A communication system according to one embodiment comprises: a communication device including a tracking unit which rotates with respect to a first axis, a second axis, and a third axis that are orthogonal to each other and which performs radio-wave communication with a moving object moving within the field of view; and a controller for controlling the communication device so that the tracking unit rotates with respect to the first axis and the second axis in the range of a first trajectory angle of the moving body and rotates with respect to the second axis and the third axis in the range of a second trajectory angle of the moving object.

A calibrated measurement of the angular misalignment x of a radiofrequency antenna pointing towards a slow mobile, radio transmitter along an antenna axis, the antenna being in radio communication with the mobile. The measurement includes receiving of radiofrequency signals derived from the mobile during a period of the applied path, the signal being received on a frequency band lower than or equal to the frequency of the transmitted signal; determining, on a logarithmic scale, of the instantaneous power of the received signal; harmonic decomposition over each period of the power thus determined into a fundamental component and at least one harmonic component; and estimating of the angular misalignment x from the ratio between the fundamental term and a harmonic component.

A calibrated measurement of the angular misalignment x of a radiofrequency antenna pointing towards a slow mobile, radio transmitter along an antenna axis, the antenna being in radio communication with the mobile. The measurement includes receiving of radiofrequency signals derived from the mobile during a period of the applied path, the signal being received on a frequency band lower than or equal to the frequency of the transmitted signal; determining, on a logarithmic scale, of the instantaneous power of the received signal; harmonic decomposition over each period of the power thus determined into a fundamental component and at least one harmonic component; and estimating of the angular misalignment x from the ratio between the fundamental term and a harmonic component.

A feed array for reflector antennas is provided that may be installed in a reflector antenna provided with a single or dual reflector optics and that includes: a radiating array arranged in a focal region of the single/dual reflector optics and operable to transmit and receive radiofrequency signals; digital beam forming means; reception conversion means connected between the radiating array and the digital beam forming means and designed to apply a frequency down-conversion and an analog-to-digital conversion to incoming radiofrequency signals received by the radiating array thereby obtaining incoming digital signals, and provide the digital beam forming means with the incoming digital signals; and transmission conversion means connected between the radiating array and the digital beam forming means and designed to apply a digital-to-analog conversion and a frequency up-conversion to outgoing digital signals generated by the digital beam forming means thereby obtaining outgoing radiofrequency signals, and provide the radiating array with the outgoing radiofrequency signals to be transmitted by said radiating array.

A feed array for reflector antennas is provided that may be installed in a reflector antenna provided with a single or dual reflector optics and that includes: a radiating array arranged in a focal region of the single/dual reflector optics and operable to transmit and receive radiofrequency signals; digital beam forming means; reception conversion means connected between the radiating array and the digital beam forming means and designed to apply a frequency down-conversion and an analog-to-digital conversion to incoming radiofrequency signals received by the radiating array thereby obtaining incoming digital signals, and provide the digital beam forming means with the incoming digital signals; and transmission conversion means connected between the radiating array and the digital beam forming means and designed to apply a digital-to-analog conversion and a frequency up-conversion to outgoing digital signals generated by the digital beam forming means thereby obtaining outgoing radiofrequency signals, and provide the radiating array with the outgoing radiofrequency signals to be transmitted by said radiating array.

Technologies directed to a mechanically steered antenna with improved efficiency are described. One antenna includes a first reflector, a second reflector, and an antenna feed element. The second reflector is located on a reflecting side of the first reflector. The second reflector is offset from the first reflector. The second reflector receives an electromagnetic signal from the antenna feed element and outputs an inverted electromagnetic signal corresponding to the electromagnetic signal. The first reflector receives the inverted electromagnetic signal and outputs a collimated beam corresponding to the inverted electromagnetic signal. The antenna further includes a mechanism coupled to the first reflector. The mechanism rotates the first reflector about a first axis. The first axis is along a direction of the inverted electromagnetic signal.

Technologies directed to a mechanically steered antenna with improved efficiency are described. One antenna includes a first reflector, a second reflector, and an antenna feed element. The second reflector is located on a reflecting side of the first reflector. The second reflector is offset from the first reflector. The second reflector receives an electromagnetic signal from the antenna feed element and outputs an inverted electromagnetic signal corresponding to the electromagnetic signal. The first reflector receives the inverted electromagnetic signal and outputs a collimated beam corresponding to the inverted electromagnetic signal. The antenna further includes a mechanism coupled to the first reflector. The mechanism rotates the first reflector about a first axis. The first axis is along a direction of the inverted electromagnetic signal.

Trapped or confined individuals may be located and rescued by detecting their vital signs (e.g., chest movement or heart beat) using reflected, radio frequency signals over a range of multiple antenna polarities.

Trapped or confined individuals may be located and rescued by detecting their vital signs (e.g., chest movement or heart beat) using reflected, radio frequency signals over a range of multiple antenna polarities.

Systems and methods for detecting and reducing signal interference affecting wireless communication with a mobile vehicle includes generating an interference signature based on a correlation multiple signal-quality characteristics of a desired target-signal that is received at an antenna assembly attached to the mobile vehicle, and adjusting the orientation of the antenna assembly based on a change or degradation in the interference signature to thereby improve wireless communication with the vehicle.