A patch antenna and a radar apparatus having different beam tilts with respect to frequencies are provided. In the patch antenna including a plurality of patches arranged along a power feed line, lengths of patches relating to a resonant frequency are implemented to be different from distances between patches relating to a radiation angle in the elevation direction without mechanical tilting. Thus, the patch antenna can easily expand coverage in the elevation direction without raising a noise floor, and since a gain is high, the patch antenna can detect a smaller object.

A drone detection radar can include a plurality of antenna systems, each antenna system being arranged to transmit a signal into an associated sector, and to receive signals reflected from targets in the sector, the sectors collectively forming a monitored volume, and wherein a sub-set of the antenna systems are active at any one time, with the active sub-set of antenna systems being arranged to monitor their respective volumes for a duration sufficient to measure Doppler signals associated with slow moving drones, with the radar being arranged to switch to a different sub-set of antenna systems after each duration, such that the whole volume is monitored within a predetermined period. Combining a staring array from an antenna system with a plurality of switched antenna system allows drones to be both detected and tracked, with appropriate selection of the predetermined period.

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.

According to the invention, a device and a method are provided for determining the position of an object, in particular a moving object, in the three-dimensional space. The device comprises at least two switchable transmitting antennas having a different vertical position of the phase center as well as a plurality of receiving antennas which are arranged in series. The transmitting antennas are arranged in the horizontal direction and at a distance that corresponds to the distance of the receiving antennas. The transmitting antennas are vertically offset with respect to each other by a value that is less than or equal to half the free-space wavelength of the transmitted signal. The transmitting antennas can otherwise be arranged at any position around the receiving antenna. Horizontal beam sweep across a wide angular range is carried out according to the method of digital beamforming. The measurement of the vertical object position is carried out by phase measurement between the antenna beams when the transmitting antennas are sequentially switched.

Systems and methods include emitting transmit signals from two or more non-coherent radar systems. A method also includes receiving reflected signals at the two or more non-coherent radar systems based respectively on the transmit signals from each of the two or more non-coherent radar systems being reflected by one or more objects. The non-coherent radar systems exhibit an uncorrelated phase relationship in the reflected signals received at each of the two or more non-coherent radar systems. The reflected signals are processed to obtain a joint metric that is used to identify and estimate an angle to each of the one or more objects.

A radar system for use in a vehicle moving in a first direction may include a plurality of antenna elements spaced apart in a second direction; and a controller operably connected to the plurality of antenna elements. The controller may be configured record signals received by each antenna element at each time instant of a plurality of time instants; calculate a position in the first direction of each antenna element for each time instant based on a velocity hypothesis; calculate a virtual two-dimensional antenna array response based on the signal received by each antenna element at each time instant and the position in the first direction of each antenna element at each time instant; calculate a beamforming spectrum based on the virtual two-dimensional antenna array response; and identify a peak in the beamforming spectrum to identify an elevation angle from the vehicle to a target relative to the first direction.

An acoustic phased array antenna system comprising a plurality of omnidirectional receiving elements for addressing close-in fields and a plurality of non-omnidirectional receiving elements for addressing remote fields with the combined elements used to extend the maximum range of the antenna system. The non-omnidirectional receiving elements can be formed by adding focusing structures such as cylindrical or oval lenses in the receiving path of omnidirectional receiving elements. Antennas with a plurality of isotropic radiating and a plurality of non-isotropic radiating elements can be utilized for sonar and ultrasound systems. An acoustic phased array antenna system comprising a first plurality of receiving elements with a first field of view and a second plurality of receiving elements with a second field of view that is at least 50% narrower. An acoustic phased array with a plurality of isotropic radiators and a plurality of non-isotropic radiators to extend the range of the system.

This document describes techniques and systems that enable a smartphone-based radar system facilitating ease and accuracy of user interactions with a user interface. The techniques and systems can be implemented in an electronic device, such as a smartphone, and use a radar field to accurately determine three-dimensional (3D) gestures that can be used in combination with other inputs, such as touch or voice inputs, to interact with the user interface. These techniques allow the user to make 3D gestures from a distanceand enable seamless integration of touch and voice commands with 3D gestures to improve functionality and user enjoyment.

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.

This document describes techniques and systems that enable a smartphone-based radar system facilitating ease and accuracy of user interactions with displayed objects in an augmented-reality interface. The techniques and systems use a radar field to accurately determine three-dimensional (3D) gestures that can be used to interact with augmented-reality (AR) objects that are presented on a display of an electronic device, such as a smartphone. These techniques allow the user to make 3D gestures from a distancethe user does not have to hold the electronic device steady while touching the screen and the gestures do not obstruct the user's view of the AR objects presented on the display.