Patent ID: 9568586
Date: 2017-02-14
CPC Classifications: G01C,G01S

Claim:
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) 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) c) estimating, by the processing unit, coordinates of a location of the to-be-positioned device at the (n)