A system for detecting fake information about a vehicle location may include a radio signal receiver configured to receive a radio signal from a communication system; a message receiver configured to receive the radio signal to generate a message and determine the message to generate information about a location of the communication system; a radio signal incident angle calculator configured to generate a radio signal incident angle; an azimuth calculator configured to generate a location information azimuth angle by use of the information about locations of the communication system and a receiving vehicle, and a fake vehicle generated by the communication system; and a location information fake detector configured to determine whether location information of the fake vehicle is faked by use of a difference value between an angle corresponding to a reference axis of the location information azimuth angle and the location information azimuth angle.

The invention relates to a method for determining features of an electromagnetic wave received by a reception system (22), the reception system (22) comprising at least two reception channels (13), each reception channel (13) comprising an antenna (21) and a reception chain (14), each reception chain (14) being capable of delivering a value representative of the power delivered by the corresponding antenna (21) after reception of the wave by the reception system (22), the features comprising at least the direction of arrival of the received wave, the method comprising a step of providing a measurement vector, the method further comprising the following steps: comparing the measurement vector to calibration vectors, and determining features of the received wave from the result of the comparison.

A receiver-system comprising a path-switching-unit, a redirect-switching-unit, a plurality of receive-paths, and a processor. The path-switching-unit has a plurality of path-switch-input-terminals that are each couplable to a receive-antenna. The redirect-switching-unit has a plurality of redirect-switch-output-terminals that are each associated with one of the plurality of path-switch-input-terminals in order to define a plurality of switch-terminal-pairs. The receive-paths are connected between a path-switch-output-terminal and a redirect-switch-input-terminal. The path-switching-unit and the redirect-switching-unit are configured to selectively connect each receive-path between different ones of the plurality of switch-terminal-pairs, based on a switch-control-signal. The processor can receive first-processor-input-signals from a first configuration of the plurality of receive paths selectively connected between the plurality of switch-terminal-pairs; receive further-processor-input-signals from one or more further configurations of the plurality of receive-paths selectively connected between the plurality of switch-terminal-pairs; and determine an angle-of-arrival associated with the input-signals based on the first-processor-input-signals and further-processor-input-signals.

A multi-port antenna and associated systems having extremely wide bandwidth and capable of maintaining directivity as frequency decreases and is made arbitrarily low, allowing DF systems to operate to arbitrarily low frequency regardless of size. Construction may be rugged, lightweight, and low cost, allowing reliable service in harsh environments. The systems allow utilization of both the E and H fields occupying a common area of space. The disclosed DF system takes advantage of knowledge of the as-installed array manifold, uses pattern matching to determine the angle of arrival (AoA) of incoming waves, and enhances sensitivity by using integration on cross-correlation products between the multiple ports to achieve SNR improvement.

A system and method of determining the angle of arrival or departure using a neural network is disclosed. The system collects a plurality of I and Q samples as a packet containing a constant tone extension is being received. The I and Q samples are used to form I and Q arrays, which are used as the input to the neural network. The neural network produces a first output representative of the azimuth angle and a second output representative of the elevation angle. In certain embodiments, the neural network is capable of detecting a plurality of angles, where, for each angle, there are three outputs, a first output representative of the azimuth angle, a second output representative of the elevation angle and a third output representative of the relative amplitude. In some embodiments, the neural network is configured to determine the carrier frequency offset of an incoming signal as well.

A modular, radio frequency (RF) system includes one or more directional antennas and is configured with both hardware and software components to enable the RF system to monitor (e.g., detect or track signals or objects) and/or interact with (e.g., track signals or objects, or transmit signals) objects in particular directions. The RF system includes one or more machine learning models to determine, based on received signals, one or more signals to transmit.

The invention relates to the method for determining the direction of arrival of radio signals in the presence of aliasing, the method using an interferometric array (12) with four antennas (16) with identical diagrams, and sampling by two distinct sampling frequencies per antenna (16), the method also comprising, for all of the detected wanted signals: the determination of the interference situation for each antenna (16), for the antennas (16) other than the antenna (16) affected by the double interference, the phase of the wanted signal, and for any antenna (16) affected by the double interference, the estimate of the phase of the wanted signal.

The present disclosure provides a computer implemented method of providing an indicator useful for piloting an aircraft. The aircraft comprises an antenna configured to communicate with a transceiver. The method comprises: obtaining an antenna envelope characterizing directions relative to the aircraft for which a directive gain of the antenna exceeds a predetermined threshold; determining a direction of the transceiver relative to the aircraft; calculating a maneuvering range of the aircraft by comparing the antenna envelope and the transceiver direction, wherein the maneuvering range is indicative of eligible orientations of the aircraft for maintaining the transceiver within the antenna envelope; and outputting data indicative of the maneuvering range.

Devices and methods of estimating the AoD of a STA are generally described. The STA receives comparison symbols from a first AP antenna. The comparison symbols are received prior to and after switching of transmitter chains from a first set of antennas to a second set of antennas. AoD symbols are received immediately after the comparison symbols. A phase and amplitude correction is determined based on a phase and amplitude change between the comparison symbols and the second AoD symbol corrected based thereon. The AoD is subsequently estimated based on the symbol measurements.

A positioning sensor includes m receiving antennas connected to a feeder circuit and n variable loads, and a receiver that receives a first signal via the m receiving antennas. The positioning sensor further includes a memory that stores a first signal strength value of a first signal that the receiver receives when a variable load varies in value, and a processor that calculates a second signal strength value from a complex propagation channel, searches for a complex propagation channel candidate that has a minimum difference between a first signal strength and a second signal strength, determines the complex propagation channel candidate to be a complex propagation channel when the receiver receives the first signal, and estimates an incoming direction of the first signal from the determined complex propagation channel.