Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1984-09-14
1986-08-12
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
G08B 1318
Patent
active
046059229
ABSTRACT:
An intrusion detector system with a transmitter having a clock operating at a selected frequency, a pseudorandom code sequence generator for generating one of a selected number of codes, a modulator for spread-spectrum modulating an electromagnetic signal with the generated pseudorandom code sequence signal, and an antenna for transmitting the modulated signal through a zone of protection; and a receiver having an antenna, a demodulator for detecting and demodulating the modulated signal to recover the transmitter pseudorandom code sequence signal, a clock operating at a frequency corresponding to the transmitter clock, a pseudorandom code sequence generator for generating one of a selected number of receiver code signals corresponding to the transmitter code signals, a detector for comparing the received code signal to the receiver code signal and generating a detection signal proportional to the signal amplitude of the received code signal when locked in phase with the receiver code signal, a phase detector for detecting the phase difference between the two code signals, a control for phase synchronizing the two code signals, and a monitor for detecting and signalling changes in the detection signal resulting from entry of movement of an intruder in the zone of protection.
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"Spread-Spectrum Access to Mixed Voice-Data Local Area Networks," Elhakeem, Ahmed K. et al., IEEE Journal on Selected Areas in Communications, Dec. 1983, vol. SAC-1, No. 6, pp. 1054-1069.
Blattman Daniel A.
Middleton Harold G.
Racon, Inc.
Swann III Glen R.
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