Abstract: A system for material detection and identification including: an RF transmitter configured for transmitting into an environment an RF signal at a first resonance frequency for a target material, wherein the first resonance frequency is obtained from a material database associating each of a plurality of materials with one or more corresponding resonance frequencies; an RF receiver configured for receiving a resultant response signal from the environment; and a processor configured for: analyzing the resultant response signal for resonance characteristics that indicate a presence of the target material, wherein analyzing includes, if the resonance characteristics are detected and no other material in the material database shares similar resonance characteristics for the first resonance frequency, reporting to a user that the target material has been identified.

Abstract: This document describes techniques and systems related to a radar system using a machine-learned model to identify the number of objects within each range-Doppler bin. For example, the radar system includes a processor that obtains radar data associated with objects and processes the radar data to generate beam vectors. The processor then uses a machine-learned model to identify the number of objects within each range-Doppler bin using extracted features (e.g., magnitude variation, signal-to-noise ratio, subarray beam vector correlations) of the beam vectors. The processor selects a particular angle-finding technique based on whether a single object or multiple objects are identified. In this way, the described systems and techniques more accurately identify the number of object in each range-Doppler bin, thus improving the computational efficiency and robustness of subsequent angle finding.

Abstract: A height measurement device and a height measurement method based on a millimeter-wave radar are provided. The height measurement device comprises a millimeter-wave radar module, a main controller, and a wake-up module. The wake-up module and the millimeter-wave radar module are connected to the main controller, respectively. The wake-up module activates the millimeter-wave radar module through the main controller. The millimeter-wave radar module sends a transmission signal and receives an echo signal, and obtains an intermediate-frequency signal based on the transmission signal and the echo signal. The echo signal is formed by the reflected back transmission signal after it encounters human head. The main controller applies continuous millimeter waves to sweep across the highest point of the human head and obtain height data based on the intermediate-frequency signal.

Abstract: Systems and techniques are provided for performing Quasi-Zenith Satellite System (QZSS) signal acquisition. For example, an example of a method for performing QZSS signal acquisition includes obtaining a modulated message signal using a frequency band and generating, based on an estimated set of signal acquisition parameters associated with an acquired signal, an energy grid of correlation codes. A series of extracted data bytes can be generated for each respective hypothesis of a plurality of hypotheses, based on a location of a peak energy within the energy grid of correlation codes. A correct hypothesis out of the plurality of hypotheses can be determined, wherein the correct hypothesis is associated with a generated series of extracted data bytes that includes a pre-determined header preamble pattern. The modulated message signal can be decoded using an initial code phase associated with the correct hypothesis.

Abstract: The radar device for a vehicle according to an exemplary embodiment of the present invention includes an antenna part including a plurality of transmitting antennas and a plurality of receiving antennas, the antenna part being formed of array antennas; a signal processor for detecting a target by processing a radar signal and a reflected signal transmitted and received through the antenna part; and a feeding part for correcting phases of the radar signal and the reflected signal through a feeding line connecting the antenna part and the signal processor, wherein the signal processor corrects a phase of a noise signal based on the phase information of a feeding line designed such that a false target corresponding to the noise signal incoming is detected at a specific angle.

Abstract: A radar device includes an oscillator that generates a transmission signal including a plurality of chirp signals, the chirp signal having a frequency that increases or decreases from an initial frequency in each predetermined sweep cycle. The oscillator changes the initial frequency of each chirp signal. A transmitter emits the transmission signal, and a receiver receives a reflected wave of the transmission signal reflected at an object and an unwanted wave as a reception signal. Circuitry is configured to estimate a phase of the reception signal from the transmission signal and the reception signal, calculate a correlation between a change pattern of the initial frequency of each chirp signal and a change pattern of the phase of the reception signal, estimate the reflected wave from the reception signal based on the correlation, and calculate a number of incoming waves based on a result of the estimation of the reflected wave.

Abstract: Provided is a radar apparatus that detects a target object with high accuracy. The radar apparatus includes: transmission circuitry, which, in operation, alternately outputs a first transmission signal with a first central frequency and a second transmission signal with a second central frequency higher than the first central frequency for each transmission period; and one or a plurality of transmission antennas, which, in operation, transmit the fast transmission signal and the second transmission signal. The second central frequency is higher than a frequency (1+1/Nc) times the first central frequency, where Nc is an integer indicating a number of times of transmission of each of the first transmission signal and the second transmission signal for the each transmission period within a predetermined duration.

Abstract: A unit cell of an array antenna includes an integrated dilation and feed circuit and an associated radiator assembly. The integrated dilation and feed circuit includes an asymmetric dilation layer, an asymmetric combiner layer, a symmetric feed layer and a symmetric slot layer. Feed circuits on the feed layer are configured to couple radio frequency (RF) signals to/from a pair of orthogonally disposed slot elements symmetrically disposed on the slot layer of the integrated dilation-feed circuit. The slot layer couples signals to and from the radiator assembly. Such unit cell may be used to provide an array antenna including an active electronically scanned array (AESA) antenna.

Abstract: Techniques described here introduce signature frequency modulation to unmodulated pulse signals as frequency chirps to enhance the security of multi-carrier phase-based ranging signals. The characteristics of the chirps may be mutually known by an initiator and a desired reflector of the ranging applications. The characteristics of the chirps may vary between the multi-carrier signals to thwart any attempt by an eavesdropper to predict the chirps. In one aspect, the characteristics of the chirps may be calculated for each timeslot of a ranging cycle by two authorized devices using a ciphering algorithm such as the Advanced Encryption Standard (AES) based on a shared security key. Each call of the AES may generate one or more pseudo-random numbers based on the shared security key and a time-varying initialization vector that increments every timeslot. Fields of the pseudo-random number may be extracted to determine the characteristics of the chirps associated with the timeslot.

Abstract: One embodiment of the present disclosure relates to a vehicle radar apparatus and a method of controlling the same. The radar apparatus according to the present embodiment may include an antenna unit including Nt transmitting antennas and Nr receiving antennas, wherein one of the Nt transmitting antennas is vertically offset from the other transmitting antennas, or one of the Nr receiving antennas is vertically offset from the other receiving antennas, a transceiver configured to control the Nt transmitting antennas to transmit a phase shift transmission signal having N different phase shift values (an) and control the Nr receiving antennas to receive a reflected signal reflected from a target, and a signal processor configured to determine a height (h) of the target based on a discrete phase shift value (amax) that is a phase shift value having the greatest reception power among N phase shift values.

Abstract: The present disclosure provides a systems and methods for processing radar data. In one example embodiment, a first digitized radar signal of an environment is received from a first radar module and a second digitized radar signal of the environment is received from a second radar module. The first digitized radar signal and the second digitized radar signal are processed, via an electronic processor, to determine a set of correction parameters. A first corrected radar signal is determined by applying the set of correction parameters to the first digitized radar signal. A second corrected radar signal is determined by applying the set of correction parameters to the second digitized radar signal. The first and second corrected radar signals are combined into a combined radar signal. A scene representation of the environment is determined based on the combined radar signal. The scene representation is provided to an autonomous driving system.

Abstract: Certain aspects of the present disclosure provide techniques for joint communication and radar sensing. A method is provided for wireless communications by a network entity. The method generally includes communicating one or more radar signals in a first set of slots. Each of the first set of slots comprises an extended cyclic prefix have a first length. The method generally includes communicating one or more signals in a second set of slots, each of the second set of slots comprising a normal cyclic prefix having a second length that is shorter than the first length.

Abstract: Example embodiments of the present disclosure relate to sensing a dynamic area on request. In an example method, a core network device receives a sensing request from a terminal device. The sensing request indicates an initial sensing area and a change tendency of the initial sensing area. The core network device transmits a sensing instruction to an access network device. The sensing instruction instructs the access network device to sense a target sensing area determined based on the initial sensing area and the change tendency. The core network device receives a sensing result of the target sensing area from the access network device. The core network device transmits a sensing response to the terminal device. The sensing response is determined based on the sensing result. In this way, resource utilization efficiency of sensing of a network device is improved and impact on communication performance of the network device is reduced.

Abstract: The disclosure provides a mounting structure of an object detection device to a vehicle body capable of improving the accuracy of object detection by the object detection device and improving the durability of the object detection device. A mounting structure of a radar device, which is an object detection device for detecting objects, to a vehicle body includes: a support bracket attached to the vehicle body side for supporting the radar device in a first direction, which is an object detection direction by the radar device; and a cover member fixed to the first direction side of the support bracket and disposed on the first direction side of the radar device. The radar device is housed in a housing chamber defined by the cover member and the support bracket.

Abstract: Aspects presented herein may improve joint communication-radar system by providing a radar reference signal with GI-FMCW waveform. Aspects presented herein may be compatible with communication-centric waveforms and thereby may apply to UEs or network entities with minimal changes if specified. In one aspect, a wireless device transmits a set of communication signals. The wireless device configure one or more parameters associated with a set of radar reference signals for radar sensing based on the set of communication signals, each radar reference signal in the set of radar reference signals including a guard interval. The wireless device transmits the set of radar reference signals associated with the one or more parameters.

Abstract: An efficient synthesis method for a radiation pattern of a conformal array antenna is provided. The method includes: step 1, establishing a field analysis model of the conformal array antenna; determining an aperture field distribution principle suitable for the conformal array antenna, and expanding distribution of an excitation I of an arbitrary curved surface source in a spherical coordinate system according to the aperture field distribution principle; and step 3, establishing an optimization model for the radiation pattern of the conformal array antenna, and performing synthesis of the radiation pattern of the conformal array antenna according to the optimization model. The method greatly improves the synthesis efficiency of a radiation pattern of a conformal array antenna while ensuring that the directional pattern requirements are met.

Abstract: A method and devices are disclosed for geo-location of wireless local area network (WLAN) devices. According to one aspect, a method for determining a corrected round trip times (RTT) resulting from communication with a WD is provided. The WD is configured with one or two short interframe spacings (SIFS). The method includes performing RTT measurements at successive times. The method includes determining a presence of one or two modes based at least in part on peaks of a kernel density estimation (KDE) surface. The KDE surface is determined from the RTT measurements. When there is only one mode, a corrected RTT is determined based on the RTT measurements and a first SIFS. When there are two modes, a corrected RTT is determined based on the RTT measurements and the first SIFS plus an SIFS offset (?), ? being based at least in part on a difference between the two modes.

Abstract: An electromagnetic non-line-of-sight imaging method based on time reversal and compressed sensing is provided. The electromagnetic signal passively scattered by the target behind the obstacle is received by the antenna, the contour imaging of the target is realized by using compressed sensing, the signal-to-noise ratio of the electromagnetic signal of the target is improved by using time reversal for the contour area, so as to achieve the purpose of staring at and detecting the non-line-of-sight target; a random radiation signal is transmitted for multiple times through active metasurface modulation, compressed sensing is performed for calculation imaging after receiving the signal to judge the number of targets and the contour area in the occluded area; for the target contour area, the amplitude and phase of signals obtained at different positions are adjusted by the active metasurface, so as to focus and scan the electromagnetic signals at different positions behind the obstacle.

Abstract: A one-bit quantization based target tracking method, device, terminal, and storage medium. The method includes acquiring echo data of each radar node in a multi-radar node system for a target; performing one-bit quantization on each echo data to obtain one-bit data; estimating a distance information and a direction of arrival of signal of the target relative to each radar node based on the one-bit data; determining, based on the distance information and the direction of arrival of signal, a position information of the target relative to each radar node; fussing the position information to obtain a tracking point of the target. By adopting one-bit quantization and multi-base site trajectory fusion processing, high-precision detection and tracking of ocean monitoring targets are achieved, which significantly enhances data processing speed and anti-interference capability, while reducing the demand for storage and transmission resources, ensuring reliability and real-time performance in complex environments.

Abstract: An interference detector for detecting interference in Global Navigation Satellite System (GNSS) includes an RF splitter, multiple detectors and a comparator. RF splitter, splits a radio frequency (RF) input signal into multiple RF output signals which are provided to respective detectors. Each of the detectors includes a bandpass filter and a peak detector. The bandpass filter filters the RF output signal into a respective GNSS frequency band and the peak detector detects the peak level of the filtered RF signal. The comparator analyzes the peak detector outputs and identifies whether interference is present in the GNSS frequency bands by comparing the peak levels to respective thresholds. Based on this analysis, the comparator outputs a signal that indicates the presence and absence of identified interference in the GNSS frequency bands.