Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1980-01-07
1992-04-21
Moskowitz, Nelson
Communications: electrical
Condition responsive indicating system
Specific condition
367136, G08B 1300, G08B 1322
Patent
active
051072505
ABSTRACT:
A system for detecting and classifying vehicles, moving in the vicinity of a seismic detector, includes a time threshold circuit and, complementary to this circuit, two parallel amplitude detector circuits. One detector circuit utilizes amplitude thresholding to distinguish the seismic vibrations characteristic of moving vehicles, from other seismic vibrations. The other detector circuit utilizes amplitude thresholding to distinguish the seismic vibrations characteristic of a particular kind of moving vehicle (e.g. a tracked vehicle), from other seismic vibrations. The results of these two amplitude detector circuits and of the time threshold circuit are utilized by an indicator circuit and an indication of detected vehicle kind (e.g. tracked or wheeled) provided. Indication may be relayed, to a remote observer, by radio transmission.
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Moskowitz Nelson
The Secretary of State for Defence in Her Britannic Majesty's Go
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