Communications: electrical – Condition responsive indicating system – With particular coupling link
Patent
1999-02-16
2000-05-02
Pope, Daryl
Communications: electrical
Condition responsive indicating system
With particular coupling link
3405731, 3405721, 340604, 440 1, G08B 108
Patent
active
060577592
ABSTRACT:
A system for detecting and locating overboard personnel of a vessel. The system includes a plurality of transmitter units and an onboard receiver. A transmitter is assigned to be worn by each person to be monitored by the system. Each transmitter provides a unique identifier signal to the onboard receiver. The onboard receiver is initialized to establish an initial identifier configuration. The onboard receiver then continuously monitors its reception to detect any change in said initial identifier configuration. The onboard receiver triggers an alert in the event of detection of a change in said initial identifier configuration. In a first embodiment the assigned transmitters are activated prior to establishing the initial identifier configuration and the initial identifier configuration consists of all active transmitter identifiers present. In this first embodiment, the alert condition is initiated upon a failure of receipt of one of the identifiers. In a second embodiment, none of the transmitters are activated until it is submerged, the initial identifier configuration consists of no transmitter identifiers present. In this second embodiment, the alert condition is initiated upon receipt of a transmitter identifier. The system can also include a real time clock to record the time of an alert condition and/or a satellite positioning system to record the location of an alert.
REFERENCES:
patent: 5245314 (1993-09-01), Kah
patent: 5650770 (1997-07-01), Schlager et al.
Pope Daryl
Zito Joseph J.
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