NAVIGATION SYSTEM WITH DEVICE ORIENTATION MECHANISM AND METHOD OF OPERATION THEREOF

• US 20130060467A1
• Filed: 07/30/2012
• Published: 03/07/2013
• Est. Priority Date: 09/07/2011
• Status: Active Grant

• Current Assignee: TeleNav Incorporated
• Original Assignee: TeleNav Incorporated
• Inventors: Nash, Christopher Raymond
• Granted Patent: US 8,762,055 B2
• Time in Patent Office: Days
• US Class Current: 701/500
• CPC Class Codes: G01C 21/12 executed aboard the object being navigated; Dead reckoning
• CPC Class Codes: G01C 21/20 Instruments for performing navigational calculations G01C21/24, G01C21/26 take precedence

Abstract

A method of operation of a navigation system includes: receiving acceleration information, including an acceleration measurement, and location information; calculating a total acceleration magnitude, having a vertical acceleration magnitude and a horizontal acceleration magnitude, from the acceleration measurement; calculating an average velocity estimation from the location information; calculating an average acceleration estimation from the location information; calculating a component angle between the average velocity estimation and the average acceleration estimation; calculating a forward acceleration and a lateral acceleration with the component angle and the horizontal acceleration magnitude; and generating a motion classification for a travel acceleration based on the forward acceleration and the lateral acceleration for displaying on a device.

Claims

1. A method of operation of a navigation system comprising:

receiving acceleration information, including an acceleration measurement, and location information;

calculating a total acceleration magnitude, having a vertical acceleration magnitude and a horizontal acceleration magnitude, from the acceleration measurement;

calculating an average velocity estimation from the location information;

calculating an average acceleration estimation from the location information;

calculating a component angle between the average velocity estimation and the average acceleration estimation;

calculating a forward acceleration and a lateral acceleration with the component angle and the horizontal acceleration magnitude; and

generating a motion classification for a travel acceleration based on the forward acceleration and the lateral acceleration for displaying on a device.

2. The method as claimed in claim 1 wherein calculating the total acceleration magnitude includes calculating the total acceleration magnitude based on an x-component magnitude, a y-component magnitude, and a z-component magnitude of the acceleration measurement.

3. The method as claimed in claim 1 further comprising determining the travel acceleration by removing an incidental acceleration from the acceleration measurement based on an acceleration duration threshold.

4. The method as claimed in claim 1 further comprising determining the travel acceleration by removing an incidental acceleration from the acceleration measurement based on an acceleration size threshold.

5. The method as claimed in claim 1 further comprising correlating an average acceleration magnitude of the average acceleration estimation and the horizontal acceleration magnitude based comparing a difference between the average acceleration magnitude and the horizontal acceleration magnitude to an acceleration correlation threshold.

6. A method of operation of a navigation system comprising:

receiving acceleration information, including an acceleration measurement, and location information;

generating an acceleration log with the acceleration information and a location log with the location information;

calculating a total acceleration magnitude, having a vertical acceleration magnitude and a horizontal acceleration magnitude, from the acceleration measurement;

calculating an average velocity estimation from the location information

calculating an average acceleration estimation from the location information;

calculating a component angle between the average velocity estimation and the average acceleration estimation;

calculating a forward acceleration and a lateral acceleration with the component angle and the horizontal acceleration magnitude; and

generating a motion classification for the travel acceleration based on the forward acceleration and the lateral acceleration for displaying on a device.

7. The method as claimed in claim 6 further comprising calculating the horizontal acceleration magnitude as the difference between a vertical acceleration magnitude and the total acceleration magnitude.

8. The method as claimed in claim 6 wherein calculating the component angle includes calculating the component angle as the angle between the average velocity direction of the average velocity estimation and the average acceleration direction of the average acceleration estimation.

9. The method as claimed in claim 6 further comprising calculating the average acceleration estimation based on the average velocity estimation for consecutive entries of the location information in the location log.

10. The method as claimed in claim 6 further comprising calculating the average velocity estimation based on consecutive entries of the location information in the location log.

11. A navigation system comprising:

a collection module for receiving acceleration information, including an acceleration measurement, and location information;

a rotation independence module, coupled to the collection module, for calculating a total acceleration magnitude, having a vertical acceleration magnitude and a horizontal acceleration magnitude, from the acceleration measurement;

a velocity average module, coupled to the rotation independence module, for calculating an average velocity estimation from the location information;

an acceleration average module, coupled to the velocity average module, for calculating an average acceleration estimation from the location information;

an angle calculation module, coupled to the acceleration average module, for calculating a component angle between the average velocity estimation and the average acceleration estimation;

a forward acceleration module, coupled to the angle calculation module, for calculating a forward acceleration with the component angle and the horizontal acceleration magnitude;

a lateral acceleration module, coupled to the angle calculation module, for calculating a lateral acceleration with the component angle and the horizontal acceleration magnitude; and

an acceleration analysis module, coupled to the rotation independence module, for generating a motion classification for a travel acceleration based on the forward acceleration and the lateral acceleration for displaying on a device.

12. The system as claimed in claim 11 wherein the rotation independence module is for calculating the total acceleration magnitude based on an x-component magnitude, a y-component magnitude, and a z-component magnitude of the acceleration measurement.

13. The system as claimed in claim 11 further comprising a filter module, couple to the rotation independence module, for determining the travel acceleration by removing an incidental acceleration from the acceleration measurement based on an acceleration size threshold.

14. The system as claimed in claim 11 further comprising a filter module, couple to the rotation independence module, for determining the travel acceleration by removing an incidental acceleration from the acceleration measurement based on an acceleration duration threshold.

15. The system as claimed in claim 11 further comprising an acceleration correlation module, coupled to the acceleration average module, for correlating an average acceleration magnitude of the average acceleration estimation and the horizontal acceleration magnitude based comparing a difference between the average acceleration magnitude and the horizontal acceleration magnitude to an acceleration correlation threshold.

16. The system as claimed in claim 11 further comprising:

an acceleration log module, coupled to the collection module, for generating an acceleration log with the acceleration information; and

a location log module, coupled to the collection module, for a location log with the location information with the acceleration information.

17. The system as claimed in claim 16 further comprising a horizontal magnitude module, coupled to the rotation independence module, for calculating the horizontal acceleration magnitude as the difference between a vertical acceleration magnitude and the total acceleration magnitude.

18. The system as claimed in claim 16 wherein the angle calculation module is for calculating the component angle as the angle between the average velocity direction of the average velocity estimation and the average acceleration direction of the average acceleration estimation.

19. The system as claimed in claim 16 wherein the acceleration average module is for calculating the average acceleration estimation based on the average velocity estimation for consecutive entries of the location information in the location log.

20. The system as claimed in claim 16 wherein the velocity average module is for calculating the average velocity estimation based on consecutive entries of the location information in the location log.