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In the past decades, continuous Doppler radar sensor-based bio-signaldetections have attracted many research interests. A typical example is theDoppler heartbeat detection. While significant progresses have been achieved,reliable, time-domain accurate demodulation of bio-signals in the presence ofunavoidable DC offsets remains a technical challenge. Aiming to overcome thisdifficulty, we propose in this paper a novel demodulation algorithm that doesnot need to trace and eliminate dynamic DC offsets based on approximatingsegmented arcs in a quadrature constellation of sampling data to directionalchords. Assisted by the principal component analysis, such chords and theirdirections can be deterministically determined. Simulations and experimentalvalidations showed fully recovery of micron-level pendulum movements andstrongly noised human heartbeats, verifying the effectiveness and accuracy ofthe proposed approach.

Time-Domain Doppler Biomotion Detections Immune to Unavoidable DC Offsets