Patent Document ID: 20110231144
Application ID: 13129987
Patent Status: 0

Claim One:
1. A physical quantity measuring device for measuring a physical quantity, comprising: a vector physical quantity detection means for detecting a vector physical quantity composed of a plurality of components; a datumn acquisition means for repeatedly obtaining the detected vector physical quantity as vector physical quantity datumn to obtain vector physical quantity data; and an offset estimation means for calculating a difference vectors from the obtained vector physical quantity data and statistically estimating an offset included in the obtained vector physical quantity data based on a predetermined evaluation formula using the calculated difference vectors, wherein the offset estimation means includes: a difference vector calculating portion for calculating the difference vectors using a difference between each component of the obtained vector physical quantity data; a data selection portion that selects and stores the difference vectors based on a predetermined measurement parameter; a reference point estimation portion that statistically estimates, based on the evaluation formula using the selected difference vectors, coordinates of a reference point on a coordinate system where each component of the obtained vector physical quantity data is a coordinate value; and a reliability determination portion that calculates reliability information on the reference point based on at least one of the vector physical quantity data, the difference vectors and a plurality of the estimated reference points according to a calculation parameter for calculating the reliability information on the reference point, that compares the reliability information with a determination threshold value to determine a degree of reliability of the reference point and that outputs the determined reference point having the desired reliability as an offset included in the vector physical quantity datumn obtained by the datumn acquisition means.