Roadside beacon system

Details Roadside beacon system Roadside beacon system

1987-06-18

1990-01-23

Tarcza, Thomas H.

Communications: directive radio wave systems and devices (e.g.,

Directive

Position indicating

342386, 340988, G01S 302, G01S 108, G08G 112

Patent

active

048961612

ABSTRACT:
A navigator system for providing in a moving vehicle a display of the position of the vehicle on a map. This position is recalibrated by a roadside antenna that transmits a split beam so that the signal is a minimum directly in front of the antenna. The on-board navigator recalibrates the position from data transmitted immediately before when the received signal is abruptly decreased as the vehicle passes directly in front of the antenna.

REFERENCES:
patent: 4251797 (1981-02-01), Bragas et al.
patent: 4357593 (1982-11-01), von Tomkewitsch
patent: 4533871 (1985-08-01), Boetzkes

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