Location system

Details Location system Location system

1993-08-10

1995-08-01

Peng, John K.

Communications: electrical

Condition responsive indicating system

Specific condition

34082549, 340539, 340636, 340660, G08B 2300

Patent

active

054383218

ABSTRACT:
A location system for tracking miners underground includes a number of identification stations connected to a central control station. Miners are issued with portable identification modules which are fitted to their caplamps and which are powered by their battery packs. The identification modules transmit unique identification signals at intervals, which are picked up by the identification stations. The identification modules change the intervals between successive transmissions continually, and the identification stations can read overlapping transmissions, so that the reliability of detection is good. Miners who are issued with a caplamp first pass an identification card through a reader, which reads a unique personal identification code from the card. This code is correlated with the identification code of the identification module in the caplamp at the central control station. The invention includes a portable location device for tracking lost miners, which is a direction finding receiver adapted to receive and display the identification code transmitted by the identification module of a lost miner. The identification codes of members of a search party are stored in the device, so that they are ignored in use.

REFERENCES:
patent: 4275385 (1981-06-01), White
patent: 4275385 (1981-06-01), White
patent: 4491971 (1985-01-01), Webb et al.
patent: 4495496 (1985-01-01), Miller, III
patent: 4598275 (1986-07-01), Ross et al.
patent: 4709330 (1987-11-01), Yokoi et al.
patent: 4955000 (1990-09-01), Nastrom
patent: 4998095 (1991-03-01), Shields
Database WPI, Week 9043, Derwent Publications, Ltd., AN-90-327645.

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