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GPS correction methods, apparatus and signals

  • US 6,862,526 B2
  • Filed: 04/07/2004
  • Issued: 03/01/2005
  • Est. Priority Date: 12/15/2000
  • Status: Active Grant
First Claim
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1. A method for synthesizing GPS satellite measurements for a declared location, comprising:

  • a. receiving network correction data for an epoch comprising;

    i. Satellite ephemeris data;

    ii. Satellite clock corrections;

    iii. Satellite ephemeris corrections;

    iv. Atmospheric parameters; and

    v. residual error corrections derived from one or more reference stations located within a vernier-cell region;

    b. determining whether the declared location is within the vernier-cell region; and

    c. applying the network correction data to determine, for each of a plurality of satellites during an epoch;

    estimated L1 and L2 pseudorange measurements from the satellite to the declared location; and

    estimated phase delays for L1 frequency, for L2 frequency, and for a frequency representing a frequency difference between the L1 frequency and the L2 frequency.

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