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Systems and methods for inter-system sharing of satellite communications frequencies within a common footprint

  • US 7,925,209 B2
  • Filed: 07/14/2006
  • Issued: 04/12/2011
  • Est. Priority Date: 09/11/2003
  • Status: Active Grant
First Claim
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1. A frequency sharing system comprising:

  • a first satellite that communicates with first radioterminals using frequencies of a frequency band in a first service region; and

    a second satellite that communicates with second radioterminals using frequencies of the frequency band in a second service region that is contained within the first service region,wherein an antenna gain of the second satellite is greater than an antenna gain of the first satellite, the first satellite communicates with the first radioterminals by transmitting and receiving substantially Right Hand Circularly Polarized (RHCP) electro-magnetic energy, the second satellite communicates with the second radioterminals by transmitting substantially Left Hand Circularly Polarized (LHCP) electro-magnetic energy and at least one of the second radioterminals communicates with the second satellite by transmitting substantially linearly polarized electro-magnetic energy.

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