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Common direct broadcasting service system

  • US 5,978,652 A
  • Filed: 01/10/1997
  • Issued: 11/02/1999
  • Est. Priority Date: 01/10/1997
  • Status: Expired due to Fees
First Claim
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1. A Common Direct Broadcasting Service (CDBS) system for a communications spacecraft, the CDBS system comprising:

  • N uplink antennas, each of said N uplink antennas for receiving uplinks from terrestrial transmitting stations, each of said uplinks including at least one of left-hand circular polarized (LHCP) signals and right-hand circular polarized (RHCP) signals, individual ones of said LHCP signals and said RHCP signals having frequencies within predetermined channels of at least one of a first predefined frequency band and a second predefined frequency band;

    means for separating the LHCP signals of the uplinks received by each of said N uplink antennas from the RHCP signals of the uplinks received by each of said N uplink antennas;

    means for converting the separated LHCP signals and RHCP signals of the uplinks received by each of said N uplink antennas to first signals and second signals, respectively, of the uplinks, said first and second signals having frequencies within channels of at least one of a third predefined frequency band and a fourth predefined frequency band;

    means for selecting a predetermined number of the first signals and second signals of the uplinks;

    means for down-selecting signals of the predetermined number of the first and second signals having frequencies within selected ones of the channels of the at least one of the third and fourth predefined frequency bands;

    means for amplifying signals down-selected by said down-selecting means and for outputting resultant amplified signals; and

    a plurality of downlink antennas for downlinking signals output by said amplifying means from the communications spacecraft to selected ones of the plurality of terrestrial receiving stations.

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