摘要:
A mobile receiver for satellite broadcast comprises a directive antennas (3), a navigation unit (5) for generating a navigation signal representing a position and an attitude of an aeroplane, a control unit (7) for generating a control signal for controlling the antennas, on the basis of the navigation signal from the navigation unit (5) and prestored information indicating a position of a broadcasting satellite, and a drive unit (9) for driving the antennas in response to the antenna control signal from the control unit to orient the directivity of the antenna toward the broadcasting satellite.
摘要:
A terminal for a communications network assembly comprises an antenna (22) which is operable in a first mode as a scanning antenna to scan electrically or mechanically and thereby determine a communications link with a selected one of a plurality of base stations, and in a second mode is operable as a communications antenna to communicate with the selected one of the plurality of base stations. Control means are provided which are operable to receive data from the antenna when operating in a scanning mode, to determine which base station should be used for future data communication, and can move the orientation of the antenna such that it is operable to communicate with the selected one of the base stations. Separate scanning and communication antennas may be provided.
摘要:
A direction adjusting display utilized when the direction of a satellite signal receiving antenna is adjusted. The direction of an antenna is determined watching the display on a display so that the antenna receives the strongest signals irrespective of the level of the satellite signal reaching the ground. At the same time the range of direction in which the antenna receives signals in a good condition is found on the basis of what is displayed on the display. The direction adjusting display generates a judgement reference level lower by a predetermined level than the peak level of the signal received by the antenna. The display judges the level of the received signal using the judgement reference level, and displays the result of judgement thereon.
摘要:
Apparatus and method of setting the upstand height of the studs (5) of an array (1) of studs used to form antenna panels is disclosed. The apparatus includes a transducer beam (10) having a row of spaced apart distance transducers (12). The apparatus also includes an actuator beam (22) having a row of spaced rotary actuators (26). The actuators (26) rotate the threaded studs (5) to raise or lower same until the corresponding transducer (12) indicates that the stud has achieved an intended height. Also disclosed is a method using an array of laser diodes (60), rather than the transducer beam (10), arranged at one end of the base plate (2) and an array of photodiodes (62) at the opposite end. Output (63) of the diodes (62) indicates the height of the studs (5).
摘要:
L'invention est fondée sur les études de la Demanderesse qui a montré que la puissance fournie par les moteurs entraînant le système en rotation était fonction de ces efforts. Une mesure de la puissance, ou de toute grandeur caractéristique de cette puissance (courant, cosφ, pression...) permet donc de mesurer simplement les efforts liés au vent. Si l'on se fixe une valeur de puissance (ou de grandeur caractéristique) limite liée à la vitesse limite du vent au-delà de laquelle les forces subies par le système sont trop importantes, on obtient facilement, moyennant une comparaison, une condition sur le fonctionnement des moteurs. L'invention permet également, pour des systèmes tournants effectuant une mesure d'angle, de faire une correction sur cette mesure.
摘要:
A motor (1) for driving the antenna (3) is connected to a source of power (5) for providing current for driving the motor. The source of power is connected to the motor by a pair of conductors and a voltage is developed across the pair of conductors. The system includes an arrangement for measuring and controlling the speed of the motor and therefore the antenna which includes a current interruption facility (7) for interrupting the current during a current interruption period. The current interruption period is adjustable whereby to adjust the speed of the motor (1) and thereby the antenna (3). The voltage developed across the pair of conductors is measured during the current interruption period. The voltage measured during the current interruption period is proportional to the speed of the antenna.
摘要:
AAn arrangement for the automatic orientation of an antenna (20) in a radio receiver or television set comprises a telecontrol transmitter (1) and a circuitry inside the apparatus consisting of a receiver (6) for the signals emitted by the telecontrol (1), a register (14) and a digitallanalog converter (16) which supplies a variable voltage to each value of which an angular position of the antenna (20) can be associated. The signals emitted by the telecontrol (1) can be stored in a memory (13) incorporated in the apparatus and the information relating to an angular position of the antenna can be associated, in the case of a key controlled television set or radio receiver, each to an individual channel.