To provide an electromagnetic system for determining and tracing a position, wherein problems of interference is dissolved.
An evaluator with one or more set of radiators which is adapted to generate an energy field with at least one fundamental frequency, is provided. A receiving sensor is so adapted as to generate the first signal by responding to the energy field while an interferer is at the first position from the receiving sensor and as to generate the second signal by responding to the energy field while the interferer is at the second position from the receiving sensor. A controlling unit is so adapted as to: (a) receive and analyze the first and second signals to calculate characteristics in finger print signals from the interferer; (b) store data which indicate the finger print signal in association with identity of the interferer, to a data base.
| JP2001524339A | 2001-12-04 | |||
| JPH0534447A | 1993-02-09 |
| WO2002091012A2 | 2002-11-14 |
Konobu Kato
Hideaki Tazawa
Hamada Hatsune
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