Low consumption pulses doppler effect intrusion sensor

Details Low consumption pulses doppler effect intrusion sensor Low consumption pulses doppler effect intrusion sensor

1978-04-19

1981-10-13

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

343 5PD, 343 171PF, 367 94, G01S 1356, G08B 1318

Patent

active

042951313

ABSTRACT:
The present invention is related to intrusion sensors for alarm systems which employ Doppler detection. The transmitter of this invention transmits pulse modulated signals having a pulse repetition frequency greater than twice the highest Doppler frequency to be detected. In a manner similar to the well known sampling theorem, the received reflected pulses contain all the Doppler information contained in a similar continuous oscillation Doppler detection system because the highest Doppler frequency to be detected can be reconstituted from the received reflected signals. The duty cycle of the transmitted pulses is limited by the above described pulse repetition frequency limitation and a further requirement that the pulse length be sufficient to enable return of the leading edge of the pulse prior to the end of the pulse.

REFERENCES:
patent: 3673590 (1972-06-01), Corvi et al.
patent: 3731307 (1973-05-01), Charlot, Jr.
patent: 3754254 (1973-08-01), Jinman
patent: 3975729 (1976-08-01), Ringer

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