A millimeter-wave (mmWave) communication system for determining a location of a first device based on a known location of a second device includes a transceiver connected to a set of antennas to communicate beams of mmWaves and to perform an estimation of a channel connecting the first device and the second device and a memory to store results of the channels estimation including pairs of beam values, wherein each pair of beam values includes a beamforming angle and an energy of the beam communicated with the beamforming angle. The system also includes a processor operatively connected to the memory and configured to select from the memory multiple pairs of beam values corresponding to beamforming communication sharing the same dominant path connecting the first device and the second device, to determine a direction of the dominant path by evaluating a beamforming model for the selected pairs of beam values, and to determine the location of the first device arranged along the direction of the dominant path with respect to the location of the second device.

Disclosed are an apparatus for wirelessly transmitting power characterized by confirming the location of a receiver and transmitting wireless power to the confirmed location. More particularly, the apparatus for wirelessly transmitting power includes a beamformer configured to form beams with a first width and sequentially transmit the formed beams with the first width to different spaces that are physically separated from each other and at least partially overlap; a reception part configured to receive reception power values corresponding to the transmitted beams with the first width; a calculator configured to calculate a phase of the receiver using a plurality of high reception power values based on magnitudes of the received reception power values; and an estimator configured to estimate a location of the receiver based on the calculated receiver phase, wherein wireless power is transmitted to the estimated receiver location.

An example method for estimating the angle-of-arrival (AoA) and other parameters of radio frequency (RF) signals that are received by an antenna array comprises: receiving a plurality of radio frequency (RF) signal power measurements by a plurality of antenna elements at a plurality of RF channels; computing, by applying a machine learning model to the plurality of RF signal power measurements, an estimated RF signal parameter value; and outputting the RF signal parameter value.

This application provides a method for measuring an azimuth of a base station antenna. The method includes: obtaining angular velocity data measured by an angular motion detection apparatus that is stationary relative to a base station antenna, and obtaining a position relationship between a direction of a sensitive axis of the angular motion detection apparatus and a direction of a main lobe of the base station antenna; determining, based on the angular velocity data, a first position relationship between the direction of the sensitive axis of the angular motion detection apparatus and a true north direction; and determining an azimuth of the base station antenna based on the first position relationship and a second position relationship between the direction of the sensitive axis of the angular motion detection apparatus and the direction of the main lobe of the base station antenna.

This application provides a method for measuring an azimuth of a base station antenna. The method includes: obtaining angular velocity data measured by an angular motion detection apparatus that is stationary relative to a base station antenna, and obtaining a position relationship between a direction of a sensitive axis of the angular motion detection apparatus and a direction of a main lobe of the base station antenna; determining, based on the angular velocity data, a first position relationship between the direction of the sensitive axis of the angular motion detection apparatus and a true north direction; and determining an azimuth of the base station antenna based on the first position relationship and a second position relationship between the direction of the sensitive axis of the angular motion detection apparatus and the direction of the main lobe of the base station antenna.

The present disclosure is directed towards direction finding (DF) systems that can detect and locals a radio frequency (RF) signal (e.g. an emergency beacon) is two dimensions (i.e., azimuth and elevation). In one embodiment, a DF system comprises an array of multipolarized loop antennas coupled to a beamformer which provides monopole, dipole, and loop antenna element modal signals. The DF system may also comprise a multi-channel digital receiver system coupled to the beamformer. The multi-channel digital receiver system is configured to receive modal signals provided thereto from the beamformer which can be used for accurate two-dimensional geolocation of RF signals including, but not limited to, location of RF emergency beacon sources.

The present disclosure is directed towards direction finding (DF) systems that can detect and locals a radio frequency (RF) signal (e.g. an emergency beacon) is two dimensions (i.e., azimuth and elevation). In one embodiment, a DF system comprises an array of multipolarized loop antennas coupled to a beamformer which provides monopole, dipole, and loop antenna element modal signals. The DF system may also comprise a multi-channel digital receiver system coupled to the beamformer. The multi-channel digital receiver system is configured to receive modal signals provided thereto from the beamformer which can be used for accurate two-dimensional geolocation of RF signals including, but not limited to, location of RF emergency beacon sources.

A direction estimating device includes a plurality of antennas placed on a front surface of a board to have different main lobe directions of directivities, at least one antenna placed on a back surface of the board, a radiowave intensity obtainer that obtains a received signal strength indication (RSSI) of a radiowave received by the plurality of antennas placed on the front surface of the board, and by the at least one antenna placed on the back surface of the board, and an estimator that estimates an arriving direction of the radiowave based on the RSSI of the radiowave obtained by the radiowave intensity obtainer.

A direction estimating device includes a plurality of antennas placed on a front surface of a board to have different main lobe directions of directivities, at least one antenna placed on a back surface of the board, a radiowave intensity obtainer that obtains a received signal strength indication (RSSI) of a radiowave received by the plurality of antennas placed on the front surface of the board, and by the at least one antenna placed on the back surface of the board, and an estimator that estimates an arriving direction of the radiowave based on the RSSI of the radiowave obtained by the radiowave intensity obtainer.

A data collection device carried on board a satellite and making it possible to localize a source of interference, without using neighboring satellites, comprises: a reception device able to receive the frequency on the ground of the interference; at least three antenna points arranged on the satellite so as to be able to receive a radiofrequency signal coming from the target surface; a processor able to determine the amplitude of the interference signal at the level of each of the antenna points; a connection device able to connect successively each of the antenna points to the processor.