Determining presence and/or physiological motion of one or more subjects with quadrature doppler radar receiver systems
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United States of America Patent
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Issued Date -
May 22, 2008
app pub date -
May 14, 2007
filing date -
May 17, 2006
priority date (Note) -
Abandoned
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Abstract
Systems and methods for determining presence and/or physiological motion of at least one subject using a Doppler radar system having a quadrature receiver are provided. In one example, the apparatus includes a transmitter for transmitting a source signal, a quadrature receiver for receiving the source signal and a modulated source signal (e.g., as reflected from one or more subjects), and logic for mixing the source signal and the received modulated source signal to generate in-phase (I) and quadrature (Q) data, whereby nulls in the signal are avoided. In one example, the quadrature receiver further includes logic for center tracking quadrature demodulation. The apparatus may further include logic for determining physiological motion (e.g., heart rate and/or respiration rate of a person) of a subject based on the source signal and the modulated source signal.
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