Method of estimating the distance between two radio equipments

Details Method of estimating the distance between two radio equipments Method of estimating the distance between two radio equipments

2011-04-26

2011-04-26

Anderson, Matthew D. (Department: 2618)

Telecommunications

Transmitter and receiver at separate stations

Plural transmitters or receivers

C455S069000, C455S067110, C375S260000, C375S267000, C370S204000, C370S264000, C370S490000, C370S487000, C370S334000, C370S400000

Reexamination Certificate

active

07933616

ABSTRACT:
The method comprises a phase, applied by the first equipment (A), for estimating a first time of flight between the two equipments (A, Z) corresponding to the signal transmission time to go from one equipment to the other along a propagation path, called the “strongest path”, taken by a main part of the energy of the signals, a phase for estimating a difference in time of flight comprising the sending of a channel sounding frame by the first equipment to the second and, from the received radio signals corresponding to said channel sounding frame, estimating a difference in time of flight between the strongest propagation path and a first propagation path, performed by the second equipment, and a phase for calculating the distance between the two equipments (A, Z) comprising the determination of a second time of flight by subtracting the estimated difference in time of flight from the estimated first time of flight (E30) and calculating the distance between the two equipments from the duly determined second time of flight.

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