Communications: directive radio wave systems and devices (e.g. – Determining distance – With remote cooperating station
Reexamination Certificate
2007-11-20
2007-11-20
Lobo, Ian J. (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Determining distance
With remote cooperating station
C342S090000
Reexamination Certificate
active
10958165
ABSTRACT:
A system and method for electromagnetic position determination utilizing a calibration process. For calibration, a transmitter is positioned at multiple locations in an area of interest and multiple receivers receive and record signal characteristics from the transmitter to generate a calibration data set. The unknown position of a transmitter may be determined by receiving signals from the transmitter by multiple receivers. A locator data set is generated based on the comparison between two received signal characteristics determined for each receiver. The locator data set is compared with the calibration data set to determine the unknown position. In one embodiment, the signal comparisons are the differences between electric and magnetic field phase. Further embodiments utilize signal amplitude differences. A reciprocal method utilizing a single receiver and multiple transmitter locations is disclosed. A further method is disclosed for determining position by utilizing signals available from existing installed wiring such as power wiring.
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Langford David Wesley
Schantz Hans Gregory
Lobo Ian J.
Q-Track Corporation
Richards James
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