Physical quantity data correcting device and physical quantity data correcting method

• US 9,897,446 B2
• Filed: 03/05/2014
• Issued: 02/20/2018
• Est. Priority Date: 03/15/2013
• Status: Active Grant

• Current Assignee: Asahi Kasei Microdevices Corporation (Asahi Kasei Corporation)
• Original Assignee: Asahi Kasei Microdevices Corporation (Asahi Kasei Corporation)
• Inventors: Kitamura, Toru, Kitaura, Munehiro
• Primary Examiner(s): Nguyen, Lam
• Application Number:
  US14/385,296
• Publication Number:
  US 20160273915A1
• Time in Patent Office: 1,448 Days
• Field of Search: 702 92, 702 93, 702 94
• CPC Class Codes: G01C 17/02 Magnetic compasses
• CPC Class Codes: G01C 17/38 Testing, calibrating, or compensating of compasses
• CPC Class Codes: G01D 3/022 having an ideal characteristic, map or correction data stored in a digital memory

Abstract

A physical quantity data correcting device accurately and rapidly makes corrections of physical quantity data by appropriately controlling an approximate ellipsoid computing unit and/or a correction coefficient computing unit on the basis of a control parameter group. A physical quantity data acquiring unit acquires physical quantity data output from a physical quantity detecting unit that detects physical quantities. A data selecting unit selects the acquired physical quantity data. An approximate ellipsoid computing unit computes an approximate expression of an n-dimensional ellipsoid indicating a distribution shape obtained by distributing the selected physical quantity data in an n-axis coordinate space. A correction coefficient computing unit computes correction coefficients for correcting the computed n-dimensional ellipsoid to an n-dimensional sphere. A computation control unit controls the approximate ellipsoid computing unit and/or the correction coefficient computing unit on the basis of a control parameter group. A correction data output unit corrects the physical quantity data.

Claims

1. A physical quantity data correcting device comprising:

a physical quantity data acquiring unit that acquires physical quantity data output from an n-axis (where n is an integer of two or greater) physical quantity detecting unit;

an approximate ellipsoid computing unit that computes an approximate expression of an n-dimensional ellipsoid approximating a distribution shape obtained by distributing the physical quantity data in an n-axis coordinate space;

a correction coefficient computing unit that computes a correction coefficient for correcting the n-dimensional ellipsoid to an n-dimensional sphere;

a computation control unit that has a control parameter group, and controls at least one of the approximate ellipsoid computing unit and the correction coefficient computing unit on the basis of the control parameter group; and

a correction data output unit that corrects the physical quantity data on the basis of the correction coefficient and that outputs corrected physical quantity data,

wherein the computation control unit sets accuracy of the corrected physical quantity data, and the control parameter group varies depending on the accuracy of the corrected physical quantity data; and

wherein the control parameter group includes a parameter for evaluating validity of the computation of the approximate ellipsoid computing unit or validity of the computation of the correction coefficient computing unit.

2. The physical quantity data correcting device according to claim 1, wherein the parameter for evaluating the validity of the computation of the approximate ellipsoid computing unit or the validity of the computation of the correction coefficient computing unit is a parameter based on the n-dimensional volume of the distribution shape obtained by distributing the physical quantity data in the n-axis coordinate space.

4. A program causing a computer to function as the physical quantity data correcting device according to claim 1.

3. A physical quantity data correcting method comprising:

a physical quantity data acquiring step of acquiring physical quantity data output from an n-axis (where n is an integer of two or greater) physical quantity detecting unit;

an approximate ellipsoid computing step of computing an approximate expression of an n-dimensional ellipsoid approximating a distribution shape obtained by distributing the physical quantity data in an n-axis coordinate space;

a correction coefficient computing step of computing a correction coefficient for correcting the n-dimensional ellipsoid to an n-dimensional sphere;

a computation control step of controlling at least one of the approximate ellipsoid computing step and the correction coefficient computing step on the basis of a control parameter group; and

a correction data output step of correcting the physical quantity data on the basis of the correction coefficient and outputting corrected physical quantity data,

wherein the computation control step sets accuracy of the corrected physical quantity data, and the control parameter group varies depending on the accuracy of the corrected physical quantity data; and

wherein the control parameter group includes a parameter for evaluating validity of the computation of the approximate ellipsoid computing step or validity of the computation of the correction coefficient computing step.