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Efficient high latitude service area satellite mobile broadcasting systems

  • US 6,564,053 B1
  • Filed: 10/19/2000
  • Issued: 05/13/2003
  • Est. Priority Date: 05/20/1998
  • Status: Expired due to Term
First Claim
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1. A method of providing satellite broadcasts to mobile receivers at or near the surface of the earth in a targeted geographical service area that is, at least in part, in a latitude above about 30°

  • N or in a latitude below about 30°

    S, comprising;

    providing a constellation of two or more satellites with each satellite (1) during a part of its orbit, having elevation angles of at least about 35°

    in at least a part of said targeted geographic service area;

    (2) having an orbit with a periodicity substantially the same as the period of rotation of the earth on its axis;

    broadcasting from a satellite source in said constellation at an elevation angle or angles greater than or equal to approximately 35°

    , on one path, a signal having a frequency in the range of about 1 to 4 GHz that includes audio program information;

    substantially simultaneously broadcasting from another satellite source in said constellation at an elevation angle or angles greater than or equal to approximately 35°

    , on a different path, another signal having a frequency in the range of about 1 to 4 GHz that includes substantially the same audio program information; and

    providing a time delay between said signals, said time delay being of sufficient length to reduce outages in substantial parts of said service area;

    and assembling and producing an output signal comprising audio program information derived from said satellite broadcast signals at a plurality of mobile receivers located in said service area.

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