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Estimating elevation of a wireless terminal, based on the measurement bias of a pressure reference that is in a second region, based on the measurement bias of a pressure reference that is in a first region

  • US 10,616,399 B1
  • Filed: 10/01/2019
  • Issued: 04/07/2020
  • Est. Priority Date: 03/29/2019
  • Status: Active Grant
First Claim
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1. A method comprising:

  • receiving, by a data processing system, a first series of measurements of barometric pressure made at a first pressure reference, wherein the first pressure reference is at a first outdoor location;

    receiving, by the data processing system, a second series of measurements of barometric pressure made at a second pressure reference, wherein the second pressure reference is at a second outdoor location and at a first known height above the reference level, the first known height being known to the data processing system;

    generating, by the data processing system, a first estimate of bias of barometric pressure measured by the first pressure reference based on;

    (i) the first series of measurements of the barometric pressure made at the first pressure reference,(ii) the second series of measurements of the barometric pressure made at the second pressure reference, and(iii) the first known height of the second pressure reference;

    receiving, by the data processing system, a third series of measurements of barometric pressure made at a third pressure reference when in a first region;

    receiving, by the data processing system, a fourth series of measurements of the barometric pressure made at the third pressure reference after being transported to a second region, wherein the second region is geographically separate from the first region; and

    generating, by the data processing system, a second estimate of bias of barometric pressure measured by a fourth pressure reference in the second region based on;

    (i) a difference between the third and fourth series of measurements of the barometric pressure made at the third pressure reference,(ii) differences in local weather conditions between the first and second regions, and(iii) the first estimate of the bias.

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