Abstract: A method for detecting an activity of an object disposed within a medium at a depth ranging from about 0 to about 100 cm using a radar system, the method including establishing a baseline radar power level of the object in the medium; and detecting one or more radar data anomalies in radar data received of the medium with respect to the baseline radar power level, wherein a presence of the one or more anomalies indicates a presence of the activity of the object.

Abstract: An electronic device capable of reducing a process associated with a radar search is provided. The electronic device DEVa has a transmitting linear array antenna TXA, a receiving linear array antenna RXA, and a control circuit CTLU for controlling the transmitting linear array antenna TXA and the receiving linear array antenna RXA. The transmitting linear array antenna TXA includes a plurality of transmission antennas TXr[1] to TXr[4] arranged along the Z direction, and transmits a transmission wave. The receiving linear array antenna RXA includes a plurality of reception antennas RXr[1] to RXr[4] arranged along an X direction orthogonal to the Z direction, and receives a reflected wave of a transmission wave.

Abstract: An apparatus for detecting a target is disclosed. The apparatus of detecting a target includes: a frequency mixer configured to calculate a first beat frequency based on a transmitted signal and a received signal of first scanning and calculate a second beat frequency based on a transmitted signal and a received signal of second scanning performed with a predetermined time interval from the first scanning; a controller configured to extract a first moving component by comparing an up-chirp period frequency and a down-chirp period frequency of at least one of the first beat frequency or the second beat frequency; extract a second moving component by comparing up-chirp period frequencies or down-chirp period frequencies of the first beat frequency and the second beat frequency; and determine the moving target based on the first moving component and the second moving component.

Abstract: A radar system may include a set of analog components to perform one or more radio frequency (RF) operations during an active radar phase of the radar system. The radar system may include a set of digital components to perform one or more digital processing operations during at least a digital processing phase of the radar system. The one or more digital processing operations may be performed such that performance of the one or more digital processing operations does not overlap performance of a substantive portion of the one or more RF operations.

Abstract: A method for estimating a spin of a projectile, the method comprising obtaining from a radar transceiver a first time series comprising observations of a radial velocity of the projectile relative to the radar transceiver, calculating, from the first time series, a center velocity of the projectile, extracting from the first time series a second time series comprising a variation in the first time series around the calculated center velocity estimating a frequency of the second time series, and determining the spin of the projectile WO based on the estimated frequency of the second time series.

Abstract: A method and electronic device for radar-based face authentication anti-spoofing for determining access to the electronic device. The electronic device includes a radar transceiver and at least one processor. The at least one processor is configured to transmit, via the transceiver, a first set of signals, generate a channel impulse response (CIR) based on receipt of reflections of the first set of signals, detect a first CIR tap in the CIR, determine a selection of CIR data based on the detected first CIR tap, determine a profile matching metric based on comparison of the selection of CIR data to a set of predetermined reference signals, and determine whether to allow access to the electronic device based on comparison of the profile matching metric to a profile matching threshold.

Abstract: Implementations of the present disclosure relate to a radar receiver for a real-valued analog RF radar signal. The radar receiver comprises a quadrature mixer circuit configured to generate, from the real-valued analog RF radar signal, a complex-valued analog signal comprising an inphase (I) signal component and a quadrature (Q) signal component, an analog polyphase filter configured to filter the I- and Q-signal components of the complex-valued analog signal to generate filtered I- and Q-signal components, and an analog-to-digital converter coupled to an output of the analog polyphase filter. The radar receiver is configured to convert only one of the filtered I- and Q-signal components from the analog to the digital signal domain.

Abstract: A collision avoidance system includes a monopulse radar antenna array of monopulse radar antenna segments mounted to a vehicle with respective fixed fields of view. Each monopulse radar antenna segment comprises a comparator network configured to form a sum signal representing a summation of return signals and a first difference signal representing a first difference of the return signals. The system further includes a user interface configured to present information in a form perceptible to a person operating the vehicle and a radar antenna array controller configured to calculate a range of the object and a first (azimuth) angle of arrival of the return signal from the object. The comparator network is further configured to form a second difference signal which the radar antenna array controller uses to calculate a second (elevation) angle of arrival.

Abstract: A method for operating a stepped frequency radar system is disclosed. The method involves performing stepped frequency scanning across a first frequency range using frequency steps of a first step size, the stepped frequency scanning performed using at least one transmit antenna and a two-dimensional array of receive antennas, changing from the first step size to a second step size, wherein the second step size is different from the first step size, and performing stepped frequency scanning across a second frequency range using the at least one transmit antenna and the two-dimensional array of receive antennas and using frequency steps of the second step size.

Abstract: A radar system is described. In accordance with one example implementation, the radar system comprises a passive coupler arrangement and also a first radar chip, a second radar chip and a third radar chip. The radar chips each comprise at least one external RF contact and also a local oscillator designed to generate an RF oscillator signal at least in a switched-on state. The external RF contacts of the radar chips are coupled via the coupler arrangement in such a way that, in a first operating mode, the RF oscillator signal can be transferred from the first radar chip via the coupler arrangement to the second radar chip and the third radar chip, and that, in a second operating mode, the RF oscillator signal can be transferred from the second radar chip via the coupler arrangement to the third radar chip.

Abstract: The present invention provides a low-cost and low-volume mode A/C/S transponder positioning system to detect the position of a target aircraft, or intruder, outside the range of a secondary surveillance radar system. The system uses a signal of the intruder to pinpoint the location of the intruder. The system can be used on both the ground and on an aircraft in a full 360 degree range around the system.

Abstract: A method for retrieval of lost radial velocity in weather radar includes expanding a radial velocity area to non-meteorological echoes including sea clutter and chaff echo using raw radar data for use of a wind field calculation area, correcting radial velocity by replacing the radial velocity determined as noise using a median sign comparison method with a median calculated within a window to which the radial velocity belongs, distinguishing a lost radial velocity area by comparing the corrected radial velocity with radar reflectivity data, and retrieving lost radial velocity using a Velocity Azimuth Display (VAD) fit function representing radial velocity of particles observed along a radar radiation source at a certain elevation in the lost radial velocity area as a function of an azimuth angle. Accordingly, it is possible to improve the quality of calculated wind field using the improved radar radial velocity, and provide more accurate dynamic structure information of the precipitation system.

Abstract: A system and method for providing asymmetrical filtering to improve performance in the presence of wideband interference is herein disclosed. According to one embodiment, a method for a global navigation satellite system (GNSS) receiver includes detecting wideband interference in a received target GNSS signal, and applying an asymmetric filter to the received target GNSS signal to mitigate the detected wideband interference.

Abstract: A method for producing an interference reduced radar image comprises receiving a measured sequence of beat signals; identifying one or more interference segments within the measured sequence of beat signals, an interference segment being a segment subject to an interference; doctoring the measured sequence of beat signals by creating a doctored representation of the measured sequence of beat signals in the form of a matrix Y; creating a doctoring mask representing the doctoring of the measured sequence of beat signals, the doctoring mask being a matrix M; and estimating a reconstructed range-doppler image {circumflex over (X)} from Y and M, wherein the reconstructed range-doppler image is a range-doppler image of Y which is deconvolved using M; such that doctoring the measured sequence of beat signals at least partially removes interference effects and estimating a reconstructed range-doppler image at least partially removes image artefacts created by the doctoring.

Abstract: In an embodiment, a method of interference mitigation in a device that includes a millimeter-wave radar, includes transmitting radar signals with the millimeter-wave radar; receiving reflected radar signals with the millimeter-wave radar, the reflected radar signals corresponding to the transmitted radar signals; generating a first spectrogram based on the reflected radar signals; generating a second spectrogram indicative of movement of a non-target object; generating a compensated radar spectrogram based on the first and second spectrograms to compensate for an influence of the movement of the non-target object in the first spectrogram; and detecting a target or a property of the target based on the compensated radar spectrogram.

Abstract: A method for determining convective cell growth from weather radar reflectivity data includes receiving first weather reflectivity values and receiving second weather reflectivity values at a point in time subsequent to receiving the first weather reflectivity values, storing the first and second weather reflectivity values in cells of a three-dimensional buffer, for each of the first and second weather reflectivity values, calculating a vertically-integrated reflectivity (VIR) value for a column of cells in the three-dimensional buffer, the column of cells being associated with a latitude/longitude position, and comparing the VIR value for the second weather reflectivity values against the VIR for the first weather reflectivity values to determine a difference in the VIR values. Furthermore, the method includes displaying a cell growth hazard indication at a weather display in an area of the weather display that corresponds to the latitude/longitude position.

Abstract: A semiconductor chip comprising at least one transmit channel and/or at least one receive channel for radar signals and also a sequencing circuit is proposed. In this case, the sequencing circuit is configured centrally to determine a sequencing scheme for time-dependent functions of the transmit channel and/or of the receive channel and to drive circuit elements of the transmit channel and/or of the receive channel in accordance with the sequencing scheme.

Abstract: A radar antenna for a fill level measurement device is provided that includes at least one carrier plate and at least two antenna elements that are arranged on the carrier plate and are configured to transmit and/or to receive a radar signal, wherein each of the antenna elements includes a waveguide configured to direct the radar signal, wherein an interior volume of each waveguide is at least partially filled with a dielectric, the antenna elements being arranged at a distance from one another that is less than or equal to a wavelength of the radar signal.

Abstract: A switching device for a radar target emulator is provided comprising: at least one first switch arrangement and a second switch arrangement, each having a branching device designed to receive a first input signal and diverge it into a branch signal and a first output signal, a switch adapted to transmit the branch signal in a first switching state within the switch arrangement and to not transmit in a second switching state, and adding means designed to emit the signal transmitted in the first switching state of the switch, at least as components of a second output signal. The first switching arrangement and the second switching arrangement are interconnected in such a way that a first input signal of the second switching arrangement comprises a first output signal of the first switching arrangement, or a second input signal of the second switching arrangement comprises a second output of the first switching arrangement.

Abstract: A two-dimensional direction-of-arrival estimation method for a coprime planar array based on structured coarray tensor processing, the method includes: deploying a coprime planar array; modeling a tensor of the received signals; deriving the second-order equivalent signals of an augmented virtual array based on cross-correlation tensor transformation; deploying a three-dimensional coarray tensor of the virtual array; deploying a five-dimensional coarray tensor based on a coarray tensor dimension extension strategy; forming a structured coarray tensor including three-dimensional spatial information; and achieving two-dimensional direction-of-arrival estimation through CANDECOMP/PARACFAC decomposition.