Data processing: measuring – calibrating – or testing – Calibration or correction system – Position measurement
Reexamination Certificate
2008-03-04
2008-03-04
Barlow, John (Department: 2863)
Data processing: measuring, calibrating, or testing
Calibration or correction system
Position measurement
C701S224000
Reexamination Certificate
active
10563128
ABSTRACT:
There are provided an azimuth measurement device and its method for realizing an update of an offset calculated from the data acquired by azimuth measurement. A geomagnetism output measured by a 3-axis magnetic sensor is amplified and input to an A/D conversion section. A chopper section is arranged for switching the terminals for driving an X-axis, Y-axis and a Z-axis magnetic sensor and applies drive voltage output from a drive power source section to the X-axis, the Y-axis and the Z-axis magnetic sensor. The output amplified value amplified by the amplification section is converted from an analog signal to a digital signal by the ND conversion section and then is input to a sensitivity/offset correction calculation section. Output data from this sensitivity/offset correction calculation section is input to an azimuth calculation section and the corresponding azimuth information is output. A reliability information calculation section outputs reliability information.
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Kitamura Toru
Mikoshiba Norihiko
Sato Masanobu
Yamashita Masaya
Asahi Kasei Emd Corporation
Barlow John
Finnegan Henderson Farabow Garrett & Dunner LLP
Kundu Sujoy
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