Watching apparatus by means of a radar probe

Details Watching apparatus by means of a radar probe Watching apparatus by means of a radar probe

1996-12-06

1998-12-01

Sotomayor, John B.

Communications: directive radio wave systems and devices (e.g.,

Presence detection only

By motion detection

342 61, 342114, G01S 1356, G01S 1362

Patent

active

058445196

ABSTRACT:
The watching apparatus is provided with a radar probe, and is made such as to detect the presence of human beings. The radar probe includes a command unit and a branching element, inserted between an oscillator circuit and a transmitter stage, as well as a superposing circuit (5), in which a signal, derived from the radar transmitter, is superposed with an echo signal received by a receiver stage. The radar probe is made such as to work as an interference radar, and a delay circuit is inserted into the transmitter-receiver path between the branching element and the superposing circuit in order to increase the travelling time of the radar signal with respect to the branched off signal.

REFERENCES:
patent: 3568188 (1971-03-01), Fishbein
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patent: 4315260 (1982-02-01), Kupfer
patent: 5130717 (1992-07-01), Ewen et al.
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patent: 5311190 (1994-05-01), Devendorf et al.
patent: 5512834 (1996-04-01), McEwan
patent: 5519400 (1996-05-01), McEwan
patent: 5521600 (1996-05-01), McEwan
patent: 5543799 (1996-08-01), Heger
patent: 5668366 (1997-09-01), Mauerhofer
patent: 5682164 (1997-10-01), McEwan

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