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Method for increasing the availability of a global navigation system

  • US 8,094,069 B2
  • Filed: 02/01/2008
  • Issued: 01/10/2012
  • Est. Priority Date: 02/06/2007
  • Status: Expired due to Fees
First Claim
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1. A process for increasing the availability of a global navigation system comprising a plurality of spacecraft, each of which transmits information for determining the position of a terminal, said method comprising:

  • each of said spacecraft transmitting information to the terminal;

    from the plurality of spacecraft, determining a first subset including at least one of said spacecraft, and a second subset, with the second subset being constituted by those spacecraft that are not included in the first subset; and

    determining an integrity risk exclusively for the information transmitted by the second subset of spacecraft;

    wherein, the first and the second subsets of spacecraft are determined such that the integrity risk determined for the information transmitted by the second subset of spacecraft is optimized relative to the integrity risk that was determined for the information of all spacecraft included in the plurality of spacecraft.

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