Intrusion alarm system with improved air turbulence compensation

Details Intrusion alarm system with improved air turbulence compensation Intrusion alarm system with improved air turbulence compensation

1976-05-05

1978-08-15

Trafton, David L.

Communications: electrical

Condition responsive indicating system

Specific condition

343 77, 343100CL, G08B 1316

Patent

active

041076591

ABSTRACT:
A mathematical analysis reveals the existence of circular motion in the head of a rotating phasor which represents the received signal in a Doppler intrusion alarm system in the presence of a moving target. The circular motion is virtually nonexistent when a moving target is absent regardless of the presence of environmental disturbances such as air turbulence and noise transients. The mathematical revelations are confirmed by a considerable amount of experimental data representing hundreds of thousands of measurements under various environmental conditions. The invention makes use of these new findings in combination with a new signal processing system which incorporates a circle detector for recognizing the presence of circular motion in the head of a rotating phasor when it occurs in the received signal, thus permitting absolute detection of a moving target even in the presence of environmental disturbances, such as air turbulence, while the system remains immune to false alarms due to these disturbances. The use of digital circuitry eliminates the need for sensitivity controls such as are required in prior art systems, thereby insuring correct installation of the inventive system with maximum reliability of operation.

REFERENCES:
patent: 3111657 (1963-11-01), Bagno
patent: 3153237 (1964-10-01), Lakatos
patent: 3631490 (1971-12-01), Palmieri
patent: 3882303 (1975-05-01), Linder
patent: 3885234 (1975-05-01), Fujimoto
patent: 3925773 (1975-12-01), Green
patent: 3942178 (1976-03-01), Hackett

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