Microwave motion detector with target angle detection

Details Microwave motion detector with target angle detection Microwave motion detector with target angle detection

2011-07-19

2011-07-19

Blount, Eric M (Department: 2612)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S540000, C340S542000, C342S027000

Reexamination Certificate

active

07982606

ABSTRACT:
The present invention is an alarm system that includes a dual technology motion sensor. The dual technology sensor includes a PIR sensor with a PIR detection pattern and a Doppler microwave frequency motion detector with a detection pattern wider than that of the PIR sensor. The microwave detector's processing circuitry distinguishes motion beyond the PIR detection pattern, and limits the microwave detector's field of view to match the PIR detector's detection pattern. The microwave detector has a transmitting antenna, two receiving antennas, and processing circuitry for processing received signals. The microwave detector's processing circuitry uses phase information from the two receiving antennas to distinguish motion beyond the PIR detection pattern.

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patent: 7079029 (2006-07-01), Tsuji
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patent: 7796033 (2010-09-01), Green et al.
patent: 2005/0043907 (2005-02-01), Eckel et al.
patent: 2008/0042832 (2008-02-01), DiPoala

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