POSITIONING APPARATUS, POSITIONING METHOD AND STORAGE MEDIUM

• US 20130082871A1
• Filed: 09/13/2012
• Published: 04/04/2013
• Est. Priority Date: 09/30/2011
• Status: Active Grant

• Current Assignee: Casio Computer Company Limited
• Original Assignee: Casio Computer Company Limited
• Inventors: WATANABE, Kouhei
• Granted Patent: US 9,019,156 B2
• Time in Patent Office: Days
• US Class Current: 342/357.3
• CPC Class Codes: G01S 19/47 the supplementary measurement being an inertial measurement, e.g. tightly coupled inertial

Abstract

A positioning apparatus, positioning method and storage medium are described. According to one implementation, a positioning apparatus includes a first positioning section, a second positioning section, a first calculating section, a control section and a specifying section. The first positioning section performs positioning of the positioning apparatus. The second positioning section performs positioning of displacement of the positioning apparatus. The first calculating section calculates a positioning accuracy of displacement. The control section controls measurement operation of the first and the second positioning sections based on the positioning accuracy calculated by the first calculating section. The specifying section specifies a present position of the positioning apparatus based on a measured result of the first and second positioning sections.

Claims

1. A positioning apparatus comprising:

a first positioning section which receives a signal transmitted from a positioning satellite and performs positioning of a position of an positioning apparatus;

a second positioning section which detects a movement and traveling azimuth of the positioning apparatus and performs positioning of displacement of the positioning apparatus based on the detected result;

a first calculating section which calculates a positioning accuracy of displacement of the positioning apparatus based on the movement detected by the second positioning section;

a control section which controls a measurement operation of the first positioning section and the second, positioning section based on the positioning accuracy calculated by the first calculating section; and

a specifying section which specifies a present position of the positioning apparatus based on a measured result by the measurement operation of the first positioning section and the second positioning section controlled by the control section.

2. The positioning apparatus according to claim 1, wherein,

the second positioning section further includes a triaxial acceleration sensor which detects acceleration in each direction of three axes orthogonal to each other;

and

the first calculating section calculates stability of a holding state of the positioning apparatus by the user as the positioning accuracy based on the detected result by the triaxial acceleration sensor.

3. The positioning apparatus according to claim 2, wherein, the first calculating section further calculates the stability of the holding state of the positioning apparatus based on a sum of squares of a frequency component of 0 Hz among the detected signal of each axis detected by the triaxial acceleration sensor.

4. The positioning apparatus according to claim 1, wherein, the control section further changes a measurement interval of the position of the positioning apparatus by the first positioning section based on the positioning accuracy calculated by the first calculating section.

5. The positioning apparatus according to claim 1, further comprising:

a second calculating section which calculates a positioning accuracy of a position of the positioning apparatus based on the positioning result by the first positioning section,

wherein the specifying section specifies the present position of the positioning apparatus based on the positioning accuracy calculated by the first calculating section and the positioning accuracy calculated by the second calculating section.

6. The positioning apparatus according to claim 5 wherein, the second calculating section calculates the positioning accuracy of the position of the positioning apparatus based on at least one of a GST value, a C/N value, a DOP value or an EPE value.

7. A positioning method using a positioning apparatus comprising the steps of:

a first positioning process which receives a signal transmitted from a positioning satellite and performs positioning of a position of the positioning apparatus;

a second positioning process which detects a movement and traveling azimuth of the positioning apparatus and performs positioning of displacement of the positioning apparatus based, on the detected result;

a first calculating process which calculates a positioning accuracy of displacement of the positioning apparatus based on the movement detected by the second positioning process;

a control process which controls a measurement operation of the first positioning process and the second positioning process based on the positioning accuracy calculated by the first calculating process; and

a specifying process which specifies a present position of the positioning apparatus based on a measured result by the measurement operation of the first positioning process and the second positioning process controlled by the control process.

8. A non-transitory computer-readable storage medium having a program stored thereon for controlling a computer of the positioning apparatus to function as:

a first positioning section which receives a signal transmitted from a positioning satellite and performs positioning of a position of the positioning apparatus;

a second positioning section which detects a movement and traveling azimuth of the positioning apparatus and performs positioning of displacement of the positioning apparatus based on the detected result;

a first calculating section which calculates a positioning accuracy of displacement of the positioning apparatus based on the movement detected by the second positioning section;

a control section which controls a measurement operation of the first positioning section and the second positioning section based on the positioning accuracy calculated by the first calculating section; and

a specifying section which specifies a present position of the positioning apparatus based on a measured result by the measurement operation of the first positioning section and the second positioning section controlled by the control section.