Method of and device for detecting the presence of a living being of a particular species in a space monitored by a doppler sensor
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United States of America Patent
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Jun 2, 1998
Grant Date -
N/A
app pub date -
Feb 21, 1997
filing date -
Feb 21, 1996
priority date (Note) -
Expired
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Abstract
The signal delivered by a Doppler sensor is treated after amplification, filtering and digitization by: means for determining the global energy of the digitized signal; autocorrelation test means for showing up a dominant frequency; a filter for rejecting that frequency; comparators for eliminating signals having energy less than a threshold; a filter for isolating a particular frequency band; and means for intercorrelation with a reference signal held in memory.
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