Wireless Sleep Apnea Detection Using Continuous Wave Quadrature Doppler Radar

A non-contact and non-invasive physiological radar monitoring system (PRMS) is introduced. The system is based on motion detection using quadrature microwave Doppler radar, eliminating the need to place sensors on the body. An algorithm was designed to perform real-time actigraphy and sleep apnea detection. The system was validated with clinical polysomnography(PSG) in a sleep study facility on ten consented volunteers with known obstructive sleep apnea. Data obtained from both PRMS and clinical PSG systems were rated by a sleep technician and show an excellent agreement in the detected apnea and hypopnea events. The apnea-hypopnea events were distinguished with an overall sensitivity of 86%, the specificity of 91% and accuracy of 92%.