A computer system for angle of arrival estimation receives one or more snapshots from a circular array of antennas. The computer system processes the one or more snapshots for amplitude and/or phase-based direction finding using two cascaded algorithms. The first algorithm of the two cascaded algorithms is configured to identify a target subregion from which a signal arrives. The second algorithm of the two cascaded algorithms is configured to identify a direction of the signal within the target subregion.

Disclosed are examples of systems, apparatus, methods and computer program products for locating unmanned aerial vehicles (UAVs). A region of airspace may be scanned with two scanning apparatuses. Each scanning apparatus may include one or more directional Radio Frequency (RF) antennae. The two scanning apparatuses may have different locations. Radio frequency signals emitted by a UAV can be received at each of the two scanning apparatuses. The received radio frequency signals can be processed to determine a first location of the UAV.

A method of passive location of radar transmitters implemented by at least two ESM stations, the radars having a quasi-constant scanning speed in the course of the transit over the set comprising at least two ESM stations, each of the ESM stations being able to intercept the transmission lobes of radar transmitters and to estimate their lobe transit times (LTT) and at least one station being able to estimate the angle of arrival α of the transmission lobes, the location of the radar transmitters being performed by testing the intersection between an iso-LTTD curve passing through at least the two ESM stations and a sighting straight line passing through the ESM station having measured the angle of arrival and of azimuth equal to the measured angle of arrival α.

An antenna includes antenna structure configured to receive electromagnetic radiation and including an antenna geometry. The antenna geometry is configured to cause a variable phase shift in the electromagnetic radiation based on an angular position of a direction of propagation of the electromagnetic radiation relative to azimuth. An angle-of-arrival sensor includes the antenna configured to the receive electromagnetic radiation and to produce a phase-shift signal. A method for determining an angle of arrival of electromagnetic radiation uses the angle-of-arrival sensor.

A mobile device supports positioning with positioning reference signals (PRS) on multiple beam by dividing the PRS processing into two separate modes, an acquisition mode and a tracking mode. In acquisition mode, the mobile device performs a fast scan of all of the beams from a base station transmitting PRS using less than the full set of resources for the PRS, i.e., less than the full bandwidth and/or less than the full number of repetitions of the PRS. The mobile device may select the best beams to use for positioning, e.g., based on signal strength metric. In tracking mode, the mobile device tracks the PRS from only the selected beams using the full set of resources for the PRS. The mobile device may return to acquisition mode after a predetermined number of positioning occasions or if the selected beams are no longer valid due to movement or change in conditions.

An unmanned aerial vehicle (UAV) for detecting, identifying, and locating a source emitting an interfering signal is described herein. The UAV can detect wireless network site interference within a given frequency spectrum band and locate the source of the interference based on one or more signals received by one or more antennas, such as directional antennas. The one or more antennas are located on or within a main body or one or more booms of the UAV. The UAV can be flown manually (e.g., by an operator) or automatically (e.g., by a processor or preset routine).

A method may be provided. One or more packets from a client may be received, in a block based modulation environment, at one or more switchable antennas of an access point. The access point may have a plurality of switchable antennas. Each switchable antenna may have an antenna state. The plurality of switchable antennas may be switched among such that at least five of the antenna states are sampled. Angle of arrival of the client may be calculated based on the at least five of the antenna states.

An apparatus, method and computer program for a mobile transceiver and for a base station transceiver. The method includes receiving a downlink signal from a base station transceiver of the mobile communication system via a downlink data channel, identifying a line of sight component of at least the first positioning symbol of the downlink signal based on the one or more sequences of zero-value samples and determining information related to a location of the mobile transceiver based on the one or more non-zero-value samples received within the line of sight component of the first positioning symbol. The downlink signal includes one or more positioning symbols having a first positioning symbol, wherein the first positioning symbol is based on samples in a time domain to be transmitted by the base station transceiver.

A method includes: determining a reference direction for orientation; when a first device rotates around an obstruction, receiving a wireless signal sent by a second device, and obtaining a link quality parameter value according to the received wireless signal; determining a position having greatest shadow fading of the first device according to the obtained link quality parameter value, and using a pointing direction of the position having greatest shadow fading of the first device as a first pointing direction; and determining, according to an included angle θ.sub.1 between the reference direction and the first pointing direction and an included angle θ.sub.2 between the reference direction and a second pointing direction, a direction in which the second device is located, where the second pointing direction is a pointing direction of the first device.

A system and method for determining an Angle of Arrival (AOA) for frequency modulated communications. The system may include first and second antennas spaced apart from each other by a distance, and configured to receive wireless communications in the form of a modulated signal. The system may determine a phase difference between the received signals based on one or more samples of a dedicated portion of the received signals, where one or more aspects of the dedicated portion is variable.