Communications – electrical: acoustic wave systems and devices – Echo systems – Presence or movement only detection
Patent
1988-02-17
1989-09-26
Heyman, John S.
Communications, electrical: acoustic wave systems and devices
Echo systems
Presence or movement only detection
340554, 342 28, G01S 1504, G08B 1318
Patent
active
048706639
ABSTRACT:
A method is disclosed for selecting different modes of operation of a means used for counting objects in a given area, such as persons waiting in an elevator lobby. In the method, the movements of the objects are monitored with at least one Doppler radar by observing the Doppler frequencies of the signals reflected by the objects. The method is characterized in that the operation of the means is switched between two modes of operation, so that the mode of operation primarily carrying out the counting of objects on the basis of their stopping and starting is used during a given time interval, and the mode of operation primarily observing merely the movements of the objects is used during another given time interval.
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patent: 4322722 (1982-03-01), Kozdon
patent: 4433328 (1984-02-01), Saphir et al.
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patent: 4727522 (1988-02-01), Steiner et al.
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Kontturi Risto
Kulju Hannu
Heyman John S.
Kone Elevator GmbH
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