Determining presence and/or physiological motion of one or more subjects within a doppler radar system
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United States of America Patent
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Issued Date -
Mar 27, 2008
app pub date -
May 14, 2007
filing date -
May 17, 2006
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
Systems and methods for detecting presence and/or physiological motion of at least one subject using a Doppler radar system and determining a number of subjects within range are provided. In one example, the apparatus includes a receiver for receiving a transmitted source signal, the transmitted source signal modulated by at least one subject, logic for mixing the received transmitted signal and a local oscillator signal, and logic for performing a Generalized Likelihood Ratio Test (GLRT) on the mixed signal to determine a number of subjects modulating the signal. Additionally, the receiver may include a quadrature receiver operable 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.
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