Surveillance system in which a reflected signal pattern is compa

Details Surveillance system in which a reflected signal pattern is compa Surveillance system in which a reflected signal pattern is compa

1980-10-17

1983-05-03

Swann, III, Glen R.

Communications, electrical: acoustic wave systems and devices

Echo systems

Presence or movement only detection

340552, 340555, 343 5PD, G08B 1316

Patent

active

043822916

ABSTRACT:
Radiation energy is emitted intermittently to an area under surveillance and a pattern of reflections is formed. Thereafter, the pattern of reflections is statistically compared with a reference pattern which is prepared in advance. When the two patterns are different, an alarm is activated.

REFERENCES:
patent: 3825676 (1974-07-01), Ramsden, Jr.
patent: 3967283 (1976-06-01), Clark et al.
patent: 3987427 (1976-10-01), Clift
patent: 4016529 (1977-04-01), Inuzuka et al.
patent: 4028690 (1977-06-01), Buckley et al.
patent: 4131872 (1978-12-01), Inoue et al.
patent: 4142188 (1979-02-01), Zetting et al.

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