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GNSS post positioning with elongated dither sequence

  • US 8,358,242 B2
  • Filed: 11/18/2008
  • Issued: 01/22/2013
  • Est. Priority Date: 05/26/2005
  • Status: Active Grant
First Claim
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1. A computer apparatus for post positioning with a selected precision, comprising:

  • a global navigation satellite system (GNSS) post processor to post process reference GNSS carrier phases from a reference system and rover GNSS carrier phases from a rover receiver to compute a secure position for said rover receiver, said secure position not available to a user;

    a random process generator to generate a sequence of offset vectors to dither said secure position according to a computed dither level to provide said selected precision for a user-available position for said rover receiver;

    a seed generator to associate a seed with a particular data set of said rover carrier phases; and

    wherein;

    the random process generator is constructed to use said seed to generate the same said sequence of said offset vectors each time said sequence of said offset vectors is generated for said particular data set.

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