Signal-processing unit for fluxgate magnetometers

Details Signal-processing unit for fluxgate magnetometers Signal-processing unit for fluxgate magnetometers

2008-04-29

2008-04-29

Barlow, John (Department: 2863)

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Mechanical measurement system

C324S247000

Reexamination Certificate

active

11501918

ABSTRACT:
A signal processing unit includes an integrating unit. The integrating unit is composed of a plurality of digital elements and is operative to integrate a detection signal over every quarter of one cycle of the detection signal to generate an integration value. The integration values to be generated are represented as S1, S2, S3, and S4. A calculating unit includes a plurality of digital elements and performs addition and subtraction on the generated integration values in accordance with the following equations used to calculate an in-phase component and a quadrature-phase component of (Ip=S4p−3+S4p−2−S4p−1−S4p) and (Qp=S4.4−S4p−−S4p−1+S4p). Where Ip represents the in-phase component and Qp represents the quadrature-phase component. An amplitude obtaining unit obtains an amplitude of the detection signal based on the in-phase component and the quadrature-phase component.

REFERENCES:
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patent: 2005/0047526 (2005-03-01), Watanabe et al.
patent: 2005-102129 (2005-04-01), None
“Fluxgate Magnetometers for Outer Planets Exploration” by M. H. Acuna; IEEE Transactions On Magnetics, vol. 10; 1974; pp. 519-523 (discussed on p. 6 in the spec.).
“Small Size Magnetic Field Sensor” by Makoto Kawakami et al.; Technical Publication ofSumitomo Tokushu Kinzoku, vol. 14; Mar. 2003; pp. 109-112 (discussed on p. 6 in the spec.).
“Integrated Driving and Readout Circuits for Orthogonal Fluxgate Sensor” by Xinbo Qian et al.; IEEE Transactions On Magnetics, vol. 41, No. 10; Oct. 2005; pp. 3715-3717 (discussed on p. 6 in the spec.).
“Symmetric Response Obtained With an Orthogonal Fluxgate Operating in Fundamental Mode” by Ichiro Sasada: IEEE Transactions On Magnetics, vol. 38, No. 5; Sep. 2002; pp. 3377-3379 (discussed on p. 6 in the spec.).

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