POSITIONING DEVICE AND PROGRAM RECORDING STORAGE MEDIUM FOR POSITIONING

• US 20100245174A1
• Filed: 03/23/2010
• Published: 09/30/2010
• Est. Priority Date: 03/24/2009
• Status: Abandoned Application

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Sawada, Kensuke, Mori, Shinichiro, Okuyama, Kyouko
• Application Number:
  US12/730,221
• Publication Number:
  US 20100245174A1
• Time in Patent Office: Days
• US Class Current: 342/451
• CPC Class Codes: G01C 21/1654 with electromagnetic compass
• CPC Class Codes: G01C 22/006 Pedometers
• CPC Class Codes: G01S 19/40 Correcting position, velocity or attitude
• CPC Class Codes: G01S 19/45 by combining measurements of signals from the satellite radio beacon positioning system with a supplementary measurement

Abstract

A positioning device includes: a device body; a direction change detecting section that detects whether a traveling direction of the device body has been changed based on a detection of an azimuth with respect to reference axes preset in the device body; and an absolute position acquiring section that acquires an absolute position of the device body at a timing based on a change of the moving direction of the device body as detected by the direction change detecting section.

Claims

1. A positioning device comprising:

a device body;

a direction change detecting section that detects whether a traveling direction of the device body has been changed based on a detection of an azimuth with respect to reference axes preset in the device body; and

an absolute position acquiring section that acquires an absolute position of the device body at a timing based on a change of the moving direction of the device body as detected by the direction change detecting section.

2. The positioning device according to claim 1, further comprising:

an azimuth acquiring section that provides the detection of the azimuth with respect to the reference axes present in the device body.

3. The position device according to claim 1, further comprising:

a moving distance acquiring section that acquires a moving distance of the device body; and

a moving route acquiring section that specifies a moving route of the device body from the position of the device body acquired using the position acquiring section and the moving distance of the device body acquired using the moving distance acquiring section.

4. A positioning device comprising:

a device body;

an azimuth acquiring section that acquires an azimuth based on reference axes preset in the device body;

a moving distance acquiring section that acquires a moving distance of the device main body;

a direction change detecting section that detects whether a moving direction of the device body has been changed on the basis of a result of acquisition executed using the azimuth acquiring section;

an absolute position acquiring section that acquires absolute position information of the device body at a timing determined on the basis of whether the moving direction of the device body has been changed; and

a moving route acquiring section that specifies a moving route of the device body from the absolute position information of the device body acquired using the absolute position acquiring section and the moving distance of the device body acquired using the moving distance acquiring section.

5. The positioning device according to claim 4, wherein

the absolute position acquiring section acquires the absolute position information of the device body at a timing that the device body has changed its moving direction.

6. The positioning device according to claim 5, further comprising:

an azimuth calculating section that calculates an angle at which the moving direction has been changed using the absolute position information acquired at the timing that the device body has changed its moving direction; and

wherein the moving route acquiring section specifies the moving route of the device body from the angle at which the moving direction has been changed and the moving distance of the device body.

7. The positioning device according to claim 6, wherein

the moving route acquiring section detects a positional error between a position where the traveling direction change detected using the direction change detecting section and a position where the absolute position of the device body has been acquired using the absolute position acquiring section, and further specifies the moving route of the device body using the detected positional error.

8. The positioning device according to claim 6, wherein

the absolute position acquiring section acquires the absolute position of the device body a plurality of times within a consecutive time period before the moving direction is changed and within a consecutive time period after the traveling direction has been changed,

the azimuth calculating section calculates the angle at which the moving direction has been changed from a first line determined from the plurality of absolute positions acquired before the traveling direction is changed and a second line determined from the plurality of absolute positions acquired after the traveling direction has been changed, and

the moving route acquiring section specifies the moving route of the device body from the angle at which the moving direction has been changed and the moving distance of the device body.

9. A computer-readable medium for recording a program allowing a computer to execute:

acquiring an azimuth based on reference axes preset in a device body;

acquiring a moving distance of the device body;

detecting whether a moving direction of the device body has been changed on the basis of a result of the acquiring the azimuth;

acquiring absolute position information of the device body at a timing determined on the basis of information as to whether the moving direction of the device body has been changed from the detecting; and

specifying a moving route of the device body from the acquired absolute position information of the device body and the acquired moving distance of the device body.