Method of and device for detecting the presence of a living being of a particular species in a space monitored by a doppler sensor
US5760687A · kind A · utility
33Cited by
10References
14Claims
0Family size
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Key dates
| Filing date | Feb 21, 1997 |
| Grant date | Jun 2, 1998 |
| Priority date | — |
| Expiry date | Feb 21, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S13/56
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.