Method of and system for classifying emergency locating transmit

Details Method of and system for classifying emergency locating transmit Method of and system for classifying emergency locating transmit

1979-12-12

1983-07-19

Chin, Tommy P.

Telecommunications

Transmitter

Mobile or portable

455 38, 455 99, 340 27R, 340539, H04B 726

Patent

active

043947778

ABSTRACT:
During a distress call, a distress location transmitter 10 generates a high frequency carrier signal 40 that is modulated by a predetermined distress waveform characteristic 29. The classification of user associated with the distress call is identified by periodically interrupting modulation 42; user classification is determined by the repetition rate of the interruptions, the interruption periods, or both.

REFERENCES:
patent: 2945094 (1960-07-01), Metzger
patent: 3510777 (1970-05-01), Gordon
patent: 3928805 (1975-12-01), Mactaggart
patent: 4103236 (1978-07-01), Deserno
patent: 4155042 (1979-05-01), Permut
patent: 4241326 (1980-12-01), Odom

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