Method for selecting the mode of operation of an object counting means
US4870663A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 17, 1988 |
| Grant date | Sep 26, 1989 |
| Priority date | — |
| Expiry date | Feb 17, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S13/56
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.