Communications: electrical – Condition responsive indicating system – With particular coupling link
Patent
1994-02-18
1995-05-16
Crosland, Donnie L.
Communications: electrical
Condition responsive indicating system
With particular coupling link
340514, 340531, 455 491, G08B 108
Patent
active
054164664
ABSTRACT:
A personal security system includes signaling transmitters and receivers for detecting the transmitted signals. The receivers provide an output representing the received signal strength, which is used in combination with the position of the receiver for locating the point of transmission. All of the transmitters are substantially identical, at least in their transmission characteristics and transmitted signal strength, but include a first portable set of transmitters intended to be carried by subscribers, and a second fixed set of transmitters associated with the receivers. The fixed transmitters are actuated one after another and the receivers are polled to record received signal strength after each transmission from each receiver. The results permit comparisons with expected values, between receivers and over time.
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Amodio Pasquale L.
Malvaso John A.
Crosland Donnie L.
Detection Systems Inc.
Mathews J. Addison
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