Navigation system with device orientation mechanism and method of operation thereof

• US 8,762,055 B2
• Filed: 07/30/2012
• Issued: 06/24/2014
• Est. Priority Date: 09/07/2011
• Status: Active Grant

• Current Assignee: TeleNav Incorporated
• Original Assignee: TeleNav Incorporated
• Inventors: Nash, Christopher Raymond
• Primary Examiner(s): Cheung, Mary
• Assistant Examiner(s): WONG, YUEN H
• Application Number:
  US13/562,202
• Publication Number:
  US 20130060467A1
• Time in Patent Office: 694 Days
• Field of Search: 701/500, 702/141
• 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, the acceleration information for measuring an acceleration of a device in a vehicle;

calculating a total acceleration magnitude, having a vertical acceleration magnitude and a horizontal acceleration magnitude, from the acceleration measurement for removing a dependence of the acceleration measurement on an orientation of the device;

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, with a control unit, for representing a travel acceleration of the vehicle with the device therein based on the forward acceleration and the lateral acceleration for displaying on the 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, the acceleration information for measuring an acceleration of a device in a vehicle;

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 for removing a dependence of the acceleration measurement on an orientation of the device;

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, with a control unit, for representing the travel acceleration of the vehicle with the device therein based on the forward acceleration and the lateral acceleration for displaying on the device.

7. The method as claimed in claim 6 further comprising calculating the horizontal acceleration magnitude as a difference between the 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 an angle between an average velocity direction of the average velocity estimation and an 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:

an accelerometer unit configured to send acceleration information, including an acceleration measurement, and location information, the acceleration information for measuring an acceleration of a device in a vehicle; and

a control unit, coupled to the accelerometer unit, configured to;

calculate a total acceleration magnitude, having a vertical acceleration magnitude and a horizontal acceleration magnitude, from the acceleration measurement for removing a dependence of the acceleration measurement on an orientation of the device;

calculate an average velocity estimation from the location information;

calculate an average acceleration estimation from the location information;

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

calculate a forward acceleration with the component angle and the horizontal acceleration magnitude;

calculate a lateral acceleration with the component angle and the horizontal acceleration magnitude; and

generate a motion classification for representing a travel acceleration of the vehicle with the device therein based on the forward acceleration and the lateral acceleration for displaying on the device.

12. The system as claimed in claim 11 wherein the control unit is configured to calculate 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 wherein the control unit is configured to determine 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 wherein the control unit is configured to determine 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 wherein the control unit is configured to correlate 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 wherein the control unit is configured to generate:

an acceleration log with the acceleration information; and

a location log with the location information with the acceleration information.

17. The system as claimed in claim 16 wherein the control unit is configured to calculate the horizontal acceleration magnitude as a difference between the vertical acceleration magnitude and the total acceleration magnitude.

18. The system as claimed in claim 16 wherein the control unit is configured to calculate the component angle as an angle between an average velocity direction of the average velocity estimation and an average acceleration direction of the average acceleration estimation.

19. The system as claimed in claim 16 wherein the control unit is configured to calculate 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 control unit is configured to calculate the average velocity estimation based on consecutive entries of the location information in the location log.