A system and method for detecting individuals in a target geographic location, such as a disastrous site, that identifies and locates potential victims using signals from the victims' cell phone utilizes an unmanned aerial vehicle controlled equipped with a retractable antenna component and a core network connection component. The retractable antenna component includes a mobile telephony base station and employs a smart antenna system so as to estimate the direction of arrival of all incoming signals. The core network connection component is operative to establish a wireless communication link with an Internet Protocol based core network of. When a victim's cell phones attempts to connect to the base station in order to access the core network, the location of the cell phone can be determined. The locations can be plotted on a map and based on the distribution of phones on the map, rescue efforts can be optimized.

Provided are a robot accompaniment device and a four-legged robot (1) using the same. The robot accompaniment device includes a target module provided with an orienting assembly (3). The orienting assembly (3) is provided with a dual-antenna structure, and implements positioning and orienting between the accompanier and the accompanied, thus enabling a robot to be capable of recognizing the position, orientation and turning angle of an accompaniment object (2) relative to the robot, and moving and turning together with the accompaniment object (2).

Provided are a robot accompaniment device and a four-legged robot (1) using the same. The robot accompaniment device includes a target module provided with an orienting assembly (3). The orienting assembly (3) is provided with a dual-antenna structure, and implements positioning and orienting between the accompanier and the accompanied, thus enabling a robot to be capable of recognizing the position, orientation and turning angle of an accompaniment object (2) relative to the robot, and moving and turning together with the accompaniment object (2).

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 communication relay apparatus of an embodiment includes an antenna, a signal intensity detector, a first search unit, and a second search unit. The antenna forms a beam of radio waves in an arbitrary direction. The signal intensity detector detects an intensity of a signal received by the antenna. The first search unit changes a direction of the beam formed by the antenna within a first range, and detects a direction in which the mobile station is located based on the intensity of the signal detected by the signal intensity detector. The second search unit changes a direction of the beam formed by the antenna within a second range narrower than the first range, and detects a direction in which the mobile station is located based on the intensity of the signal detected by the signal intensity detector.

A communication relay apparatus of an embodiment includes an antenna, a signal intensity detector, a first search unit, and a second search unit. The antenna forms a beam of radio waves in an arbitrary direction. The signal intensity detector detects an intensity of a signal received by the antenna. The first search unit changes a direction of the beam formed by the antenna within a first range, and detects a direction in which the mobile station is located based on the intensity of the signal detected by the signal intensity detector. The second search unit changes a direction of the beam formed by the antenna within a second range narrower than the first range, and detects a direction in which the mobile station is located based on the intensity of the signal detected by the signal intensity detector.

The present invention relates to a directional antenna module comprising: at least one antenna array having at least two antenna elements connected to a 180-degree hybrid providing an inphase summation signal and an out-of-phase summation signal of the antenna signals received from the antenna elements and a switching element adapted to switch between the inphase summation signal and the out-of-phase summation signal output by said 180-degree hybrid in response to a direction finding mode control signal (DFM-CRTL) to provide an antenna output signal at an antenna module output of said directional antenna module. The present invention further relates to a method for direction finding of a signal source.

An RFID tag reading system and method estimate bearings of RFID tags. When the RSSI of a primary and/or secondary RFID receive signal is below a threshold, a primary receive beam is steered in a limited scan to an array of locations distributed around the location at which the RSSI of the primary receive signal is a maximum, and the RSSI of the primary receive signal is recorded at each location. The recorded RSSIs are processed to determine an effective weighted center of distribution of the recorded RSSIs, and the bearing for the tag based on the weighted center of distribution is thus estimated.

Systems and methods are provided for a digital beamformed phased array feed. The system may include a radome configured to allow electromagnetic waves to propagate; a multi-band software defined antenna array tile; a power and clock management subsystem configured to manage power and time of operation; a thermal management subsystem configured to dissipate heat generated by the multi-band software defined antenna array tile; and an enclosure assembly. The multi-band software defined antenna array tile may include a plurality of coupled dipole array antenna elements; a plurality of frequency converters; and a plurality of digital beamformers.

Systems and methods are provided for a digital beamformed phased array feed. The system may include a radome configured to allow electromagnetic waves to propagate; a multi-band software defined antenna array tile; a power and clock management subsystem configured to manage power and time of operation; a thermal management subsystem configured to dissipate heat generated by the multi-band software defined antenna array tile; and an enclosure assembly. The multi-band software defined antenna array tile may include a plurality of coupled dipole array antenna elements; a plurality of frequency converters; and a plurality of digital beamformers.