There is disclosed a method for determining the impact point of a projectile fired at a target (15) tracked by use of a radar antenna (11) through a dedicated antenna beam, the method being characterized in that it comprises at least a step of measuring the range and bearing of the projectile based upon the use of said radar antenna (11) and said dedicated antenna beam, a step of Doppler filtering distinguishing the projectile measurements from the tracked target (15) and sea clutter measurements, and a step of determining the projectile trajectory (131) from a plurality of range and bearing measurements performed at successive instants of time (t.sub.i), and a step of determining the impact point of the determined projectile based upon the projectile trajectory (131). The current invention can be applied to splash spot location prediction and miss distance indication.

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.

An FMCW radar sensor and a method for localizing a radar target, in which FMCW radar measurements are performed with transmitting antennas having different fields of view which differ in terms of an aperture angle and/or a range, the measurements each encompassing temporally interleaved sequences of ramps, and measurements with different fields of view being temporally interwoven with one another; ambiguous values for the relative velocity of the radar target being determined from a position of a peak in a two-dimensional spectrum; phase relationships between spectral values of spectra being checked for agreement with phase relationships expected for several of the determined values of the relative velocity; and on the basis thereof an estimated value for the relative velocity of the radar target being selected from the determined periodic values of the relative velocity.

A SYSTEM FOR DETECTING AND VISUALIZING TARGETS BY AIRBORNE RADAR, comprising a plurality of N antennae with a narrow beam in elevation and wide in azimuth, regularly disposed on a rotary base coupled to an engine, the elevation orientations of said antennae being staggered according to a defined pattern, each antenna being associated to a radar device endowed with computer means furnishing information relating to distance, azimuth, elevation and speed of fixed and moving obstacles above and below the plane of said rotary base. Some antennae point towards a place above the horizon, the angles of view being progressively descending so as to cover a volume that extends above and below the plane of the horizon, and may reach the ground. Said volume results from the sum of the volumes of superimposed cones, each cone corresponding to an elevation angle. The system combines the images of the N conical volumes to provide the pilot or operator a three-dimensional image.

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.

A radar apparatus (5) for detecting multipath signal propagation when determining an elevation angle of an object, comprising an antenna array with which the radar apparatus is arranged to form at least three separate antenna beams (11, 12, 13) comprising a first antenna beam (11) having an angle of elevation above horizontal, and a separate second antenna beam (12) having an angle of elevation at or above horizontal which is less than that of the first antenna beam, and a separate third antenna beam (13) having an angle of elevation below horizontal. The apparatus is arranged to transmit radio pulses from the antenna array; to receive return radio signals within the first, second and third antenna beams; to calculate a measure of the magnitude of a return radio signal received within the third antenna beam using all of said received radio signals collectively; and, to detect multipath signal propagation using said measure.

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.

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.

A radar device includes: a deriving unit configured to derive detection distances of a target existing in an area near a vehicle equipped with the radar device, based on reception signals acquired by transmitting a radar transmission wave to the area near the vehicle and receiving a reflected wave from the target; an acquiring unit configured to acquire a distance at which a maximum value of reception powers was detected, and a distance at which a minimum value of the reception powers was detected, among the detection distances sequentially derived by the deriving unit; and a determining unit configured to determine whether the target is an upper object which will not collide with the vehicle, based on the distances acquired by the acquiring unit.