Abstract: The antenna system comprises a reflector which can be motionless, a source device and a device for treating the signals received by the source device. The system comprises means for automatically tracking the satellite that deviates from its initial position to an inclined orbital path.
Abstract: In the device:
at least one set of links sends packet formated digital information to the satellite, on at least two different frequencies;
at least one satellite-borne module receives, multiplexes and re-formates the information on only one downlink;
at least one of the links works in a Time Division Multiple Access (TDMA) mode.
Type:
Grant
Filed:
September 17, 1997
Date of Patent:
October 29, 2002
Assignees:
Organisation Europeenne de Telecommunications par Satellite
Eutelsat, Agence Spatiale Europeenne
Inventors:
Huu Nghia Pham, Carlo Elia, Maria Gouta
Abstract: The invention concerns a frequency converter arrangement for parabolic antennae receiving vertical and horizontal linear polarization signals, transmitted by two geostationary satellites not far from each other. The arrangement comprises two positive converter devices (5, 6) designed to receive the signal derived from a satellite, each device bearing means ensuring that the receiving antennae elements are oriented in the received signal plane and means to adapt to the different elevations of the two satellites, by rotating the converter device support. The arrangement is characterized in that the output portions (10) of the two converter devices (5, 6) are made in the form of a single-piece part (12) whereas the input portions (9) are separated and mounted selectively adjustable on the single-piece part (12), the arrangement being mounted rotating about an axis parallel to the two input portions (9).
Type:
Grant
Filed:
April 19, 2000
Date of Patent:
February 5, 2002
Assignee:
Organisation Europenne de Telecommunications par Satellite
Eutelsat
Abstract: The device comprises at least one set of links that send packet formatted digital information to the satellite on at least two different frequencies, at least one second set of links on board the satellite receives the digital information packets, at least one packet time multiplexing module connected both to output of the second set of links and to input of a digital information formatting module comprising a scrambler connected to input of a part of a broadcasting DVB-S chain beginning by a convolutive interleaving block and terminating by a QPSK modulator, at least one clock on board the satellite, this clock, working in asynchronism with all earth clocks and driving the satellite-borne assembly.
Type:
Grant
Filed:
September 17, 1997
Date of Patent:
October 17, 2000
Assignees:
Organisation Europeenne de Telecommunications par Satellite Eutelsat, Agence Spatiale Europeenne