Abstract:
A rotation determiner (23) determines whether the azimuth (AZ) angle of an antenna (3) rotates beyond a rotation range within a predetermined duration of time on the basis of a predicted orbit value. When the AZ angle of the antenna (3) is determined to rotate beyond the rotation range, an orbit determiner (24) determines whether an estimated satellite position is within a drivable range in which the AZ angle rotates from a reference value beyond the rotation range, and in which an xEL axis can be driven in a state in which the AZ angle is set to a predetermined value that is permissible for the AZ angle. When the AZ angle rotates beyond the rotation range and while the estimated satellite position is within the drivable range, a determiner (22) sends a command to a switching section (17) to cause three-axis control, and a command to cause an AZ command operator (15) to output a command value that keeps the AZ angle at a predetermined value. When the AZ angle rotates beyond the rotation range and while the estimated satellite position is not within the drivable range, or when the AZ angle does not rotate beyond the rotation range, the determiner (22) sends a command to the switching section (17) to cause two-axis control.
Abstract:
Systems for maintain pointing of a phased array antenna in a direction maximizes to an extent possible the effective antenna gain is provided. The system includes a gyroscope and a Kalman Filter. The Kalman filter estimates an antenna pointing direction for each successive time step based on gyroscope readings and based on the results of a local search for maximum gain performed in the neighborhood of a previous antenna pointing direction.
Abstract:
Disclosed is a hybrid antenna array (100) comprising a plurality of digital branches (145), each digital branch including an analogue beamforming sub-array (e.g. 110-1), each sub-array having a plurality of antenna elements (120), a phase shifter (130) adapted to apply a phase shift to the signal from each antenna element, and a combiner (e.g. 135-1) adapted to combine the phase-shifted signals. Each digital branch also includes a signal chain (e.g. 140-1) adapted to convert the output of the sub-array to baseband. The hybrid antenna array also comprises a digital processing module (150), including: an angle of arrival estimation sub-module (155) adapted to estimate an angle of arrival of a signal at the antenna elements; a phase control sub-module (170) adapted to control the phase shift applied by each phase shifter depending on the estimated angle of arrival; and a digital beamformer (165) adapted to combine the baseband signals from the digital branches using a weight vector to form an output signal (180).
Abstract:
Disclosed is a hybrid antenna array (100) comprising a plurality of digital branches (145), each digital branch including an analogue beamforming sub-array (e.g. 110-1), each sub- array having a plurality of antenna elements (120), a phase shifter (130) adapted to apply a phase shift to the signal from each antenna element, and a combiner (e.g. 135-1) adapted to combine the phase-shifted signals. Each digital branch also includes a signal chain (e.g.140-1) adapted to convert the output of the sub-array to baseband. The hybrid antenna array also comprises a digital processing module (150), including: an angle of arrival estimation sub-module (155) adapted to estimate an angle of arrival of a signal at the antenna elements; a phase control sub-module (170) adapted to control the phase shift applied by each phase shifter depending on the estimated angle of arrival; and a digital beamformer (165) adapted to combine the baseband signals from the digital branches using a weight vector to form an output signal (180).
Abstract:
A satellite connection apparatus (1) is provided for transport means (11) comprising: an antenna (2) of geostabilized type, suitable to track a first satellite (10) in coverage and of establishing a connection with said first satellite (10), a modem (3) capable of rendering the signal received by said antenna (2) usable by computers and the like, a position detection device (5) capable of determining the position of said transport means (11) on the globe and automatic actuator means capable of moving said antenna (2), wherein the antenna (2) is capable of automatically tracking a different satellite (10) in coverage, when the first satellite (10) is no longer in coverage following movements of the transport means.
Abstract:
A method of reading information from a transmitter (70) using a phased array antenna (76) where the angle of incidence of a reflected signal (80) is detected and the phased array antenna (76) is adjusted to receive that signal (80) accordingly. A method for simultaneously detecting a plurality of radio frequency signals incident on a phased array antenna, and associated phased array control apparatus. Several embodiments provide methods for allowing the acquisition, tracking and reception of frequency modulated video signals transmitted by a mobile television radio-camera in a multipath environment.