Communication device and distance calculation system

Details Communication device and distance calculation system Communication device and distance calculation system

2005-10-07

2008-12-16

Hofsass, Jeff (Department: 2612)

Communications: electrical

Land vehicle alarms or indicators

Of relative distance from an obstacle

C340S005610, C342S125000

Reexamination Certificate

active

07466219

ABSTRACT:
A communication device (e.g., an vehicle-mounted device) comprises a transmitter that transmits a distance-calculation signal with which to calculate a distance to a partner communication device (e.g., a mobile device), a detector that receives the distance-calculation signal returned from the partner communication device and detects a phase difference between the distance-calculation signal when transmitted and the distance-calculation signal when received, and a calculator that calculates the distance to the partner communication device based on the phase difference detected by the detector.

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patent: 6346878 (2002-02-01), Pohlman et al.
patent: 6803851 (2004-10-01), Kramer et al.
patent: 2003/0090365 (2003-05-01), Bergerhoff
patent: 2000-198420 (2000-07-01), None

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