Abstract: A radar apparatus includes: a first transmitter antenna that transmits a first electric wave having a predetermined frequency to a measurement part of an object; a second transmitter antenna that transmits a second electric wave having the same frequency as the frequency of the first electric wave to the measurement part from a position different from that of the first transmitter antenna; a receiver antenna that receives the first electric wave and the second electric wave which a constructive interference occurs between and are reflected by the measurement part, and output a reception signal; and a radar that outputs a Doppler signal according to a change in the measurement part on the basis of the reception signal, and the first transmitter antenna and the second transmitter antenna are adjusted to respective locations where the constructive interference occurs between the first electric wave and the second electric wave.

Abstract: The present disclosure relates to a radar level gauge having a tank feed through structure with an elongated transmission member, wherein an inner surface of a dielectric sleeve is in abutment with, and encloses, a radially extending protrusion of the transmission member such as to conform with the shape of the radially extending protrusion. The present disclosure also relates to a method of manufacturing such a tank feed through structure.

Abstract: An estimation device includes: M transmission antenna elements each transmitting a first transmission signal; N transmitter-receivers each including a reception antenna element and receiving, over a predetermined period, a first reception signal including a reflection signal that is the first transmission signal reflected by a first living body, using the reception antenna element; a memory storing training signals that are second reception signals obtained by causing the N transmitter-receivers to preliminarily receive second reception signals including reflection signals that are second transmission signals transmitted from the M transmission antenna elements to a second living body and reflected therefrom; a first vector calculator calculating a first vector for each training signal and each first reception signal by respective predetermined methods; and a circuit identifying the first living body or estimating an orientation of the first living body by a predetermined method, using correlation coefficient

Abstract: In an embodiment, a method includes: transmitting a plurality of radar signals using a millimeter-wave radar sensor towards a target; receiving a plurality of reflected radar signals that correspond to the plurality of transmitted radar signals using the millimeter-wave radar; mixing a replica of the plurality of transmitted radar signals with the plurality of received reflected radar signals to generate an intermediate frequency signal; generating raw digital data based on the intermediate frequency signal using an analog-to-digital converter; processing the raw digital data using a constrained L dimensional convolutional layer of a neural network to generate intermediate digital data, where L is a positive integer greater than or equal to 2, and where the neural network includes a plurality of additional layers; and processing the intermediate digital data using the plurality of additional layers to generate information about the target.

Abstract: The invention relates to a radar antenna arrangement (1) for a vehicle (2), comprising at least one vehicle component (3), wherein the radar antenna arrangement (1) comprises a plurality of radar devices (4) which are configured to transmit and/or receive a radar beam (12). The radar devices (4) are arranged on a component surface (5) of the vehicle component (3). The invention provides for the radar antenna arrangement (1) to comprise at least one antenna row (6) for determining an azimuthal angle (10) of the radar beam (12), said antenna row comprising a plurality of the radar devices (4). Directly adjacent radar devices (4) have respective horizontal distances (8) from one another. The radar antenna arrangement (1) comprises at least one antenna column (7) for determining an elevation angle (11) of the radar beam (12), said antenna column comprising a plurality of the radar devices (4). Directly adjacent radar devices (4) have respective vertical distances (9) from one another.

Abstract: An angle measuring device includes an antenna device having antenna elements equally spaced along a first axis and a second axis, respectively, a selecting unit that selects phase differences with which a variance thereof becomes a predetermined value or less, from a plurality of phase differences of signals received from a transmission device by the antenna elements, an azimuth angle computing unit that computes an azimuth angle of the transmission device from a ratio of a first phase difference between signals received by two antenna elements spaced by a predetermined distance along the first axis and a second phase difference between signals received by two antenna elements space by the predetermined distance along the second axis, and an elevation angle computing unit that computes an elevation angle of the transmission device, based on the computed azimuth angle and the first or second phase difference.

Abstract: A method and system for measuring a liquid level in a pressure vessel, the method comprising: transmitting an electromagnetic signal through a wave guide in the form of an elongate solid rod (5) with bottom end immersed in the liquid and detecting a signal generated by the reflection on the surface of the liquid.

Abstract: A radar system includes a hybrid-power amplifier and a power control unit coupled to the hybrid-power amplifier. The power control unit is configured to control the amplification of a chirp signal output by the radar system based upon an assessment of an interchirp time provided by a chirp profile. The interchirp time is a time difference between a first chirp signal and a second chirp signal that are to be output by the hybrid-power amplifier. When the power control unit determines that the interchirp time is less than an interchirp time threshold, a fast-power loop control configuration is used to control the transmitted output power at hybrid amplifier level. When the power control unit determines that the interchirp time is equal to or greater than the interchirp time threshold, a slow-power loop configuration or a combination of the slow-loop configuration and the fast-loop configuration is used to control the transmitted output power at the hybrid-power amplifier.

Abstract: Methods and apparatus are provided that may simplify and enhance the location of nodes in a network, including ED and mobile TPs, even if all or many of the nodes are mobile. The methods may be used to enable single TP positioning, and may be used to reduce synchronization error. The provided methods make use of smart reflectors having known location. By processing a combination of signals, which may include an original transmitted signal, and/or one or more reflected signals, the location of a receiving node can be determined. Media tagging may be employed to allow a receiver to detect the identity of the nearby reflectors (with known locations) and based on the identity determine the locations of the reflectors. Using this information, the receiving node can detect its location regardless of knowing the transmission source and/or location.

Abstract: Architectures and techniques for radar interference detection are provided. A radar sensor system in accordance with the present disclosure may receive, via a radio frequency (RF) receiver, radar signals including a radar signal of interest and one or more interfering radar signals. The radar sensor system may calculate a Doppler spectrum for each of the radar signals and perform a chirplet transform on the Doppler spectrum to generate various waveform parameters. A Principal Component Analysis (PCA) may be performed on the waveform parameters to extract frequency features of the radar signals. The radar sensor system may classify the frequency features using a classifier to identify interfering frequency features associated with the interfering radar signals using a classifier. The radar sensor system may further extract interfering waveform information based on the interfering frequency features of the interfering RF signals.

Abstract: A wireless multimode system includes: an array of N antenna elements that includes a first portion of M antenna elements and a second portion of L antenna elements; M transmission amplifiers configured to transmit, via the M antenna elements, frames of transmit data, where the frames of transmit data include transmit radar signals and transmit communication signals; M reception amplifiers configured to receive, via the M antenna elements, frames of receive data, where the frames of receive data includes receive communication signals; and L reception amplifiers configured to receive, via the L antenna elements, receive radar signals; and a resource scheduler configured to allocate bandwidth for transmit radar signals and transmit communication signals within the frames of transmit data based on one or more predetermined parameters.

Abstract: The invention discloses a device (1) for characterizing in real time the actimetry of a subject, having: a radar (2) emitting and receiving radar signals, and having a software interface for configuring the shape of the signal emitted; processing and computing means (3) coupled to the radar (2), having a trained classifier (3a) using a database, said processing and computing means (3) being configured to perform in real time: —a capture of color micro-Doppler images (6) having several color channels (R, V, B), each having micro-Doppler signatures (6a) with color pixels the value of which is a function of a reflectivity and a speed of the subject; —a processing of the micro-Doppler images (6) for: computing a so-called monochromatic image having monochromatic pixels, each having a given monochromatic intensity, on the basis of the color pixels of each color micro-Doppler image; transforming the monochromatic image into a binary image by segmentation, according to a binary luminous intensity threshold, of the m

Abstract: An antenna device is formed in such a manner that reception antennas are arranged at regular intervals between two transmission antennas adjacent to each other among transmission antennas, and a spacing between the transmission antenna and the transmission antenna has a width obtained by adding an integral multiple of a spacing dRx between each two of the reception antennas to a width obtained by dividing the spacing dRx by the number NTx of the transmission antennas.

Abstract: A system for using wireless signals to detect objects of a certain type, such as concealed weapons, leverages the fact that different objects have different resonance characteristics. The system transmits wireless signals of different frequencies, and returns from such signals are measured. The return of a signal from an object at a resonant frequency of the object will be stronger than a return of a signal from the object at a non-resonant frequency. The system analyzes the returns in an effort to determine when a return is sufficiently large to indicate that it was reflected from an object of interest. When an object of interest is detected, the system adjusts a characteristic of the system, such as antenna orientation or pulse shape, based on an estimated location of the object, and then runs a test to confirm the detection of the object, thereby eliminating at least some false positives.

Abstract: A monitoring system for a combine harvester having a header for harvesting a crop and a residue spreading system for spreading a crop residue. The monitoring system includes a sensing system configured to provide one or more measurement waves that intersect a flow of crop residue discharged by the spreading system and receive a plurality of response waves reflected from the crop residue. The system further includes a processing unit configured to receive a response signal of the sensing system; process the response signal; and determine, based on the response signal, a density and velocity distribution of the crop residue across a two-dimensional measurement area. The response signal is representative of the plurality of response waves reflected from the crop residue. The measurement area is at an end of a trajectory of the crop residue towards a deposit area.

Abstract: A method for automatic detection of antenna site conditions, ASC, at an antenna site, AS, of an antenna, A, the method comprising the steps of providing (S1) signal source observations, SSO, derived from signals received by the antenna, A, from at least one signal source, SS, and transforming (S2) the signal source observations, SSO, into images fed to a trained image-processing artificial intelligence, AI, model which calculates antenna site conditions, ASC, at an antenna site, AS, of the respective antenna, A.

Abstract: A computing system including a processor configured to train a synthetic aperture radar (SAR) classifier neural network. The SAR classifier neural network is trained at least in part by, at a SAR encoder, receiving training SAR range profiles that are tagged with respective first training labels, and, at an image encoder, receiving training two-dimensional images that are tagged with respective second training labels. Training the SAR classifier neural network further includes, at a shared encoder, computing shared latent representations based on the SAR encoder outputs and the image encoder outputs, and, at a classifier, computing respective classification labels based on the shared latent representations. Training the SAR classifier neural network further includes computing a value of a loss function based on the plurality of first training labels, the plurality of second training labels, and the plurality of classification labels and performing backpropagation based on the value of the loss function.

Abstract: This document describes techniques and systems for a partially-learned model for speed estimates in radar tracking. A radar system is described that determines radial-velocity maps of potential detections in an environment of a vehicle. The model uses a data cube to determine predicted boxes for the potential detections. Using the predicted boxes, the radar system determines Doppler measurements associated with the potential detections that correspond to the predicted boxes. The Doppler measurements are used to determine speed estimates for the predicted boxes based on the corresponding potential detections. These speed estimates may be more accurate than a speed estimate derived from the data cube and the model. Driving decisions supported by the speed estimates may result in safer and more comfortable vehicle behavior.

Abstract: A method and apparatus for determining a velocity and a direction of arrival (DoA) of an object includes transmitting a signal using a determined signal transmission order of transmission antennas, receiving a reflected signal with respect to the transmitted signal using reception antennas, generating virtual antennas based on an arrangement of the transmission antennas and an arrangement of the reception antennas, generating virtual signals with respect to the virtual antennas based on the reflected signal and the virtual antennas, calculating a first estimated phase and a second estimated phase that are different from each other based on the virtual signals, and determining the velocity and the DoA of the object concurrently based on the first estimated phase and the second estimated phase without performing additional processing.

Abstract: Reception antennas include first antennas at positions different in a first direction, second antennas at positions different in a second direction perpendicular to the first direction, and a third antenna different from the first or second antenna. The first and second antennas include one overlapping antenna. The third antenna is arranged at a position different in the second direction from a position of the first antennas. The third antenna is arranged at a position a prescribed spacing apart in the first direction from a position of the second antennas. At least one spacing of the first antennas is the prescribed spacing. Transmission antennas include fourth antennas arranged in the first direction and fifth antennas arranged in the second direction. The fourth antennas and the fifth antennas include one overlapping antenna. A spacing of the fourth antennas is wider in the first direction than an aperture length of the first antennas.