Spatial Information Detecting System, its Detecting Method, and Spatial Information Detecting Device
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United States of America Patent
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Issued Date -
Nov 4, 2010
app pub date -
Feb 8, 2008
filing date -
Feb 9, 2007
priority date (Note) -
Abandoned
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Abstract
The present invention relates to a spatial information detecting system. A magnetic sensor driving unit drives a magnetic sensor via a multiplexer unit. Signals of the magnetic sensor are converted from analog signals to digital signals, and are transmitted from a data transmitting unit to an arithmetic unit as magnetic data. A Fourier transform unit calculates the amplitudes and phases of a plurality of frequency components of individual axes from the output signal of the magnetic data receiving unit. A magnetic field vector calculating unit calculates signs of the amplitudes of the individual axes from phase relationships between the plurality of frequency components on the individual axes from the output signal from the Fourier transform unit, and calculates the magnetic field vector representing the direction and magnitude of the magnetic field from the signs and amplitudes. A direction calculating unit calculates the direction of the information terminal.
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