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Method for positioning a to-be-positioned device

  • US 9,568,586 B2
  • Filed: 03/07/2016
  • Issued: 02/14/2017
  • Est. Priority Date: 04/13/2015
  • Status: Active Grant
First Claim
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1. A method for positioning a to-be-positioned device, the method to be implemented by a positioning system that includes a distance estimating unit, an orientation estimating unit disposed on the to-be-positioned device, and a processing unit coupled to the distance estimating unit and the orientation estimating unit, the method comprising the steps of:

  • a) estimating, by the distance estimating unit, an absolute distance between a reference point and the to-be-positioned device at each of a current time point and a number (N) of consecutive previous time points before the current time point, where N is an integer smaller than n, n is a non-negative integer indicating a total number of time points accumulated since the to-be-positioned device starts to move, the current time point is defined as the (n)th time point, a (j)th time period is defined as a time period between (j−

    1)th and (j)th time points, and j is an integer ranging from 1 to n;

    b) estimating, by the orientation estimating unit, a unit vector of a movement direction of the to-be-positioned device in each of (n−

    N+1)th to (n)th time periods; and

    c) estimating, by the processing unit, coordinates of a location of the to-be-positioned device at the (n)th time point based on the absolute distance(s) estimated in step a), the unit vector(s) estimated in step b), and coordinates of a location of the to-be-positioned device at each of the number (N) of the consecutive previous time points.

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