Mentioned by U.S. Pat. No. 4,697,184 proposes emitting a microwave signal containing alternating frequencies and deriving from the signal reflected by an object in the room under surveillance first and second Doppler signals that have a phase difference proportional to the distance of the object.
The present invention is therefore intended to provide a microwave motion detector in which the interferences mentioned, such as multi-path interference, are reliably suppressed. The present invention is also intended to provide enhanced detection parameters, such as target velocity, expected position and the like.
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