Intruder target monitoring sonar alarm system

Details Intruder target monitoring sonar alarm system Intruder target monitoring sonar alarm system

1969-08-26

1990-09-25

Tarcza, Thomas H.

Communications, electrical: acoustic wave systems and devices

Echo systems

Returned signal used for control

367 93, 367 87, G01S 1500

Patent

active

049598171

ABSTRACT:
A system for detecting the presence of intruder targets in an area under ar surveillance and in which the number of normal targets may vary, including the processing of gated time sample receiver signals through a first monitoring circuit having a counter and comparator means to develop output signals representing deviation of actual time sample count from a normal reference count, and through a second monitoring circuit including additional counter and count trigger means for developing an alarm signal responsive to continued deviation of actual count from reference count over several actual counts in a time sequence of counts such that normal variation of target number will not produce an alarm signal.

REFERENCES:
patent: 3380018 (1968-04-01), Littrell et al.

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