A radio wave arrival direction estimation device according to an embodiment includes an antenna angle acquisition unit that acquires each of antenna angles indicating a plurality of different directions in which antennas having non-uniform antenna patterns are sequentially directed, a reception intensity measurement unit that measures reception intensities at which the antenna has received a radio wave at each of the antenna angles acquired by the antenna angle acquisition unit, a matching degree Calculation unit that calculates a matching degree between the antenna angle acquired by the antenna angle acquisition unit and the reception intensity measured by the reception intensity measurement unit, and an antenna pattern of the antenna for each antenna angle acquired by the antenna angle acquisition unit, and an estimation unit that estimates an antenna angle at which the matching degree Calculated by the matching degree Calculation unit is the maximum as an arrival direction of the radio wave.

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.

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.

There is provided mechanisms for determining an electrical phase relation between antenna elements in an antenna array. A method is performed by a radio transceiver device. The method comprises obtaining measurements of the radio signal as received in two receive beams covering a given angular sector. The receive beams have different complex beam patterns. The method comprises estimating the angle of arrival of the radio signal for at least one polarization port of each of the receive beams using the measurements in the two receive beams. The method comprises determining, from the angle of arrival estimated for each polarization port, an electrical phase relation between antenna elements in the antenna array that corresponds to the estimated angle of arrival.

There is provided mechanisms for determining an electrical phase relation between antenna elements in an antenna array. A method is performed by a radio transceiver device. The method comprises obtaining measurements of the radio signal as received in two receive beams covering a given angular sector. The receive beams have different complex beam patterns. The method comprises estimating the angle of arrival of the radio signal for at least one polarization port of each of the receive beams using the measurements in the two receive beams. The method comprises determining, from the angle of arrival estimated for each polarization port, an electrical phase relation between antenna elements in the antenna array that corresponds to the estimated angle of arrival.

There is provided mechanisms for estimating angle of arrival of a radio signal in a radio communications network. A method is performed by a receiving radio transceiver device. The method comprises obtaining measurements of the radio signal as received in two receive beams covering a given angular sector. The two receive beams are created by analog beamforming in an antenna array. The receive beams have different complex beam patterns and at any angle within the given angular sector at most one of the complex beam patterns has gain below a threshold. The method comprises estimating the angle of arrival of the radio signal by comparing a complex amplitude of the measurements in the two receive beams to a discriminator function.

There is provided mechanisms for estimating angle of arrival of a radio signal in a radio communications network. A method is performed by a receiving radio transceiver device. The method comprises obtaining measurements of the radio signal as received in two receive beams covering a given angular sector. The two receive beams are created by analog beamforming in an antenna array. The receive beams have different complex beam patterns and at any angle within the given angular sector at most one of the complex beam patterns has gain below a threshold. The method comprises estimating the angle of arrival of the radio signal by comparing a complex amplitude of the measurements in the two receive beams to a discriminator function.

An anticipated direction to a signal source is determined by a communication device having an antenna. The communication device receives video images in a field of view of a camera and determines, using sensors of the communication device, an antenna direction. The antenna direction is the direction that the antenna of the communication device is pointing. The communication device displays, using a display screen, the video images, an antenna direction indicator, and a guiding icon. The antenna direction indicator indicates the antenna direction relative to the field of view of the camera, and the guiding icon represents a direction offset from the anticipated direction. An energy value of a signal received from the signals source is determined by the communication device using the antenna, and a position of the guiding icon on the display screen is updated based on the anticipated direction.

An anticipated direction to a signal source is determined by a communication device having an antenna. The communication device receives video images in a field of view of a camera and determines, using sensors of the communication device, an antenna direction. The antenna direction is the direction that the antenna of the communication device is pointing. The communication device displays, using a display screen, the video images, an antenna direction indicator, and a guiding icon. The antenna direction indicator indicates the antenna direction relative to the field of view of the camera, and the guiding icon represents a direction offset from the anticipated direction. An energy value of a signal received from the signals source is determined by the communication device using the antenna, and a position of the guiding icon on the display screen is updated based on the anticipated direction.

A communication device, having an antenna, determines a direction substantially in a direction to an intended transceiver. A desired direction that is different from the direction to the intended transceiver, and an anticipated direction that is offset from the desired direction, are determined. Based on the desired direction, parameters of expected energy values corresponding to a multiple pre-defined antenna directions of the antenna around the desired direction are determined. The communication device receives, using the antenna, multiple measured energy values corresponding to multiple antenna directions of the antenna around the anticipated direction. A directional offset is calculated using the multiple expected energy parameters and the multiple measured energy values. An updated anticipated direction is generated by updating the anticipated direction using the calculated directional offset. Steps of receiving measured energy values through generating an updated anticipated direction are repeated using the updated anticipated direction as the anticipated direction.