Method and system for monitoring vehicle location

Details Method and system for monitoring vehicle location Method and system for monitoring vehicle location

1989-05-15

1990-07-03

Blum, Theodore M.

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

Directive

Beacon or receiver

342457, 342398, G01S 124

Patent

active

049395220

ABSTRACT:
Multiple vehicles located within a predefined search space are located and tracked using at least two spaced-apart transmitters. Each transmitter can broadcast an omnidirectional initialization signal and a positioning signal having a null or break in its wavefront. By rotating the positioning signal, the null will sweep the predefined search space and by detecting both the initialization signal and the null in the positioning signal, the position of each vehicle can be determined. In the preferred embodiment, the locational information from each vehicle is collected at a central location, typically in a data acquisition system or controller. In the particularly preferred embodiment, the locational information is further relied on to provide for command information for feedback control of the vehicles.

REFERENCES:
patent: H288 (1987-06-01), Gutleber
patent: 31962 (1885-07-01), Brodeur
patent: 3922677 (1975-11-01), Tomkewitsch et al.
patent: 4305077 (1981-12-01), Tsumura
patent: 4319243 (1982-03-01), Vachenauer et al.
patent: 4533871 (1985-08-01), Boetzkes

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