Patent ID: 9423250
Filing Date: 2016-08-23
CPC Classification: B64F,F41G,G01C,G01S

Claim Text:
1. A method comprising: initializing an inertial measurement unit (IMU) of a portable device at a starting location; generating first acceleration data by the IMU as the portable device is moved to an intermediate location; receiving, at the portable device, an indication that the IMU is at the intermediate location; generating second acceleration data by the IMU as the portable device is moved to an ending location; calculating, by a processor of the portable device, an initial position estimate of the ending location based on a known position of the starting location, the first acceleration data, and the second acceleration data; calculating, by the processor, corrected acceleration data based on a difference between the initial position estimate of the ending location and a known position of the ending location; determining, by the processor, a position of the intermediate location based on the corrected acceleration data, and generating an output indicating the position of the intermediate location.