METHOD AND APPARATUS FOR DETERMINING HEADING ANGLE IN WIRELESS LAN

• US 20130053064A1
• Filed: 08/31/2012
• Published: 02/28/2013
• Est. Priority Date: 08/31/2011
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd., SNU R&DB Foundation (Seoul National University)
• Original Assignee: Samsung Electronics Co. Ltd., SNU R&DB Foundation (Seoul National University)
• Inventors: Park, Kyong-Ha, Hong, Hyun-Su, Park, Sung-Min, Park, Joon-Goo, Park, Chan-Gook, Cho, Hyun-Hun
• Application Number:
  US13/601,946
• Publication Number:
  US 20130053064A1
• Time in Patent Office: Days
• US Class Current: 455/456.1
• CPC Class Codes: G01C 21/12 executed aboard the object being navigated; Dead reckoning
• CPC Class Codes: G01S 5/0247 Determining attitude
• CPC Class Codes: H04W 64/006 with additional information processing, e.g. for direction or speed determination

Abstract

A method determines a heading angle of a user terminal in a Wireless Local Area Network (WLAN) system. The method includes examining whether a rotation of a user is detected, upon detecting the rotation, attaining a movement direction vector at a time when the rotation is detected, and attaining the heading angle by using the movement direction vector at the time when the rotation is detected.

Claims

1. A method for determining a heading angle of a user terminal in a Wireless Local Area Network (WLAN) system, the method comprising:

determining whether a rotation of a user is detected;

upon detecting the rotation, identifying a movement direction vector at a time when the rotation is detected; and

identifying the heading angle using the movement direction vector at the time when the rotation is detected.

2. The method of claim 1, wherein the rotation is detected when:

Δ

RSSIB<

Δ

RSSIA, in case of indicating a rotation in a direction ‘

B’

, where Δ

RSSI is defined as;

3. The method of claim 1, wherein upon detecting the rotation, identifying the movement direction vector comprises:

identifying a movement vector between a location determined at a current time and a reference location.

4. The method of claim 1 further comprising:

when the rotation is not detected, identifying a movement direction vector at a time when the rotation is not detected; and

identifying the heading angle using the movement direction vector at the time when the rotation is not detected.

5. The method of claim 4, wherein identifying the movement direction vector at the time when the rotation is not detected comprises:

identifying a movement vector between a location determined at a current time and a location determined at a previous time.

6. The method of claim 4, wherein identifying the heading angle at the time when the rotation is not detected uses the following equation:

7. The method of claim 1, wherein identifying the heading angle at the time when the rotation is detected uses the following equation:

8. The method of claim 7 further comprising:

identifying an azimuth using the heading angle at the time when the rotation is detected or at a time when the rotation is not detected.

9. The method of claim 1 further comprising:

performing positioning.

10. The method of claim 1 further comprising:

identifying a position of the user terminal based on the heading angle.

11. An apparatus of a user terminal for determining a heading angle in a Wireless Local Area Network (WLAN) system, the apparatus comprising:

a modem configured to communicate with another node;

a controller configured to identify whether a rotation of a user is detected using the modem, identify a movement direction vector at a time when the rotation is detected upon detecting the rotation, and identify the heading angle using the movement direction vector at the time when the rotation is detected; and

a storage unit configured to store a signal strength based on a distance from reference points and a signal strength depending on a distance from an Access Point (AP).

12. The apparatus of claim 11, wherein to detect the rotation, the controller is further configured to detect the rotation when:

Δ

RSSIB<

Δ

RSSIA, in case of indicating a rotation in a direction ‘

B’

, where Δ

RSSI is defined as;

13. The apparatus of claim 11, wherein upon detecting the rotation, the controller is further configured to identify a movement vector between a location determined at a current time and a reference location.

14. The apparatus of claim 11, wherein when the rotation is not detected, the controller is further configured to identify a movement direction vector at a time when the rotation is not detected, and identify the heading angle using the movement direction vector at the time when the rotation is not detected.

15. The apparatus of claim 14, wherein to identify the movement direction vector at the time when the rotation is not detected, the controller is further configured to identify a movement vector between a location determined at a current time and a location determined at a previous time.

16. The apparatus of claim 14, wherein the controller is further configured to identify the heading angle at the time when the rotation is not detected using the following equation:

17. The apparatus of claim 11, wherein the controller is further configured to identify the heading angle at the time when the rotation is detected using the following equation:

18. The apparatus of claim 17, wherein the controller is further configured to identify an azimuth using the heading angle at the time when the rotation is detected or at a time when the rotation is not detected.

19. The apparatus of claim 11, wherein the controller is further configured to perform positioning.

20. The apparatus of claim 11, wherein the controller is further configured to identify a position of the user terminal based on the heading angle.