Abstract: To provide a technique with which a FLAIR image and a T1-weighted image can be acquired in a short scan time, a magnetic resonance imaging apparatus comprises: an RF driver unit 121 for driving an RF coil unit 103; a gradient coil driver unit 122 for driving a gradient coil unit 102; and a controller unit 124 connected to the RF coil driver unit 121 and gradient coil driver unit 122, for controlling them so that an imaging sequence ISc having a duration of 1TR for generating echoes from a body part being imaged is repetitively executed, where the imaging sequence ISc has a first sequence part SQ1 including an inversion pulse 11 and an FSE sequence 12, and a second sequence part SQ2 including an inversion pulse 21 and a GRE sequence 22.

Abstract: Embodiments are disclosed for localization of vehicles using beacons. In an embodiment, a method comprises: determining, using at least one processor of a vehicle, that the vehicle has lost external signals (or is receiving degraded external signals) that are used for estimating a position of the vehicle; determining, using the at least one processor, a set of mobile beacons that are available to assist in estimating the position of the vehicle; receiving, using a communication device of the vehicle, broadcast signals from the set of mobile beacons, the broadcast signals including localization data for the set of mobile beacons; selecting, using the at least one processor, a subset of localization data from the set of mobile beacons for assisting in the position estimation of the vehicle; and estimating, using the at least one processor, the position of the vehicle using the subset of localization data.

Abstract: Systems and methods for determining a location of a mobile computing device requesting emergency services are provided. A mobile computing device may receive an indication of a request for emergency services from a user of the mobile computing device. The mobile computing device may receive a first wireless signal from a first device. The wireless signal may include an indication of a first geographic position associated with the first device. The mobile computing device may determine a location associated with the mobile computing device based on the indication of the first geographic position associated with the first device, and may send the determined location to a provider of emergency services.

Abstract: A detection device includes at least one detection module communicatively coupled with a communication device. The detection module includes a controller circuit communicatively coupled with a first antenna. The first antenna receives first electromagnetic signals from a first plurality of antennae located within an interior of a first vehicle. The first antenna receives second electromagnetic signals from a second plurality of antennae located and within an interior of a second vehicle. The controller circuit determines a position of the communication device within the interior of the first vehicle relative to locations of the first plurality of antennae based on the first electromagnetic signals received by the first antenna. The controller circuit determines a position of the communication device within the interior of the second vehicle relative to locations of the second plurality of antennae based on the second electromagnetic signals received by the first antenna.

Abstract: The present invention relates to a method for obtaining a location using Neighbor Awareness Networking, NAN, and a corresponding system as well as a method carried out by a NAN device and a corresponding NAN device so that a location can be obtained in a simple way. In particular, the method for obtaining a location using neighbor awareness networking, NAN, comprises requesting the location of a target NAN device; determining a cluster of wireless NAN devices comprising the target NAN device as well as one or more anchor NAN devices having predetermined locations to serve as positioning nodes; performing range measurements using the travel times of radio signals between the target NAN device and each of the one or more anchor NAN devices; and obtaining the location of the target NAN device based on the range measurements.

Abstract: A system and process determine the 3-dimensional position, the course line and possibly the speed of an energy source. Embodiments use an antenna array system that includes receiver transducers positioned to form an equilateral triangle with a receiver transducer at each point of the triangle. Each transducer is independent, and there may be no electrical connection between each transducer in the antenna array. Each transducer may be connected directly to a computer for signal analysis to provide for case decision and display of the appropriate information and steps to follow to determine the appropriate action required by the computer operator. By detection of a single signal from a sound or light source, the 3-dimensional position and a course line of that signal source can be determined under certain circumstances.

Abstract: A system for distributed dual-function radar-communication comprises a plurality of dual-function radar transmitters positioned within a region of interest, each configured to transmit at least one radar waveform, with each transmitter for having a minimum transmit power, a maximum transmit power, and a working transmit power, a plurality of radar receivers positioned within the region of interest, each configured to receive the radar waveforms, at least one controller communicatively connected to at least one connected transmitter of the plurality of dual-function radar transmitters, configured to calculate a vector of transmit power values for the plurality of dual-function radar transmitters. A method of transmitting a radar waveform is also disclosed.

Abstract: For example, an apparatus may include a Printed Circuit Board (PCB); a Multiple-Input-Multiple-Output (MIMO) radar antenna on the PCB, the MIMO radar antenna comprising a plurality of Transmit (Tx) antenna elements configured to transmit Tx radar signals, and a plurality of receive (Rx) antenna elements configured to receive Rx radar signals based on the Tx radar signals; and a surface wave mitigator connected to the PCB, the surface wave mitigator configured to mitigate an impact of surface waves via the PCB on a radiation pattern of the MIMO radar antenna.

Abstract: An analysis of radar signals, in particular of radar signals, which are received by a plurality of ULA antennas. By applying different beam formations to the radar signals of the individual ULA antennas, beamforming is used to compensate for dips in the gain.

Abstract: Techniques and apparatuses are described that enable full-duplex operation for radar sensing using a wireless communication chipset. A controller initializes or controls connections between one or more transceivers and antennas in the wireless communication chipset. This enables the wireless communication chipset to be used as a continuous-wave radar or a pulse-Doppler radar. By utilizing these techniques, the wireless communication chipset can be re-purposed or used for wireless communication or radar sensing.

Abstract: In one aspect, a system for obtaining dielectric properties of an object is disclosed, which comprises a plurality of transceivers for generating radiation in the microwave or millimeter-wave region of the electromagnetic spectrum. The transceivers are positioned in spatially fixed relationships relative to one another. The system further includes a controller for selectively activating the transceivers for irradiating at least a portion of the object and detecting at least a portion of the radiation reflected from said portion of the object in response to the irradiation, where each of the activated transceivers generates a signal in response to detection of the reflected radiation. The reflected signals are analyzed to determine a plurality of reflectivity coefficients corresponding to different discrete locations of the object, and the reflectivity coefficients are used to determine the complex permittivity of the discrete locations.

Abstract: The present disclosure relates to a vehicle radar, a vehicle radar controlling method, and a vehicle radar controlling system. Specifically, the vehicle radar includes a signal transmitter which transmits a transmission signal for detecting a target object, a signal receiver which receives a reception signal including a target signal generated by the transmission signal being reflected by the target object, and a signal processor which processes the reception signal to form a frequency spectrum of the reception signal. Specifically, the signal processor determines a window size based on the frequency spectrum of the reception signal, determines spectrum similarity between an up-chirp frequency and a down-chirp frequency based on the determined window size, and determines a length of the target object if the spectrum similarity is greater than a preset threshold value.

Abstract: A light detection and ranging (LiDAR) apparatus and a method of operating the LiDAR apparatus are provided. The LiDAR apparatus includes a light transmitter configured to irradiate a laser pulse towards an object, the laser pulse being generated based on a reference signal; a light receiver configured to receive the laser pulse reflected from the object and configured to obtain a first signal from the received laser pulse; and at least one processor configured to convert the first signal and the reference signal respectively into unipolar signals and configured to detect a flight time of the laser pulse based on a correlation between the converted first signal and the converted reference signal.

Abstract: Aspects of the disclosure provide a system and method used for time-of-flight lidar applications. Such systems and methods include a laser and pulse clipper which produces a shuttering effect to reduce the instantaneous output power from the pulse clipper. Accordingly the output from the pulse clipper is more suitable for time-of-flight lidar applications than that initially produced by the laser. This can allow for lasers which may otherwise exceed eye safety limits to be used for time-of-flight lidar applications without exceeding the eye safety limits.

Abstract: Methods and systems for generating illumination modulation signals, image intensifier gain modulation signals, and image sensor shutter control signals in a three-dimensional image-capturing system with one or more frequency synthesizers is disclosed. The illumination modulation signals, image intensifier gain modulation signals, and image sensor shutter signal are all coherent with one another, being derived from a common clock source. The use of frequency synthesizer concepts allow for the use of rapid modulation phase changes for homodyne operation, and further allow the use of rapid modulation frequency changes to mitigate the effects of inter-camera interference.

Abstract: An apparatus has an illumination layer having an array of a plurality of illuminators, and a circuit layer having one or more drivers for controlling the plurality of illuminators. The laser layer and the circuit layer overlap at least partially, and each driver of the one or more drivers controls at least one illuminator of the plurality of illuminators.

Abstract: An optical detecting assembly includes: a photosensitive element configured to receive an optical signal and convert it into an electrical signal; and a light guide member comprising a first portion for receiving a first light beam from a rotating light source at a first time point and guiding the first light beam to the photosensitive element and a second portion for receiving a second light beam from the rotating light source at a second time point and guiding the second light beam to the photosensitive element. A distance between the optical detecting assembly and the rotating light source is calculated based on a distance between the first portion and the second portion, a time difference between the first time point and the second time point, and a rotating speed of the rotating light source.

Abstract: A light detection and ranging receiver includes a carrier frame, a lens assembly, a first set of screws, and a light sensor assembly mounted on the carrier frame. The lens assembly includes a lens holder mounted on the carrier frame by a first set of elastic connectors attached to the carrier frame and the lens holder, and a lens installed on the lens holder. The light sensor assembly is configured to both rotate and linearly move with respect to the carrier frame, and includes a board mount and a sensor board installed on the board mount. The first set of screws are in contact with the lens holder, and are adjustable to change a distance and/or an orientation of the lens holder with respect to the carrier frame such that the lens may form an image on a predetermined area on the sensor board.

Abstract: A surveying system comprises an object to be measured having a retro-reflector and a surveying instrument main body for emitting a distance measuring light and performing a measurement based on a reflected distance measuring light, wherein the surveying instrument main body comprises a distance measuring light projecting module, a photodetector, a measuring unit, an optical axis deflector which has a reference optical axis and deflects a distance measuring optical axis, a projecting direction detecting module which detects a deflection angle and a deflection angle direction of the distance measuring optical axis, and an arithmetic control module, and wherein the arithmetic control module is configured to control the optical axis deflector, to perform a two-dimensional scan with the distance measuring light, to detect the deflection angle direction of the distance measuring light at a moment of detecting a photodetecting signal by the projecting direction detecting module, and to move an approximate center of

Abstract: A receiver assembly for receiving light pulses, a lidar module containing such a receiver assembly, and a method for receiving light pulses are proposed. There is at least one photosensitive receiver (SPAD) therein, which converts the light pulses into an electric signal. An evaluation circuit is connected to the receiver, which determines a distance between the receiver assembly and at least one object that reflects the light pulses from the electric signal, by means of a time-correlated photon counting with at least one histogram, via a time of flight of the light pulse. The evaluation circuit is configured to reduce the resolution of the distance determination starting at no further than a predetermined distance.

Abstract: A Light Detection and Ranging (LIDAR) apparatus includes a detector having a first pixel and a second pixel configured to output respective detection signals responsive to light incident thereon, and receiver optics configured to collect the light over a field of view and direct first and second portions of the light to the first and second pixels, respectively. The first pixel includes one or more time of flight (ToF) sensors, and the second pixel includes one or more image sensors. At least one of the receiver optics or arrangement of the first and second pixels in the detector is configured to correlate the first and second pixels such that depth information indicated by the respective detection signals output from the first pixel is correlated with image information indicated by the respective detection signals output from the second pixel. Related devices and methods of operation are also discussed.

Abstract: According to one embodiment, a light detector includes a conductive layer, a first element, a second element, a first member, a first insulating part, and a second insulating part. The conductive layer includes a first conductive portion and a second conductive portion. The first element includes a first semiconductor layer and a second semiconductor layer. The second element includes a fourth semiconductor layer and a fifth semiconductor layer. The first member is provided between the first element and the second element and electrically connected to the conductive layer. The first member is conductive. The first insulating part is provided between the first element and the first member. The second insulating part is provided between the second element and the first member.

Abstract: An electronic apparatus capable of determining a distance to an object based on at least first reflected light provided by a reflection of first pulsed light on the object and second reflected light provided by a reflection of a second pulsed light on the object has an input terminal to receive an electrical signal of intensity of reception light, and processing circuitry to specify, based on the electrical signal, a first duration from when the first pulsed light is emitted until when the first reflected light is received within a first measurement range, and determine, based on the first duration, a second measurement range of the second reflected light, specify, a second duration from when the second pulsed light is emitted until when the second reflected light is received within the second measurement range, and determine the distance from the electronic apparatus to the object.

Abstract: A light source unit, a light receiving unit that includes a distance image sensor in which a plurality of pixels each including a photoelectric conversion device generating electric charge corresponding to incident light and a plurality of electric charge accumulating units accumulating the electric charge and dividing and accumulating the electric charge among the electric charge accumulating units at a predetermined accumulation timing are arranged in a two-dimensional matrix pattern, a distance image processing unit that is configured to acquire a distance from a subject present in the space that is an imaging target, and a timing determining unit that is configured to determine the accumulation timing in the measurement time interval on the basis of an electric charge amount in each of the electric charge accumulating units in an inspection time interval in which the light pulse is not emitted at the accumulation timing are provided.

Abstract: In an optical detection system, a reference waveform can be used for automated analysis of a received waveform. The reference waveform can be adjusted (e.g., distorted) using information about one or more of a receive channel configuration or other aspects of the receive channel signal, facilitating a more effective comparison between a received impulse and the reference waveform. Such a comparison can be used in a time-to-digital conversion (TDC) technique, such as to provide delay values that can then be used to determine a distance between the illuminated target and an optical transceiver. Other techniques can be used to enhance range accuracy or resolution, such as using automated techniques for control of one or more of receive channel gain, summing or averaging (aggregation of received signals), or bias compensation (e.g., DC balancing).

Abstract: A Light Detection and Ranging (lidar) apparatus includes an emitter array comprising a plurality of emitter units configured to emit optical signals responsive to respective emitter control signals, a detector array comprising a plurality of detector pixels configured to be activated and deactivated for respective strobe windows between pulses of the optical signals; and a control circuit configured to provide a strobe signal to activate a first subset of the detector pixels while leaving a second subset of the detector pixels inactive.

Abstract: An imaging device includes a light source configured to operate by a light control signal having a first duty ratio; a pixel array in which a plurality of pixels are disposed, each of the plurality of pixels including a photodiode for generating electrical charges in response to a light reception signal output by the light source and reflected from a subject, and a pixel circuit for outputting a pixel signal corresponding to electrical charges of the photodiode; and a logic circuit configured to generate raw data for generating a depth image using the pixel signal, wherein the logic circuit inputs a photo control signal having a second duty ratio to the pixel circuit connected to the photodiode in each of the plurality of pixels, and wherein the first duty ratio is not an integer multiple of the second duty ratio.

Abstract: A system and method for testing a Light Detection and Ranging (LiDAR) sensor is disclosed. The system includes the LiDAR sensor radiating a plurality of LiDAR rays, a plurality of bars positioned at a predetermined distance from the LiDAR sensor, and a testing device. The method includes triggering a LiDAR sensor to radiate a plurality of LiDAR rays. The method further includes determining at least one intersection point at each of a plurality of bars upon intersection of at least one LiDAR ray from the plurality of LiDAR rays with each of the plurality of bars. The method further includes computing at least one operational parameter for the LiDAR sensor based on the intersection points, and determining one or more test results based on the one or more operational parameters.

Abstract: A sensor assembly includes a housing including a first chamber and a second chamber fluidly connected to the first chamber, a first sensor disposed in the second chamber and including a first sensor window facing outward from the second chamber, and a second sensor outside and fixed relative to the first chamber and the second chamber. The second sensor includes a second sensor window. The housing includes an intake from an exterior environment to the first chamber, a first outlet from the second chamber to the exterior environment, and a second outlet from the second chamber to the exterior environment. The first outlet is positioned to direct air across the first sensor window, and the second outlet is positioned to direct air across the second sensor window.

Abstract: A single frequency, or very narrow frequency band, microwave imaging system is described herein. A microwave imaging system can include an array transmitter; an array receiver; and a computing device that receives signals detected from the array receiver, transforms the signals received by the array receiver into independent spatial measurements, constructs an image using the independent spatial measurements, and outputs a reconstructed image. The array transmitter and the array receiver may each have a plurality of independently controllable metasurface resonant elements.

Abstract: A radar antenna includes a plurality of horns in the annular space of a munition nose cone. The horns are disposed near the exterior surface of the nose cone. In a further aspect, the nose cone may be injection molded or additively manufactured so that the horns are embedded a known distance from the exterior surface. In a further aspect, the horns placed in either a transmit mode or a receive mode so as to maintain a minimum special separation between transmitting horns and receiving horns.

Abstract: A microwave single pixel imager apparatus and method of using same. Sampling a targeted scene includes the following. A plurality of modulated antenna patterns is generated using a reflectarray. A plurality of antenna temperatures respectively corresponding to the plurality of modulated antenna patterns is measured. A retrieved scene corresponding to the sampled targeted scene is generated. Generating a retrieved scene corresponding to the sampled targeted scene includes the following. The plurality of modulated antenna patterns and the corresponding plurality of antenna temperatures are fed into a compressive sensing imaging algorithm.

Abstract: A method for use in acoustic imaging, comprising: transmitting, from a transmitter, a first sound wave pulse at a first frequency determined by a maximum sampling rate of a receiver; transmitting at least one second sound wave pulse at a frequency substantially equal to the first frequency, the first and at least one second sound wave pulses being transmitted substantially within a fraction of a sample interval of the receiver; receiving and sampling, at the receiver, a reflection of at least two of the first and at least one second pulses to generate a set of receiver samples; and expanding the set of receiver samples, based on the first frequency and a total number of the first and at least one second pulses transmitted, to generate an expanded sample set with a larger number of samples than the set of receiver samples.

Abstract: In various embodiments, methods, systems, and vehicle apparatuses are provided. A method for estimating a Hitch Articulation Angle (HAA) using Ultra-Sonic Sensors (USSs) while ensuring quality detected echo signal performance using plausibility filtering, generating at least one set of USS data based on detecting a set of echo signals generated by a plurality of USSs configured about a vehicle coupled to a trailer; determining based on a set of USS data using a selected set of geometric equations in a plausibility filtering process for an arbitrary frontal shape of the trailer; and generating at least one comparison based on at least one set of USS data estimations to a kinematic model at low speeds for ensuring that results of the kinematic model to the HAA associated with the determined trailer shape is based on a pair of detected echo signals that are deemed to have a higher signal performance.

Abstract: Techniques are disclosed for systems and methods to provide accurate and compact three dimensional (3D) capable multichannel sonar systems for mobile structures. A 3D capable multichannel sonar system includes a multichannel transducer and associated processing and control electronics and optionally orientation and/or position sensors disposed substantially within the housing of a sonar transducer assembly. The multichannel transducer includes multiple transmission and/or receive channels/transducer elements. The transducer assembly is configured to support and protect the multichannel transducer and associated electronics and sensors, to physically and/or adjustably couple to a mobile structure, and/or to provide a simplified interface to other systems coupled to the mobile structure. Resulting sonar data and/or imagery may be displayed to a user and/or used to adjust a steering actuator, a propulsion system thrust, and/or other operational systems of the mobile structure.

Abstract: A system for enhanced object detection and identification is disclosed. The system provides new capabilities in object detection and identification. The system can be used with a variety of vehicles, such as autonomous cars, human-driven motor vehicles, robots, drones, and aircraft and can detect objects in adverse operating conditions such as heavy rain, snow, or sun glare. Enhanced object detection can also be used to detect objects in the environment around a stationary object. Additionally, such systems can rapidly identify and classify objects based on the encoded information in the emitted or reflected signals from the materials.

Abstract: Provided is a detecting apparatus including a light source emitting an illumination light flux, a light receiving element receiving a reflected light flux from an object, a deflection unit deflecting illumination light flux toward the object to scan the object and deflecting reflected light flux toward light receiving element, a splitting unit allowing illumination light flux from light source to proceed toward deflection unit and allowing reflected light flux from deflection unit to proceed toward light receiving element, and a first telescope increasing a diameter of illumination light flux deflected by deflection unit, and decreasing a diameter of reflected light flux from the object in which the deflection unit is arranged so that a light path of a principal ray of illumination light flux at a center angle of view in a scanning range of deflection unit is prevented from coinciding with an optical axis of first telescope.

Abstract: There is provided a surveying instrument including a distance measuring light projecting module, a light receiving module, an optical axis deflector provided in a common portion of a distance measuring optical axis and a light receiving optical axis, a projecting direction detector which detects an optical axis deflection angle and a deflecting direction, a narrow angle image pickup module for a narrow angle of view, a distance measurement arithmetic module, and an arithmetic control module, wherein the arithmetic control module controls the optical axis deflector and the distance measurement arithmetic module, the distance measurement arithmetic module performs a distance measurement of a measuring point based on a transmission signal of a measuring light and a reception signal of a measuring light, the narrow angle image pickup module acquires a narrow angle image with reference to the distance measuring optical axis, a sighting is performed every different objects, and an acquisition of the narrow angle im

Abstract: A multipath light test device for a time of flight (TOF) module includes: a light-splitting plate configured to split light emitted from the TOF module; a first reflector plate connected to the light-splitting plate and forming a first angle with the light-splitting plate; and a second reflector plate disposed on one side opposite to the first reflector plate and forming a second angle with the first reflector plate; one part of the emitted light from the TOF module is returned to the TOF module along a first optical path after being reflected by the light-splitting plate with a first reflectivity; and the other part of the emitted light from the TOF module is transmitted through the light-splitting plate and incident to the first reflector plate and then returned to the TOF module along a second optical path.

Abstract: According to an aspect of an embodiment, operations may comprise receiving, from a LIDAR mounted on a vehicle, a first 3D point cloud comprising points of a region around the vehicle as observed by the LIDAR. The operations may also comprise accessing an HD map comprising a second 3D point cloud comprising points of the region around the vehicle. The operations may also comprise segmenting LIDAR ground points from LIDAR non-ground points in the first 3D point cloud. The operations may also comprise segmenting map ground points from map non-ground points in the second 3D point cloud. The operations may also comprise determining a pose of the vehicle by matching the LIDAR ground points to the map ground points and by matching the LIDAR non-ground points to the map non-ground points.

Abstract: A vehicle includes a LIDAR. An object recognition device: sets a space having a height from an absolute position of a road surface as a noise space; classifies a LIDAR point cloud into a first point cloud included in the noise space and a second point cloud outside the noise space; extracts a fallen object candidate being a candidate for a fallen object on the road surface based on the first point cloud; extracts a tracking target candidate being a candidate for a tracking target based on the second point cloud; determines whether horizontal positions of the fallen object candidate and the tracking target candidate are consistent with each other; integrates the fallen object candidate and the tracking target candidate whose horizontal positions are consistent with each other, to be the tracking target; and recognizes the fallen object candidate not integrated into the tracking target as the fallen object.

Abstract: A vision-cued random-access LIDAR system and method which determines the location and/or navigation path of a moving platform. A vision system on a moving platform identifies a region of interest. The system classifies objects within the region of interest, and directs random-access LIDAR to ping one or more of the classified objects. The platform is located in three dimensions using data from the vision system and LIDAR. The steps of classifying, directing, and locating are preferably performed continuously while the platform is moving and/or the vision system's field-of-view (FOV) is changing. Objects are preferably classified using at least one smart-vision algorithm, such as a machine-learning algorithm.

Abstract: A concrete marine habitat substrate tile that is portable for a human and which provides an increased calcium carbonate content and interstitial spaces for feeding and providing a habitat for developing oysters is described. Specifically provided is a reef restoration and oyster growing tile comprising: a concrete tile comprising at least 25% by weight calcium carbonate; wherein the concrete tile comprises a base and a surface disposed on the base and comprising a plurality of spaced projections and interstitial spaces; and wherein the plurality of spaced projections and interstitial spaces provide a 3-dimensional surface.

Abstract: An apparatus for detecting a fault state of an aircraft is provided. The apparatus accesses a training set of flight data for the aircraft. The training set includes observations of the flight data, each observation of the flight data includes measurements of properties selected and transformed into a set of features. The apparatus builds a generative adversarial network including a generative model and a discriminative model using the training set and the set of features, and builds an anomaly detection model to predict the fault state of the aircraft. The anomaly detection model is trained using the training set of flight data, simulated flight data generated by the generative model, and a subset of features from the set of features. The apparatus deploys the anomaly detection model to predict the fault state of the aircraft using additional observations of the flight data.

Abstract: A method of processing signal paths includes receiving an estimated location for a GNSS receiver in an environment. The method also includes generating a plurality of candidate positions about the estimated location where each candidate position corresponds to a possible actual location of the GNSS receiver. The method further includes, for each available satellite at each candidate position, modeling a plurality of candidate signal paths by ray-launching a raster map of geographical data. Here, the plurality of candidate signal paths includes one or more reflected signal paths. At each candidate position, the method also includes comparing, the plurality of candidate signal paths modeled for each available satellite at the respective candidate position to measured GNSS signal data from the GNSS receiver and generating a likelihood that the respective candidate position includes the actual location of the GNSS receiver based on the comparison.

Abstract: This problem has been addressed before, but the way of doing so is flawed and incomplete. Only larger objects can be tracked, neglecting items such as glasses, TV remotes, and headphones. Some also solely use Bluetooth tracking, which can be quick and precise, but is unreliable. Items lost far away from people with Bluetooth active their phone cannot be found using this method. This is not an option for most small, easily misplaced items. Various embodiments of the device (in one case using the name SeekR) allow for tracking of all these difficult-to-keep-track-of items. The device's small size allows it to attach to all of these items that existing solutions cannot, e.g., on the frame of glasses, e.g., the bridge, temple and/or temple tips.

Abstract: A personal navigation device includes a correlator for processing GNSS signals from a constellation of satellites A signal is received from a navigation beacon containing a repeating code word, in which the code word includes a number N of samples corresponding to N phases, and in which reception of each code word occurs within a defined time period T. The sequence of N code samples is correlated with a known code word to determine a maximum value of correlation for a particular phase of the received signal. The correlation is performed using a correlator of size M, in which M is less than N, such that N/M=P complete correlations for a partial code phase are performed such that each correlation of a partial code phase is performed within a time period of approximately T/P. All P correlations of partial code phases are completed within time T.

Abstract: A navigational apparatus and method for augmenting a GNSS signal to the GPS simulator with alternative position, navigation, or timing (PNT) data, wherein the GPS simulator encodes an RF-simulated GPS signal based on the alternative PNT data when the GNSS signal is not available or is denied. The alternative PNT data may be provided by one or more of an Inertial Measurement Unit, Inertial Navigation System (IMU/INS) module and oscillator coupled to the GPS simulator.

Abstract: Disclosed is a method for adaptive identification of erroneous GPS observed value, including: acquiring positioning information of a vehicle from a GPS sensor, and extracting first observed value data; acquiring posture information and speed information of the vehicle to acquire dead reckoning trajectory data of the vehicle; eliminating the erroneous GPS observed values based on respective data on data status value, heading significant bit, the number of satellites used and horizontal dilution of precision in the first observed value data to obtain second observed value data; constructing pose graph data based on the second observed value data and acquiring processing result information; analyzing and optimizing the processing result information to eliminate the erroneous GPS observed values of which the cost function exceeds a preset cost function threshold to obtain third observed value data; and constructing a high-precision map based on the third observed value data and three-dimensional scene map data.

Abstract: A GNSS/IMU-based tilt measurement system includes a GNSS/IMU receiver. The GNSS/IMU receiver includes a GNSS antenna, a GNSS positioning board, an IMU inertial sensor and a position transfer device. The GNSS antenna is configured to receive a satellite navigation positioning signal. The GNSS positioning board is configured to calculate coordinates of the phase center of the GNSS antenna according to a signal received by the GNSS antenna and use the coordinates of the phase center as reference coordinates for measuring a relative position point. The IMU inertial sensor is configured to measure the acceleration and the angular velocity of the receiver. The relative position transfer medium is configured to connect the reference coordinates and the coordinates of the relative position point to be measured. The position transfer device is configured to implement the measurement function of the relative position point.