbit beam pointing information of the radar antenna in the observation coordinate system of the star sensor is obtained.

The invention discloses a single Rydberg atom receiver multi-target direction of arrival estimation method based on spatial resolution fluorescence spectrum analysis. According to the method, a modulation pattern formed by interference of a plurality of radio frequency signals and a local oscillation field in the steam chamber is obtained through spatial resolution fluorescence imaging, traditional lumped power measurement is replaced, and therefore multi-target spatial information is completely reserved. On the basis, complex spatial modulation caused by a plurality of signals is linearized into superposition of sine waves with different spatial frequencies by utilizing a strong local oscillation condition, so that a multi-target direction-of-arrival estimation problem is converted into a classical frequency spectrum estimation problem. And finally, through spectrum analysis, extracting each spatial frequency and calculating a corresponding direction of arrival. According to the method, through the core steps of spatial resolution imaging, linear modeling and spectral analysis, the limitation that a single Rydberg atom receiver can only estimate a single target is fundamentally broken through, and simultaneous estimation of the directions of arrival of a plurality of signal sources by using a single receiver is realized.

Method for characterizing the movement of an object, associated calculator, system and carrier The present invention relates to a method for characterizing the movement of an object comprising the steps of: - obtaining measurements of two angular orientations of the object relative to a sensor, - applying an estimator to each pair of measured orientations, the estimator assuming a movement for the object, to obtain estimated state vectors - determining a respective set of possible values ​​for the coordinates of each state vector by applying a constraint to the estimated state vectors, a constraint being a constraint according to which the movement of the object is the movement assumed by the estimator, and - detecting the nature of the movement of the object, the detected movement being the assumed movement when each estimated state vector belongs to the set determined for the considered estimated state vector,the detected movement being different from the supposed movement otherwise. Figure for the abstract: figure 3,

A missile warning system comprises: a primary sensor (110) for detecting a potential missile (50) in a first spectral range; a secondary sensor (120) for detecting the potential missile (50) in a second spectral range; and an evaluation unit (130). The evaluation unit (130) is configured: to receive first detection signals (115) from the primary sensor (110) and compare them with a threshold value (S1), and, if the threshold value (S1) is exceeded, to generate a warning signal for the potential missile (50); to continuously receive second detection signals (125) from the secondary sensor (120) and store them for a predetermined period; and, if the warning signal is present, to perform a verification of the potential missile (50) based on a traceback, wherein the traceback includes an analysis of the stored sensor signals of the secondary sensor (120).

Method for characterizing the motion of an object, computer, system and associated carrier. The present invention relates to a method for characterizing the motion of an object comprising the steps of: - obtaining measurements of two angular orientations of the object with respect to a sensor, - applying an estimator to each pair of measured orientations, the estimator assuming motion for the object, to obtain estimated state vectors, - determining a set of possible values ​​for the coordinates of each state vector by applying a constraint to the estimated state vectors, a constraint being a constraint according to which the motion of the object is the motion assumed by the estimator, and - detecting the nature of the motion of the object, the detected motion being the motion assumed when each estimated state vector belongs to the set determined for the considered estimated state vector.The detected movement being different from the movement that would otherwise be assumed. Figure for the abbreviation: figure 3.

This invention relates to the field of radio frequency signal measurement technology, and proposes a microwave photonic system and method for nanosecond-level measurement of frequency and angle of arrival. The system includes: an optical frequency comb generation module, in which a narrow-linewidth laser generated by a tunable laser is amplified by an erbium-doped fiber amplifier and then excited by the Kerr nonlinear effect to generate a coherent optical frequency comb; an antenna receiving module, which receives a first radio frequency signal and a second radio frequency signal; an electro-optic modulation module, in which the first radio frequency signal and the second radio frequency signal are respectively input to a first sub-modulator and a second sub-modulator, and a third sub-modulator is used to combine the first and second modulated lights and introduce a preset phase difference to obtain a target optical pulse signal; and a frequency-time mapping and detection module, in which the target optical pulse signal is frequency-time mapped via a dispersive fiber, a photodetector converts the mapped optical signal into an electrical pulse train, and an oscilloscope is used to observe the time interval between adjacent peaks and the pulse amplitude information of the electrical pulse train to obtain the characteristic parameters of the radio frequency signal.

The present application provides a chip-type optical direction-finding and positioning device, comprising a spatial spectrum acquisition module, a driving module, a photocurrent processing module, and a direction-finding calculation module; the spatial spectrum acquisition module comprises a plurality of interference baseline units for acquiring the spatial spectrum of a target light source; the driving module provides a phase-modulated current so that each interference baseline unit achieves constructive and destructive interference under two external phase difference conditions of 0 and π / 2; the photocurrent processing module amplifies and measures the photocurrent to obtain the corresponding photocurrent intensity; the direction-finding calculation module calculates the intensity and phase information of the spatial spectrum points based on the photocurrent intensities corresponding to the constructive and destructive interference under the two external phase difference conditions of 0 and π / 2; an inverse Fourier transform is performed to complete the reconstruction of the target light source image, and the direction of the target light source is determined with the center of the reconstructed image as the direction-finding origin, thereby achieving high-resolution light source image reconstruction, thereby accurately measuring the relative direction of the light source, and improving the accuracy of light source direction-finding.

An intraocular micro-display (IOMD) system includes an auxiliary head unit. The auxiliary head unit includes a frame for mounting to a head of a user, a scene camera module mounted in or on the frame in a forward-facing orientation, a gaze tracking module disposed in or on the frame and configured to monitor an eye of the user, and an auxiliary controller. The auxiliary controller includes for: acquiring a scene image with the scene camera module, determining a gazing direction of the eye based upon gaze direction data from the gaze tracking module, identifying a sub-portion of the scene image based upon the gazing direction, and wirelessly relaying the sub-portion of the scene image to an IOMD implant within the eye for displaying to a retina of the eye.

A method for providing a differential code bias, in particular a primary differential code bias and a secondary differential code bias, in a global navigation satellite system using satellites communicating by using at least a first signal and an additional first signal both having a first carrier frequency and a second signal and an additional second signal both having a second carrier frequency, where a primary differential code bias for the first signal and the second signal is determined and wherein the primary differential code bias is used for determining, and in particular providing, a secondary differential code bias for the additional first signal and the additional second signal.

An intraocular micro-display (IOMD) system includes an auxiliary head unit. The auxiliary head unit includes a frame for mounting to a head of a user, a scene camera module mounted in or on the frame in a forward-facing orientation, a gaze tracking module disposed in or on the frame and configured to monitor an eye of the user, and an auxiliary controller. The auxiliary controller includes for: acquiring a scene image with the scene camera module, determining a gazing direction of the eye based upon gaze direction data from the gaze tracking module, identifying a sub-portion of the scene image based upon the gazing direction, and wirelessly relaying the sub-portion of the scene image to an IOMD implant within the eye for displaying to a retina of the eye.

The present invention relates to a high-resolution foldable water depth scanning device for measuring the flow velocity profile of a pool, which comprises a plurality of instrument mounting rods that can be folded in sequence, and each pair of instrument mounting rods is connected by a hinge; a current meter is fixed on each instrument mounting rod by two upper and lower clamps through screws, and dimension scale lines for adjusting the mounting position of the current meter are engraved on each instrument mounting rod; the first instrument mounting rod at the bottom is of a telescopic nested tube structure, the outer tube and the inner tube cannot fall off from each other, and the outer tube slides along the inner tube. A base is welded to the lower end of the inner tube, and a laser is fixed on the base for determining the installation orientation of the device; the base is fixed to the bottom of the pool. After the whole device is arranged in the pool, by moving the top instrument mounting rod up and down to drive the outer tube of the first instrument mounting rod at the bottom to slide, high-resolution adjustment of the water depth measured by the current meter can be achieved.

According to the MSCKF visual odometer method based on the course constraint, the problem that the estimation precision is reduced due to inconsistent course observability is solved through course constraint information, the system robustness is improved, and the MSCKF visual odometer method based on the course constraint has wide application prospects in multiple fields in the future. The problem that the estimation precision is reduced due to inconsistent course observability is solved, and the robustness of long-time operation of the MSCKF system is enhanced.

A method for providing a differential code bias (DCB), in particular a primary differential code bias (DCB1) and a secondary differential code bias (DCB2), in a global navigation satellite system using satellites (2) communicating by using at least • - a first signal (41) and an additional first signal (41') both having a first carrier frequency (C1) and • - a second signal (42) and an additional second signal (42 ') both having a second carrier frequency (C2); wherein a primary differential code bias (DCB1) for the first signal (41) and the second signal (42) is determined and wherein the primary differential code bias (DCB1) is used for determining, and in particular providing, a secondary differential code (DCB2) bias for the additional first signal (41') and the additional second signal (421).

An intraocular micro-display (IOMD) system includes an auxiliary head unit. The auxiliary head unit includes a frame for mounting to a head of a user, a scene camera module mounted in or on the frame in a forward-facing orientation, a gaze tracking module disposed in or on the frame and configured to monitor an eye of the user, and an auxiliary controller. The auxiliary controller includes for: acquiring a scene image with the scene camera module, determining a gazing direction of the eye based upon gaze direction data from the gaze tracking module, identifying a sub-portion of the scene image based upon the gazing direction, and wirelessly relaying the sub-portion of the scene image to an IOMD implant within the eye for displaying to a retina of the eye.

The utility model discloses a cable path identification signal receiver, which relates to the technical field of receivers and comprises a display controller and a body. A central processing unit is arranged inside the display control instrument, a liquid crystal display screen and keys are arranged outside the display control instrument, and the liquid crystal display screen and the keys are electrically connected with the central processing unit; the first horizontal antenna, the second horizontal antenna, the first vertical antenna, the second vertical antenna and the compass antenna are connected with different connecting ports of the machine body, and the connecting ports are electrically connected with the central processing unit; the position and the direction of an underground cable are judged by receiving signals through the antenna, the position of a pipeline below the receiver is displayed through the liquid crystal display screen, the pipeline can be rapidly tracked, the telescopic handle is connected to the end of the machine body, and the height is adjusted according to stretching of the telescopic handle during detection so that the device can adapt to the height of a tester. And a tester does not need to bend down to carry the receiver by hand for a long time, so that the labor intensity of workers is reduced.

The invention relates to a position detection system, having at least one position detection device (1) and at least one light source device (20 to 2N), which differs from the position detection device (1). Every light source device (20 to 20N) is designed to generate a light point at a distance from the at least one position detection device (1). The at least one position detection device (1) comprises at least two line scan image sensors (11, 11'), wherein directions of extent of sensor surfaces (12, 12') of the two line scan image sensors (11, 11') together enclose an angle greater than 0° and preferably 90°. Above each line scan image sensor (11, 11'), a slot aperture (13, 13') is provided such that the slot aperture (13, 13') and the associated sensor surface (12, 12') enclose an angle greater than 0° and preferably 90°. The at least one position detection device (1) and the at least one light source device (20 to 2N) each have interfaces for wireless communication via which the at least one position detection device (1) and the at least one light source device (20 to 2N) are temporally synchronised in order to enable the position of a light point generated by a respective light source device (20 to 2N) to be detected by a time-multiplex method during the emission of light by the at least one light source device (20 to 2N).

The application discloses a kind of robust DOA estimation methods based on sparse bayesian learning, belong to array signal processing field, the method of this application first introduces position error parameter, and determines the prior distribution of grid error and element position error, secondly with the aid of sparse bayesian learning model, establish joint probability density distribution function, finally with the aid of maximum expectation algorithm to each unknown parameter is iterated, obtains spatial spectrum diagram, estimates the direction of incident signal.This application method can better azimuth estimation accuracy and azimuth resolution, still have good performance under the condition of less snapshot, low signal-to-noise ratio, and the application method has good robustness to the array system that exists element position error, has greater engineering application value.

Method for determining the positioning of a device (10) worn by a vehicle occupant, in particular data glasses (11), in a vehicle interior (12), wherein light emitted by at least one light source (13) arranged in the vehicle interior (12) is modulated by a control device (14) with a predetermined frequency not perceptible to the vehicle occupant, recordings of at least one area of ​​the vehicle interior (12) are made by means of a camera (15) of the wearable device (10) and received by an evaluation unit (16, 16'), and the frequency of the modulated light is determined by the evaluation unit (16,16') is recognized in several of the recordings and assigned to the light source (13) and the positioning of the portable device (10) in the vehicle interior (12) is determined based on a previously known spatial position of the light source (13) in the vehicle interior (12) and a position of the modulated light assigned to the light source (13) in the recordings; such system (20), vehicle (30) and portable device (10).,

The invention discloses an angle-measurement-only multi-sensor multi-target tracking method based on joint probability data association, solves the problem that the multi-target tracking precision of an angle-measurement-only multi-sensor system is reduced when targets are dense or mutually shielded, and belongs to the technical field of multi-target tracking. According to the method, the condition of merging measurement is described by establishing the merged graph model, and the probability of the merged graph is calculated. Then, the measurement merging situation is included into the association hypothesis, so that the association hypothesis is more complete; then, the probability of the joint association event is calculated, and the probability comprises the probability of the combined graph; and fusing the probability of each joint association event to obtain the association probability of the sensor measurement value and the target. And finally, according to the association probability of the measured value of the sensor and the target, weighting and updating the state of each target to realize multi-target tracking.

The present invention relates to a method for characterising the movement of an object, comprising the steps of: - obtaining measurements of two angular orientations of the object with respect to a sensor, - applying an estimator to each pair of measured orientations, the estimator assuming a movement of the object, with a view to obtaining estimated state vectors - determining a respective set of possible values for the coordinates of each state vector by applying a constraint to the estimated state vectors, a constraint being a constraint according to which the movement of the object is the movement assumed by the estimator, and - detecting the nature of the movement of the object, the detected movement being the movement assumed when each estimated state vector belongs to the set determined for the estimated state vector in question, the detected movement being different from the assumed movement otherwise.

A device (800) for protecting an aircraft against missiles, includes a Short-Wave InfraRed based (SWIR-based) Missile Tracking Unit, having a SWIR-based optical imager that associated with an optical SWIR band filter. The device (800) further includes a SWIR signals processor; it analyzes the captured SWIR optical signals; and it performs a SWIR-based missile acquisition process, which is also based on raw angular position data of a missile as received from a Missile Approach Warning System (MAWS); and it performs a SWIR-based missile tracking process, which continuously and dynamically determines a precise angular position of the missile based on the captured SWIR optical signals. The device (800) includes a laser-based missile-jamming unit, having an internal laser emitter; and optionally also being operably associated with an external high-power laser emitter; to disrupt the missile, or to disrupt a guiding station of the missile.

An object locating system includes a first wireless device associated with a light emitting device (LED), a second wireless device associated with an object, and a controller configured to perform operations. The operations include receiving an object identifier, determining a position of the LED based on a first signal associated with the first wireless device, determining a location of the object based on a second signal associated with the second wireless device, calculating an orientation offset and a distance to the object with respect to the position of the LED, determining whether the second wireless device is visible to the LED based on the second signal, determining a first angle and a second angle based on the orientation offset and the distance to the object and controlling one or more alignment devices based on the first angle and the second angle to align the LED with the object.

A laser detector apparatus (1) is provided, where a pixel array (3) is arranged behind a lens arrangement (4) such that distant objects (9) (in general, those at infinity) are out of focus at the pixel array. The image from the pixel array is evaluated by a computer processor (6) to detect such out of focus images which will be of a known size and shape (generally circular spots of known width). This can enable distant laser threats to be readily distinguished from nearby bright objects (10), whilst also protecting the pixel array from powerful laser sources (because the laser energy is not focussed to a point, on the pixel array it is less likely to damage the pixel array). It can also enable the wavelength of the laser to be accurately determined from the ratio of colours in the image of the laser spot, because it will typically not be a saturated image. The apparatus and method are particularly suitable for identifying and distinguishing laser sources across a wide range of brightnesses, and is also suitable for detecting and distinguishing multiple laser sources.

Various embodiments of the present invention may comprise a biometric sensor (220), an IR sensor (225), a communication module (240), a memory (245) storing instructions, and a processor (230). The instructions, when executed by the processor, may cause the wearable device to: acquire first sensing data from the IR sensor as the wearable device is worn on a user's finger; determine the wearing direction of the wearable device on the basis of the acquired first sensing data; guide the wearing direction of the wearable device according to the result of the determination; and redetermine the wearing direction of the wearable device on the basis of second sensing data acquired from the IR sensor after guiding the wearing direction. Various embodiments are possible.