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Fast GNSS receiver convergence by relative positioning

  • US 10,234,566 B2
  • Filed: 02/11/2015
  • Issued: 03/19/2019
  • Est. Priority Date: 02/11/2015
  • Status: Active Grant
First Claim
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1. A method of implementing GNSS convergence by relative positioning, the method comprising:

  • shutting down a GNSS receiver, wherein the GNSS receiver is coupled with a GNSS antenna attached to a mobile machine, and wherein the GNSS receiver is in a converged state and the GNSS antenna is at a first location at shut down;

    storing the first location of the GNSS antenna at shut down;

    monitoring a movement sensor to determine whether a net movement of the GNSS antenna, while the GNSS receiver is shut down, exceeds a threshold net movement parameter; and

    upon power up of the GNSS receiver, initiating a first convergence algorithm in response to determining that the net movement of the GNSS antenna, while the GNSS receiver is shut down, does not exceed the threshold net movement parameter, or that the net movement of the GNSS antenna, while the GNSS receiver is shut down, meets or exceeds the threshold net movement parameter but information from the movement sensor has been used to update a location of the GNSS antenna since shut down, wherein the first convergence algorithm comprises;

    generating ionosphere-free phase observations based on code and phase observations received by the GNSS receiver upon power up;

    generating ionosphere-free time delta phase observations based on the ionosphere-free phase observations, wherein integer ambiguity is cancelled in the ionosphere-free time delta phase observations;

    generating least square estimations based on the ionosphere-free time delta phase observations and ephemeris satellite orbit and clock data received from a network of GNSS reference receivers, wherein the least square estimations result in one or more values, each value representing a change of the GNSS antenna'"'"'s position in a respective time interval of (t−

    1, t); and

    estimating a current location of the GNSS antenna by obtaining a sum of the one or more values resulted from the least square estimations and adding the stored first location of the GNSS antenna at shut down to the sum.

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