Short Wavelength: ~5mm wavelength is exquisitely sensitive to micro-movements, detecting millimeter-scale displacements. Fine Doppler Resolution: Highly responsive to the tiny Doppler shifts caused by periodic chest movement (breathing, 0.1-0.5Hz) and heart pulsations (~1Hz). Low Noise Floor: This frequency band has minimal environmental clutter and strong immunity to common EMI.
Clutter Suppression: Filters out static reflections from walls and furniture. Vital Sign Extraction: Uses time-frequency analysis (e.g., STFT) and pattern recognition to isolate respiration and heartbeat harmonics—the signatures of life. Presence Logic: Continuous detection of valid vital signs triggers an “Occupied” state. Absence of signals beyond a threshold triggers “Vacant.”
