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: The invention relates to a device and to a method for measuring an object that moves in a direction of movement along a movement axis, wherein the device has a first sensor arrangement having a first SMI sensor and a second SMI sensor, wherein the SMI sensors irradiate measurement light beams in opposite directions along a movement axis. A control and evaluation unit is configured to receive first and second measured signals, to determine a speed of the object along the movement axis from at least one of the measured signals, to detect a first characteristic change of the second measured signal, a first characteristic change of the first measured signal, and a second characteristic change of the first measured signal, and to determine an object length of the object along the movement axis.

Abstract: Presented herein are systems and methods for generating a consistent set of signals to be processed by a PVT processor. In one or more examples, a GNSS receiver can receive a plurality of signals from a plurality of signal sources. In one or more examples, the systems and methods can generate clusters that have been vetted using cost functions so as to maximize the probability that any cluster that is sent to the PVT processor contains legitimate GNSS signals, and does not include any spoofed or otherwise illegitimate signals, thereby maximizing the probability that a PVT solution produced by the PVT processor is accurate.

Abstract: In non-limiting examples of the present disclosure, systems and methods for dynamically updating contour maps are provided. A first water level for a body of water may be determined by a computing device. A location within the body of water may be identified. A second water level relating to the identified location within the body of water may be determined, and the second water level and the first water level may be compared. Upon comparing the first and second water levels, a contour map for the body of water may be automatically updated.

Abstract: An object of the present invention is to provide a time measurement device that facilitates a circuit layout. A time measurement device (20) of the present invention includes: a plurality of pixels (30) provided side by side in a first direction, and each including a single-photon avalanche diode (SPAD) disposed on a first semiconductor substrate, and each generating a first logic signal (S35) depending on detection timing in the single-photon avalanche diode (SPAD); and a time measurement section (24) that is disposed on a second semiconductor substrate attached to the first semiconductor substrate and measures the detection timing in each of the plurality of pixels (30).

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a wireless device may transmit a frequency-modulated continuous-waveform (FMCW) dual ramp radar signal over a time duration that sweeps from a first frequency to a second frequency and from the second frequency to the first frequency. The wireless device may receive a reflection of the radar signal with a first reflected part that corresponds to the first part of the radar signal and a second reflected part that corresponds to the second part of the radar signal. The wireless device may compare the first reflected part and a time-inverted version of the second reflected part to estimate a noise pattern. The wireless device may perform an action based at least in part on the noise pattern. Numerous other aspects are described.

Abstract: A vehicle is provided that includes one or more wheels positioned at a bottom side of the vehicle. The vehicle also includes a first light detection and ranging device (LIDAR) positioned at a top side of the vehicle opposite to the bottom side. The first LIDAR is configured to scan an environment around the vehicle based on rotation of the first LIDAR about an axis. The first LIDAR has a first resolution. The vehicle also includes a second LIDAR configured to scan a field-of-view of the environment that extends away from the vehicle along a viewing direction of the second LIDAR. The second LIDAR has a second resolution. The vehicle also includes a controller configured to operate the vehicle based on the scans of the environment by the first LIDAR and the second LIDAR.

Abstract: A decoy target, system, and method for protecting moving objects. The decoy target has at least two corner reflectors which reflect radar radiation, wherein the corner reflectors are arranged in a reflector matrix in a staggered manner in terms of height, width and/or depth, specified by the at least one connecting element, corresponding to a target to be simulated.

Abstract: A light ranging system including a shaft having a longitudinal axis; a light ranging device configured to rotate about the longitudinal axis of the shaft, the light ranging device including a light source configured to transmit light pulses to objects in a surrounding environment, and detector circuitry configured to detect reflected portions of the light pulses that are reflected from the objects in the surrounding environment and to compute ranging data based on the reflected portion of the light pulses; a base subsystem that does not rotate about the shaft; and an optical communications subsystem configured to provide an optical communications channel between the base subsystem and the light ranging device, the optical communications subsystem including one or more turret optical communication components connected to the detector circuitry and one or more base optical communication components connected to the base subsystem.

Abstract: A prism for a multi-beam lidar includes a top surface, a bottom surface, and at least three side surfaces positioned between the top surface and the bottom surface, at least two of the at least three side surfaces each include an emission region and a receiving region; the receiving region is positioned between the emission region and the top surface; in a direction from the top surface to the bottom surface, the emission region includes at least two reflecting surfaces positioned successively, and included angles between the at least two reflecting surfaces and the bottom surface are different from each other.

Abstract: A digital holography metrology system is provided including a heterodyne light source, an interferometric optical arrangement and a sensor arrangement. The heterodyne light source provides combined laser beams of different corresponding frequencies and wavelengths (e.g., for which each combined beam may include a corresponding wavelength laser beam and a corresponding frequency shifted laser beam, which may be orthogonally polarized). The interferometric optical arrangement utilizes the combined beams for providing an output for imaging a workpiece, for which the output includes interference beams. The sensor arrangement includes dichroic components which separate the interference beams to be directed to respective time of flight sensors. The outputs from the time of flight sensors are utilized to determine measurements (e.g., the outputs of the time of flight sensors may be utilized to determine a measurement distance to a surface point on a workpiece, etc.).

Abstract: The invention describes a method for reducing interference effects in a radar system, which has at least two transceiver units (S1, S2), which are in particular spatially separated from one another, wherein the method comprises the following steps: —a transmission step (VS1), in which a first transmission signal (sigTX1) of the first transceiver unit (S1) is sent and received to and by a second transceiver unit (S2) and a second transmission signal (sigTX2) of the second transceiver unit (S2) is sent and received to and by the first transceiver unit (S1) via a radio channel (T), wherein the transmission signals (sigTX1, sigTX2) are modulated according to an orthogonal frequency multiplex method; and—a pre-correction step (VS2), in which correction values (?1, ?n, ?2) are determined from the received transmission signals (sigTX1, sigTX2) and in particular are exchanged between the transceiver stations (S1, S2), wherein the received transmission signals (sigRX1, sigRX2) are postprocessed on the basis of the cor

Abstract: A method for contactless vital sign monitoring includes transmitting, via a transceiver, radar signals for object detection. The method also includes generating a clutter removed channel impulse response from received reflections of the radar signals a portion of which are reflected off of a living object. The method further includes identifying a set of range bins corresponding to a position of the living object. Additionally, the method includes identifying a first set of signal components representing a respiration rate of the living object and a second set of signal components representing a heart rate of the living object.

Abstract: A method of determining range and velocity information of a target in a light detection and ranging (LiDAR) system, includes determining a set of signal power density spectrums in a frequency domain based on an optical signal returned from a target, wherein a number of the set of signal power density spectrums is determined based on an expected mirror Doppler shift associated with the optical signal returned from the target. The method further includes averaging the set of signal power density spectrums to generate a compensated signal power density spectrum and detecting a peak value in the compensated signal power density spectrum to determine range and velocity information related to a target based on a corresponding frequency of the peak value of compensated signal power density spectrum.

Abstract: A passenger transport system has a device for registering users in a pass-through zone and the device includes at least two sensors, which sensors operate in accordance with the time-of-flight measurement principle, and a signal evaluation unit. Each sensor includes an emitter emitting electromagnetic waves into a detection area and a receiver, arranged adjacent to the emitter, that acquires the electromagnetic waves that were emitted by the emitter and reflected from the detection area, wherein the emitter and the receiver of each sensor are directed into the pass-through zone. At least one sensor of the device is respectively arranged on opposing sides of the pass-through zone and the principal direction axes of the detection areas of the sensors are arranged parallel to one another and orthogonal to the longitudinal extent of the pass-through zone.

Abstract: A lidar method and apparatus which makes use of two or more novel laser beams, each of the beams being wide in a first plane and narrow in a plane at right angles to the first plane. A novel communication system that can be used in the apparatus. A novel induction motor that can be used in the apparatus.

Abstract: A light detection and ranging (LiDAR) method may include generating, by a first transmitter, a first light illumination signal; generating, by a second transmitter, a second light illumination signal; receiving first return signals corresponding to the first light illumination signal; receiving second return signals corresponding to the second light illumination signal; and sampling the first return signals or the second return signals during a short-range sampling period, such that the short-range sampling period avoids a period of dazzle.

Abstract: A method of processing radar signalling, the method comprising: receiving a mask (815) that represents samples in the radar signalling that are detected as including interference. The mask (815) comprises a matrix of data having a first dimension and a second dimension, wherein the first dimension represents a fast-time axis and the second dimension represents a slow-time axis. The method further comprises performing frequency analysis on the mask (815) across each of the fast-time axis and the slow-time axis of the mask in order to provide a range-Doppler processed mask (817); and deconvolving a range-Doppler map (813) of the received radar signalling using the range-Doppler processed mask (817) in order to provide a deconvolved-range-Doppler map (814).

Abstract: A LiDAR and a movable device are disclosed. The LiDAR includes a first optical transceiving module, a first reflecting module, and a galvanometer module. The galvanometer module includes a galvanometer and a first driving mechanism. The galvanometer is configured to receive a detection light emitted from the first reflecting mirror of the first reflecting module, and scan a target object. The first driving mechanism is connected to the galvanometer, and the first driving mechanism is configured to drive the galvanometer to move between a first preset position and a second preset position.

Abstract: A method for determining a distance of an object with the aid of an optical detection apparatus and such an apparatus are described. A light signal pulse is emitted and reflected at the object, and is received as an echo light signal pulse. The echo light signal pulse is divided upon reception into temporally successive discrete reception time windows and converted into corresponding electrical energy. The end of the respective conversion is in each case assigned as the sampling time to the corresponding time window. The electrical energies of the time windows are compared in each case with a threshold value. As soon as the electrical energy of a first reference reception time window is greater than the threshold value, a linear interpolation of the temporal profile of the discrete electrical reception signal is carried out temporally before the sampling time of the first reference time window.