Abstract: Method for compensating the drift of a gyro mounted on a vessel subjected to at least rotational motions, about horizontal axes centered around an equilibrium position, and vertical translational motions, which vessel includes a three-axial accelerometer for measuring the acceleration of the vessel along three directions, includes low pass filtering the output signal from the gyro, calculating an inclination signal based upon the measurement values of the accelerometer and low pass filtering it, compensating the output signal from the gyro based upon the difference between the two low pass filtered signals, selecting the cut-off frequency of the low pass filtration of the inclination signal so that it is larger than a typical oscillation frequency for the translational motions but smaller than a typical oscillation frequency for the rotational motions, calculating a total force vector from the three measurement values, and calculating the inclination signal based upon the total force vector.

Abstract: A method for compensating the drift of an element for position measurement mounted on an object, including at least one gyro for measuring rotation of the object about an axis and at least one accelerometer for measuring two mutually perpendicular components of the acceleration of gravity as a consequence of the orientation of the object relative to the acceleration of gravity along two mutually perpendicular directions, which together correspond to the rotation of the object about the axis. The output signal from the accelerometer and the output signal from the gyro are low-pass filtered. These two signals are compared and the output signal from the gyro is compensated using an output signal from the accelerometer so that the deviation of the output signal of the gyro because of drift is decreased or eliminated. The thus produced, compensated signal constitutes an output signal from the gyro.

Abstract: Method for obtaining a predetermined position for a satellite antenna, whereby a controller (9) is made to transfer information to a velocity controller (3), in turn being made to transfer information to a current regulator (4), being made to transfer current to a motor which is intended for setting the desired position of the satellite antenna. The electrical motor (5) is made to receive current from the current regulator so that the electrical motor is made to turn a predetermined angle during a predetermined time interval. An angle sensor (6) is positioned on the satellite antenna and is made to read an absolute angle or an angular displacement of the satellite antenna, and the angle sensor is connected to the controller so as to create a feedback loop. An automatic control system is also disclosed.

Abstract: Method for compensating the drift of an element for position measurement mounted on an object, such as a ship or another vehicle, including at least one gyro for measuring rotation of the object about an axis and at least one accelerometer for measuring two mutually perpendicular components of the acceleration of gravity as a consequence of the orientation of the object relative to the acceleration of gravity along two mutually perpendicular directions, which together correspond to the rotation of the object about the axis. The output signal from the accelerometer and the output signal from the gyro are low-pass filtered. These two signals are compared and the output signal from the gyro is compensated using an output signal from the accelerometer so that the deviation of the output signal of the gyro because of drift is decreased or eliminated. The thus produced, compensated signal constitutes an output signal from the gyro.

Abstract: Method for obtaining a predetermined position for a satellite antenna, whereby a controller (9) is made to transfer information to a velocity controller (3), in turn being made to transfer information to a current regulator (4), being made to transfer current to a motor which is intended for setting the desired position of the satellite antenna. The electrical motor (5) is made to receive current from the current regulator so that the electrical motor is made to turn a predetermined angle during a predetermined time interval. An angle sensor (6) is positioned on the satellite antenna and is made to read an absolute angle or an angular displacement of the satellite antenna, and the angle sensor is connected to the controller so as to create a feedback loop. An automatic control system is also disclosed.

Abstract: An antenna arrangement includes an antenna reflector (10), a transceiver element (11) and a signal detection unit (12) having a signal converter (121-122) and a computing unit (123) for generating in response to incoming signals control signals for controlling the alignment of the antenna reflector (10) with a target object. The signal converter (121-122) is adapted to reduce its bandwidth automatically and incrementally from a requisite maximum frequency range to a narrow band frequency range. Changes in the direction of the antenna reflector are detected through the medium of a movement detection unit (13) that includes 3d-sensors (131, 132, 133). Mechanical control of the alignment direction of the antenna reflector (10) is effected with the aid of a drive unit (15).

Abstract: A feeder horn intended particularly for two-way satellite communications equipment and including a central transceiver horn (10) and at least three separate measuring horns (11, 12, 13) placed symmetrically in relation to the feeder horn symmetry line (O), wherein all horns are produced mechanically in one and the same metal element (1) which includes a through-penetrating center opening (100) for the transceiver horn (10), a bottom-delimited opening (110, 130, 140) for each of the measuring horns (11, 12, 13), and a moat-like recess (104, 114, 124, 134) in the metal element (1) around each opening (100, 110, 120, 130) for insulating each horn electromagnetically in relation to other horns. The delimited opening (110, 120, 130) for each of the measuring horns in the metal element (1) is filled with dielectric material (1101, 1201, 1301).