×

High-sensitivity satellite positioning system receivers and reception methods

  • US 6,683,564 B1
  • Filed: 11/19/2002
  • Issued: 01/27/2004
  • Est. Priority Date: 11/19/2002
  • Status: Active Grant
First Claim
Patent Images

1. A method for operating a navigation receiver, the method comprising the steps of:

  • categorizing a position uncertainty (sigmaPos) of a navigation satellite receiver into a category-A where there is no integer ambiguity problem to solve, a category-B where a useful Doppler estimate can be applied, and a category-C where the position is so uncertain that an initial Doppler estimate of zero produces a quicker position solution result;

    obtaining satellite vehicle (SV) ephemeris, almanac, and system time information other than directly from an orbiting SV according to which of said three categories A-C said sigmaPos is assumed to fit; and

    acquiring a microwave signal transmissions directly from said orbiting SV according to which of said three categories A-C said sigmaPos is assumed to fit.

View all claims
  • 7 Assignments
Timeline View
Assignment View
    ×
    ×