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Precise low-latency GNSS satellite clock estimation

  • US 10,191,157 B2
  • Filed: 09/06/2016
  • Issued: 01/29/2019
  • Est. Priority Date: 03/18/2016
  • Status: Active Grant
First Claim
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1. A method for providing a global satellite differential correction signal, the method comprising:

  • collecting raw carrier phase measurements and pseudorange code measurements from a plurality of reference receivers at known corresponding locations that receive satellite signals from a Global Navigation Satellite System (GNSS);

    determining, by a measurement pre-processing module, a wide-lane ambiguity and a respective satellite wide-lane bias for the collected raw carrier phase measurements and code measurements for each satellite;

    determining an orbital narrow-lane ambiguity and an orbital satellite narrow-lane bias for the collected phase measurements for each satellite in an orbit solution based on the collected raw carrier phase and code measurements, consistent with the determined wide-lane ambiguity and the respective satellite wide-lane bias;

    determining satellite orbital correction data for an orbit solution based on the collected raw carrier phase and code measurements and the determined orbital narrow-lane ambiguity and orbital satellite narrow-lane bias;

    determining a clock narrow-lane ambiguity and a respective clock satellite narrow-lane bias for the collected phase measurements for each satellite in a slow clock solution based on the collected raw phase and code measurements, consistent with the determined wide-lane ambiguity and the respective satellite wide-lane bias;

    determining, by a clock solution module, a slow satellite clock correction based on the satellite orbital correction data, the collected raw carrier phase and code measurements and the determined clock narrow-lane ambiguity and clock satellite narrow-lane bias;

    determining lower-latency satellite clock correction data or delta clock adjustment to the slow satellite clock based on freshly or recently updated measurements of the collected raw phase measurements that are more current than a plurality of previous measurements of the collected raw phase measurements used for the slow satellite clock correction to provide lower-latency clock correction data; and

    incorporating the satellite wide-lane bias, the satellite orbital correction data, the satellite narrow-lane bias from the slow clock solution and the low latency clock correction data into the correction data, encoded on the global satellite differential correction signal, with global validity for the GNSS transmission to one or more mobile receivers.

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