System for determining a position of a moving transponder
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United States of America Patent
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Mar 8, 2005
Grant Date -
Aug 19, 2004
app pub date -
Feb 14, 2003
filing date -
Feb 14, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
The invention relates to a system for determining a position of a moving transponder adapted to receive a substantially stationary magnetic field signal and to transmit a further signal. The system comprises a signal generating arrangement adapted to generate said stationary magnetic field signal for said transponder, said transponder being adapted to determine a plurality of signal strengths of said received magnetic field signal; at least one signal receiving arrangement, adapted to receive said further signal of said transponder, said transponder being adapted to insert at least one message portion in said further signal indicative of at least one of said plurality of signal received signal strengths and processing means adapted to determine said position in accordance with a plurality of said received signal strengths determined by said moving transponder. This further signal can e.g. be an electromagnetic signal of high frequency that has a high bandwidth enabling the use of a large number of transponders in a sporting event. Furthermore, the power of an electromagnetic signal decreases less rapidly with the distance travelled, such that the high frequency signal can be received at a further distance from the transponder.
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