In some examples, a system includes a weather radar device configured to transmit radar signals, receive first reflected radar signals at a first time, and receive second reflected radar signals at a second time. In some examples, the system also includes processing circuitry configured to determine a first magnitude of reflectivity based on the first reflected radar signals and determine a second magnitude of reflectivity based on the second reflected radar signals. In some examples, the processing circuitry is also configured to determine a temporal variance in reflectivity magnitudes based on determining a difference in reflectivity between the first magnitude and the second magnitude. In some examples, the processing circuitry is further configured to determine a presence of ice crystals based on the first magnitude of reflectivity, the second magnitude of reflectivity, and the temporal variance in reflectivity magnitudes.

Aspects presented herein may enable an entity that is receiving (or reading) reflected/backscattered signals from an IoT device to differentiate the reflected/backscattered signals from other reflections (e.g., noise or signals bounced from other objects). In one aspect, a wireless device transmits an indication of a positioning session to an IoT device, wherein the indication initiates the positioning session for the IoT device. The wireless device transmits, based on the positioning session, a set of PRSs to the IoT device via a plurality of transmission occasions. The wireless device receives, from the IoT device based on a reflection pattern, at least one PRS in the set of PRSs via at least one reception occasion.

Disclosed are an apparatus and a method for controlling a radar. More specifically, disclosed is a method of setting detection modes of a radar mounted to a vehicle and controlling radar transmission signals according to the detection modes. An embodiment provides an apparatus for controlling a radar including: a target detector configured to detect targets around a vehicle and classify the detected targets; a transmission pattern setter configured to set a transmission pattern of transmission signals, based on at least one piece of detection distance information of the detected targets, detection location information, detection height information, and information on a number of detected targets; and a transmission signal controller configured to select at least one array antenna from a plurality of array antennas according to the transmission pattern and radiate the transmission signals through the selected array antenna, a method thereof, and a system.

A drone detection radar configured to identify, from information present on returns reflected from a target, the presence of a drone, by identification, within Doppler information on the returns, of: i) Doppler signals being characteristic of rotating parts of a motor; ii) Doppler signals being characteristic of rotating parts of a blade; and, by identification from temporal information in the reflected returns; and iii) signals being characteristic of flashing of the blade of a drone. The target is assumed to be a drone if signals i, ii, and iii are present above respective predetermined thresholds. The largest return from a drone is often from the body, but this is often filtered by a clutter filter. The identified parameters therefore improve detection ability. The characteristic form of the Doppler signals in some instances allow the body return to be implied, thus providing information as to drone velocity.

An embodiment of a radar subsystem includes at least one antenna and a control circuit. The at least one antenna is configured to radiate at least one first transmit beam and to form at least one first receive beam. And the control circuit is configured to steer the at least one first transmit beam and the at least one first receive beam over a first field of regard during a first time period, and to steer the at least one first transmit beam and the at least one first receive beam over a second field of regard during a second time period.

A radar system for the detection of drones, including a transmitter, a receiver and a processor, wherein the processor is arranged to process demodulated return signals in a first process using a Doppler frequency filter, and to store locations of any detections therefrom, and to process the demodulated signals in a second process to look for signal returns indicative of a preliminary target having a rotational element at a location, and should a detection be found in the second process, to then attempt to match a location of the preliminary target with returns from the first process, and to provide a confirmed detection if a location of a detection from the first process matches with the location of a detection from the second process. The disclosed subject matter enables improved detection rates for drones, by looking for outputs from both the first and second processes.

In some examples, a system is configured for determining an estimated altitude of a melting layer, and the system includes a weather radar device configured to transmit radar signals and receive reflected radar signals. In some examples, the system also includes processing circuitry configured to determine the estimated altitude of the melting layer based on the reflected radar signals.

A method for calculating an altitude of a target through an apparatus for calculating an altitude of the target, which comprises a plurality of MIMO radar virtual antennas, may comprise: receiving electromagnetic waves reflected from the target through a pair of virtual antennas classified into an upper antenna and a lower antenna and alternately arranged in two columns linearly; obtaining range information and phase information of the target from the pair of virtual antennas by analyzing the electromagnetic waves; and calculating altitude information of the target from position information of the pair of virtual antennas, and the range information and the phase information.

A method for identifying an elevation misalignment angle of a radar sensor of a vehicle, including: identifying elevation angles of radar object localizations with reference to a coordinate system of the radar sensor, an elevation angle of a radar object localization being respectively identified based on radar echoes that are obtained with at least two antenna directional characteristics that differ in an elevation direction; and identifying an elevation misalignment angle based on an occurrence frequency distribution of the elevation angles of at least some of the radar object localizations; and a radar sensor for vehicles having an evaluation device embodied to carry out the method.

A method for using a radar assembly to sense an environment includes a radar system that has an antenna assembly secured for 360-degree rotation, the antenna assembly having mounted thereon at least one transmit antenna, and a first set of three or more separate fixed receive antennas, with the antenna assembly having a greater width than height so as to create a fanbeam. In the method of the present invention, the antenna assembly is rotated to a first azimuth position, and then an FMCW waveform is transmitted within the fanbeam, and reflections are received from targets in the environment while in the first azimuth position. Based on the received reflections, data is processed and stored. These steps are repeated for all other azimuths until an azimuth sweep has been completed. At that time, a full environmental data set is compiled for the environment, where the data set comprises azimuth data, range data, elevation data and RCS data. The data set is gathered and delivered to a controller for analysis.