US 9,544,740 B2Granted

Method, apparatus and computer program product for orienting a smartphone display and estimating direction of travel of a pedestrian

AssigneeNokia Technologies Oy

InventorsJussi Tapani Parviainen, Jussi Taneli Collin

Life of this patent

Estimating the term…

Loading patent…

Abstract

Method, apparatus, and computer program product embodiments provide position determination. An example method embodiment comprises measuring in a mobile device, acceleration in mutually orthogonal x and y directions in a horizontal plane and in a vertical direction, due to walking motion of a user holding the device; computing a Fourier transform of the measured acceleration in the vertical direction and determining a frequency of acceleration in the vertical direction having a maximum amplitude; computing a Fourier transform of the measured acceleration in the x direction and in the y direction and determining a frequency of acceleration in the x and y directions corresponding to the maximum amplitude frequency of acceleration in the vertical direction; and computing a direction of walking motion of the user, based on the determined frequency of acceleration in the x and y directions corresponding to the maximum amplitude frequency of acceleration in the vertical direction.

Claims14

Dependent claims

An apparatus, comprising:

at least one processor;
at least one memory including computer program code;
the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to:
measure acceleration of the apparatus with an accelerometer in the apparatus, in mutually orthogonal x and y directions in a horizontal plane and in a vertical direction, due to walking motion of a user in a walking frame of the user, holding the apparatus, the walking motion of the user characterized by the acceleration in the x direction and the y direction being advanced in phase by 90 degrees or close to 90 degrees before the acceleration in the vertical direction;
compute a Fourier transform of the measured acceleration of the apparatus in the vertical direction and determine a frequency of acceleration in the vertical direction having a maximum amplitude in the frequency spectrum;
compute a Fourier transform of the measured acceleration of the apparatus in the x direction and in the y direction and determine a frequency of acceleration in the frequency spectrum in the x direction and a frequency of acceleration in the frequency spectrum in the y direction corresponding to the maximum amplitude frequency of acceleration in the frequency spectrum in the vertical direction;
compute a direction of walking motion of the user, based on the determined frequency of acceleration in the x direction and the frequency of acceleration in the y direction corresponding to the maximum amplitude frequency of acceleration in the vertical direction;
measure an orientation of an apparatus frame of the apparatus with respect to Earth coordinates, with a gyro or magnetometer in the apparatus;
and
determine that the apparatus frame has changed its orientation with respect to the walking frame of the user, if both the gyro or magnetometer measurements change and the computed direction of walking motion of the user changes.

7 more elements

A computer program product comprising computer executable program code recorded on a computer readable non-transitory storage medium, the computer executable program code comprising:

code for measuring in a handheld mobile device, acceleration of the device with an accelerometer in the device, in mutually orthogonal x and y directions in a horizontal plane and in a vertical direction, due to walking motion of a user holding the device, the walking motion of the user characterized by the acceleration in the x direction and the y direction being advanced in phase by 90 degrees or close to 90 degrees before the acceleration in the vertical direction;
code for computing a Fourier transform of the measured acceleration of the device in the vertical direction and determining a frequency of acceleration in the vertical direction having a maximum amplitude in the frequency spectrum;
code for computing a Fourier transform of the measured acceleration of the device in the x direction and in the y direction and determining a frequency of acceleration in the frequency spectrum in the x direction and a frequency of acceleration in the frequency spectrum in the y direction corresponding to the maximum amplitude frequency of acceleration in the frequency spectrum in the vertical direction;
code for computing a direction of walking motion of the user, based on the determined frequency of acceleration in the x direction and the frequency of acceleration in the y direction corresponding to the maximum amplitude frequency of acceleration in the vertical direction;
code for measuring an orientation of a device frame of the device with respect to Earth coordinates, with a gyro or magnetometer in the device;
and
code for determining that the device frame has changed its orientation with respect to the walking frame of the user, if both the gyro or magnetometer measurements change and the computed direction of walking motion of the user changes.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/760,624Filed 18 Jan 2013
Published: US 2015/0365806 A117 Dec 2015
Granted: 10 Jan 2017
Term ends: Not estimatedThe source records don’t support an estimate.

Classification16 codes

G06F 3/0346
Pointing devices displaced or positioned by the user , e.g. mice, trackballs, pens or joysticks; Accessories therefor: with detection of the…
G01C 21/20
Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00: instruments for performing navigational calculations
G01C 21/206
Instruments for performing navigational calculations: specially adapted for indoor navigation
G06T 3/606
Rotation of whole images or parts thereof: by memory addressing or mapping