Abstract: A method and structure for solving a Doppler ambiguity problem in a time-division-multiplexed (TDM) frequency modulated continuous wave (FMCW) radar apparatus are proposed. In a frame of a waveform signal transmitted by one transmitting antenna in the TDM FMCW radar apparatus, at least three consecutive chirps having different periods are included for each chirp loop. A Doppler frequency may be determined from phase difference values between the three consecutive chirps measured from an FMCW radar signal received at a receiving antenna. The at least three consecutive chirps having different periods are configured to differ in at least one of an idle time between the chirps or a ramp time of the chirp.

Abstract: In an apparatus for detecting a target using a radar according to one aspect of the present invention, a first radar and a second radar, which are multi-channel radars each including a plurality of transmitting antennas and a plurality of receiving antennas, are installed to be spaced apart from each other, and position information of a target and velocity vector information of the target are calculated from first position information and first velocity information of the target acquired from the first radar and second position information and second velocity information of the target acquired from the second radar and then are used to detect and track the target.

Abstract: Transmitting antennas and receiving antennas are arranged such that a plurality of virtual antennas have the same position in a time-division-multiplexed (TDM) frequency modulated continuous wave (FMCW) radar apparatus. At least three peculiar chirps, at least one of which is included in a chirp loop of each of waveform signals transmitted by the plurality of virtual antennas having the same position, are respectively positioned in consecutive time slots and have different periods. A Doppler frequency may be uniquely determined from phase difference values between the at least three peculiar chirps respectively positioned in consecutive time slots measured from FMCW radar signals received at the plurality of virtual antennas.

Abstract: In an in-cabin radar apparatus, transmitting antennas are disposed at one side in a direction parallel to a control circuit and disposed in a line in a vertical direction, and receiving antennas are disposed at one side in a direction perpendicular to the control unit and disposed in a line in a horizontal direction. Each transmission side feed line may be perpendicularly connected to one of the transmitting antennas, and each receiving side feed line may be perpendicularly connected to one of the receiving antennas. Each of a distance between the transmitting antennas and a distance between the receiving antennas may be implemented to be less than or equal to half of a transmitting and receiving wavelength.

Abstract: A posture recognition apparatus using radar according to the present invention includes a radar sensor module configured to process reflected signals reflected from objects positioned in a detection region and output a four-dimensional (4D) point cloud in units of frames, a tracking module configured to track the objects in the output 4D point cloud and reflect a position recognition result fed back from a posture recognition module to track the objects, and the posture recognition module configured to classify types of the objects for each track using a deep learning model based on pieces of output information about tracks, recognize a posture when the object is a person as a classification result of the track, and feed a posture recognition result of the corresponding track back to the tracking module.

Abstract: A radio detection and ranging (RADAR) level gauging apparatus measures a level of liquid in a storage tank. The apparatus includes an antenna that emits a RADAR signal and receives the signal reflected from the level interface. The antenna has a lens and an absorber to reduce side lobes of the signal. The apparatus further includes a controller which performs transmission control, reception control, and level measurement control using the received RADAR signal. The distance from the emission position of the RADAR signal to the level interface is measured, and thus a level can be determined.

Abstract: A radar apparatus for detecting a target object is provided, which can improve target object detection performance by improving a Field of View (FOV) and can be widely used in various fields such as robotics and Internet of Things (IoTs) devices, as well as autonomous vehicles.

Abstract: A radar apparatus and a radar signal processing method are provided. The radar apparatus includes a plurality of transmitting antennas, a plurality of non-uniformly and linearly deployed receiving antennas, a sensor signal processor configured to calculate target range-Doppler data from signals input from a receiving antenna arrangement according to virtual antennas while sequentially driving the plurality of transmitting antennas, and a target position calculator configured to calculate position data of a target from arrangement mapped data obtained by rearranging the virtual antenna-specific range-Doppler data output from the sensor signal processor with reference to antenna configuration related information.

Abstract: The present disclosure relates to an image radar apparatus with a vertical feeding structure using a waveguide, which can reduce the size of a radar apparatus while reducing a feeding loss, have excellent boresight gain, and reduce an interval between antenna patches due to the vertical feeding structure using waveguides.

Abstract: One-dimensional data obtained by performing a Fourier transform on a digitally converted frequency modulated continuous wave (FMCW) radar signal at every pulse repetition interval is input to a recurrent neural network (RNN) to find the probability of the existence of a target in each range index. The range indices, i.e., bit frequencies are selected based on the probability. In order to reduce the size of the RNN, windowing may be applied. In addition, a speed-index-specific coefficient value may be calculated by accumulating and performing a Fourier transform on the selected bit frequencies in which the target exists over a plurality of pulse repetition intervals. Thus, it is possible to calculate the speed of the target.

Abstract: A radar apparatus and a radar signal processing method are provided. The radar apparatus includes a plurality of transmitting antennas, a plurality of non-uniformly and linearly deployed receiving antennas, a sensor signal processor configured to calculate target range-Doppler data from signals input from a receiving antenna arrangement according to virtual antennas while sequentially driving the plurality of transmitting antennas, and a target position calculator configured to calculate position data of a target from arrangement mapped data obtained by rearranging the virtual antenna-specific range-Doppler data output from the sensor signal processor with reference to antenna configuration related information.

Abstract: Two-dimensional data obtained by performing a Fourier transform on a digitally converted FMCW radar signal at every pulse repetition interval over N pulse repetition intervals is input to a convolutional neural network (CNN) to find the probabilities of the existence of a target in range indices. The range indices, i.e., bit frequencies are selected based on the probabilities of the existence of the target. In order to reduce the size of the CNN, windowing is applied to the two-dimensional data. A speed-index-specific coefficient value may be calculated by re-performing a Fourier transform on range data for the selected bit frequencies. Thus, the range and speed of the target may be calculated.

Abstract: Provided is a method of measuring eccentricity of a blind via hole formed in a printed circuit board including an inner-layer board and an outer-layer board that are bonded by thermocompression bonding. The method includes acquiring, by a microscope camera, an image by photographing a marker which is formed on a surface of the outer-layer board and a blind via hole which is exposed upward through a marker hole formed in a center of the marker with a microscope camera, and measuring, by computing equipment connected to the microscope camera, eccentricity indicating a separation distance and a separation direction from central coordinates of the marker hole to central coordinates of the blind via hole using a distance between an end point of the marker hole and an end point of the blind via hole which are included in the image.

Abstract: Provided is a method of measuring eccentricity of a blind via hole formed in a printed circuit board including an inner-layer board and an outer-layer board that are bonded by thermocompression bonding. The method includes acquiring, by a microscope camera, an image by photographing a marker which is formed on a surface of the outer-layer board and a blind via hole which is exposed upward through a marker hole formed in a center of the marker with a microscope camera, and measuring, by computing equipment connected to the microscope camera, eccentricity indicating a separation distance and a separation direction from central coordinates of the marker hole to central coordinates of the blind via hole using a distance between an end point of the marker hole and an end point of the blind via hole which are included in the image.

Abstract: In an in-cabin radar apparatus, transmitting antennas are disposed at one side in a direction parallel to a control circuit and disposed in a line in a vertical direction, and receiving antennas are disposed at one side in a direction perpendicular to the control unit and disposed in a line in a horizontal direction. Each transmission side feed line may be perpendicularly connected to one of the transmitting antennas, and each receiving side feed line may be perpendicularly connected to one of the receiving antennas. Each of a distance between the transmitting antennas and a distance between the receiving antennas may be implemented to be less than or equal to half of a transmitting and receiving wavelength.

Abstract: Provided is a method of measuring uniformity of a signal line pattern formed on a printed circuit board.

Abstract: Provided is a radio detection and ranging (radar) point cloud-based posture determination system, which clusters a point cloud acquired using radar to generate a cluster, calculates predefined features of the cluster, and determines a posture of a target through a deep learning model that has trained the calculated features.

Abstract: Transmitting antennas and receiving antennas are arranged such that a plurality of virtual antennas have the same position in a time-division-multiplexed (TDM) frequency modulated continuous wave (FMCW) radar apparatus. At least three peculiar chirps, at least one of which is included in a chirp loop of each of waveform signals transmitted by the plurality of virtual antennas having the same position, are respectively positioned in consecutive time slots and have different periods. A Doppler frequency may be uniquely determined from phase difference values between the at least three peculiar chirps respectively positioned in consecutive time slots measured from FMCW radar signals received at the plurality of virtual antennas.

Abstract: In a point cloud of a 4-dimensional radar signal, Doppler information of each point is encoded with color information of that point. A 3-dimensional color point cloud is processed to recognize a shape of a target. A one-dimensional array feature vector generated by integration of feature maps extracted by processing 2-dimensional multi-view color point clouds with a convolution neural network (CNN) is processed by a recurrent neural network (RNN) to recognize the shape.

Abstract: A method and structure for solving a Doppler ambiguity problem in a time-division-multiplexed (TDM) frequency modulated continuous wave (FMCW) radar apparatus are proposed. In a frame of a waveform signal transmitted by one transmitting antenna in the TDM FMCW radar apparatus, at least three consecutive chirps having different periods are included for each chirp loop. A Doppler frequency may be determined from phase difference values between the three consecutive chirps measured from an FMCW radar signal received at a receiving antenna. The at least three consecutive chirps having different periods are configured to differ in at least one of an idle time between the chirps or a ramp time of the chirp.