Method for measuring distance between two objects and method...

Details Method for measuring distance between two objects and method... Method for measuring distance between two objects and method...

2006-06-13

2006-06-13

Horabik, Michael (Department: 2635)

Communications: electrical

Selective

Intelligence comparison for controlling

C342S127000

Reexamination Certificate

active

07061369

ABSTRACT:
A bidirectional dialogue is carried out between a portable code emitter (15) and a base station (1) for access to a motor vehicle. Both signals are correlated with each other and the dialogue repeated at an altered carrier frequency. The distance of the code emitter (15) from the base station (11) is determined from the difference in two phase difference measurements between the sent and received signal in one station (11or15). Access to, or use of the motor vehicle (10) is only permitted when the code emitter (15) is within a certain distance from the motor vehicle (10).

REFERENCES:
patent: 4757315 (1988-07-01), Lichtenberg et al.
patent: 5293160 (1994-03-01), Kurozu et al.
patent: 5347280 (1994-09-01), Schuermann
patent: 5723911 (1998-03-01), Glehr
patent: 6084530 (2000-07-01), Pidwerbetsky et al.
patent: 2002/0008615 (2002-01-01), Heide et al.

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