Intruder detecting security system

Details Intruder detecting security system Intruder detecting security system

1975-10-20

1977-01-04

Farley, Richard A.

Communications: electrical

Selective

System having rectifier

340258D, 340261, G08B 1300

Patent

active

040017710

ABSTRACT:
This electronic perimeter intruder detecting security system is arranged for measuring the differences of propagation times and/or velocities of a plurality of different seismic-like waves simultaneously set up by an intruder at a plurality of sensor stations and for calculating the location, velocity, and frequently for identifying the type of intruder. Provisions are disclosed for screening false alarms or waves emanating from without a guarded zone and for ignoring waves from sources not of interest in guarding that zone.

REFERENCES:
patent: 2435253 (1948-02-01), Turner
patent: 2535255 (1950-12-01), Barnes et al.
patent: 2614166 (1952-10-01), Piety
patent: 2982942 (1961-05-01), White
patent: 3109165 (1963-10-01), Bagno
patent: 3258762 (1966-06-01), Donner
patent: 3261009 (1966-07-01), Stetten et al.
patent: 3383690 (1968-05-01), Keller
patent: 3525978 (1970-08-01), Heinecke et al.
patent: 3543261 (1970-11-01), Burney
patent: 3585581 (1971-06-01), Aune et al.

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