A method and receiver for determination of angle of arrival in one or two planes of a beam received at an antenna array comprising at least two pairs of antenna elements are provided. In some embodiments, a method includes computing a pair of difference signals, each difference signal being computed from signals from a different one of the at least two pairs of antenna elements. The method further includes determining a directional angle of arrival of the beam in one plane based on the pair of difference signals.

Systems and methods are provided in which a direction of arrival of a radio frequency (RF) signal received by a plurality of antennas is determined. A plurality of first converter receives RF signals from the plurality of antennas and outputs a minimum of a first optical signal and a second optical signal each modulated by their corresponding RF signal. A plurality of second converters receives a minimum of the first optical signal via a first optical channel that introduces a first delay and the second optical signal via a second optical channel that introduces a second delay. The second converter outputs a first RF signal that corresponds to the RF modulation on the first optical signal and a second RF signal that corresponds to the RF modulation on the second optical signal. A switch serially receives, from the second converter outputs, the first RF signal and the second RF signal. A direction finding subsystem determines a direction of arrival using a phase difference between the first RF signal and the second RF signal.

First and second superconductive sensors receive an electromagnetic signal. The first and second superconductive sensors are spaced apart such that there is a phase difference between the electromagnetic signal as received at the first and second superconductive sensors. The first and second superconductive sensors output respective first and second voltage signals corresponding to the electromagnetic signal as received by the first and second superconductive sensors. A nonlinear detector detects a voltage difference between the first and second voltage signals and provides an output signal representing the detected voltage difference. The output signal corresponds to the phase difference between the electromagnetic signal as received at the first and second superconductive sensors.

An aircraft, to a system, and to a method of geolocation for calculating the current coordinates at least in longitude and in latitude of a current position of an aircraft. Such an invention makes it possible to calculate the current coordinates in latitude and in longitude corresponding to the current position of the aircraft on the basis firstly of first and second coordinates in latitude and in longitude of two ground stations and secondly of first and second transmission directions of the radio signals.

An object orientation system, an object orientation method and an electronic apparatus are provided. A signal transmitter includes a directional antenna and emits a first wireless signal. A plurality of signal receivers are respectively disposed in a plurality of orientations. The signal receivers receive the first wireless signal and measure a plurality of first received signal strength indicators of the first wireless signal. The electronic apparatus is coupled to the signal receivers, estimates a plurality of strength variation data of the first received signal strength indicators measured by the signal receivers, and obtains orientation information of the signal transmitter according to the strength variation data corresponding to the signal receivers.

A positioning system (10) for determining location information of/for a mobile radio transmitter (1) comprises an antenna system (2) which includes a plurality of antennas (21) aimed at different directions and arranged on one common antenna carrier (20). The positioning system (10) comprises a receiver system (3) electrically connected to the antennas (21) and configured to receive via each of the antennas (21) a radio signal (7) transmitted by the mobile radio transmitter (1). The positioning system (10) further comprises a processing circuit (4) electrically connected to the receiver system (3) and configured to calculate the location information of/for the mobile radio transmitter (1) based on the radio signal received at each of the antennas (21). The location information includes at least angular direction of the mobile radio transmitter (1) with respect to the antenna system (2).

The subject matter discloses a method to determine a relative direction of a target RF transmitter, performed by a direction finding (DF) system comprising at least a pair of antennas having an electromagnetic-absorbing material between them, comprising conducting wireless communication between the target RF transmitter and each one of the antennas of the DF system, measuring the signal strength of the target RF transmitter received at each antenna, calculating the difference between the signal strength measured at each one of the antennas in the pair, and determining a relative direction of the target RF transmitter to be is the direction of the antenna within the pair of antennas in which the stronger signal was measured.

A direction finding interferometer shares receivers among antennas and aperiodically switches between those antennas. The phase differences for a subset of the antenna pairs are measured for each pulse and the results are combined with the results from subsequent pulses to resolve ambiguities. An angle of arrival common to two subsets of angles of arrival is the unambiguous angle of arrival.

A system and method to resolve angle of arrival (AOA) ambiguity in a radar system include receiving received reflections at a plurality of transceiver nodes. Each transceiver node among the plurality of transceiver nodes of the radar system receives one or more of the received reflections at respective one or more receive elements. The method includes determining candidate AOAs {circumflex over ()}.sub.i based on phases differences in the received reflections at the plurality of transceiver nodes, and determining Doppler frequencies f.sub.d.sup.i based on the received reflections. An estimated AOA {circumflex over ()} is selected from among the candidate AOAs {circumflex over ()}.sub.i based on matching metrics .sub.i between the Doppler frequencies and the candidate AOAs {circumflex over ()}.sub.i.

Radio circuitry wirelessly serves User Equipment (UE) with dynamic direction-of-arrival reception. Control circuitry determines a primary direction-of-arrival for a user signal and configures a digital filter for the primary direction-of-arrival. Detection circuitry filters the user signal with the digital filter configured for the primary direction-of-arrival and recovers user data from the user signal. The control circuitry determines increased radio noise and/or uplink utilization reconfigures the digital filter for multiple directions-of-arrival. The detection circuitry filters a subsequent user signal with the digital filter configured for the multiple directions-of-arrival and recovers additional user data from the subsequent user signal.