Abstract: A system and method to compensate for transit-induced vibration when detecting heart rate using radar sensors is provided. Embodiments provide a radio frequency RF sensor for heart rate detection when a subject is in transit (e.g., in a vehicle and/or subject to human-induced motion), where the RF sensor is designed to cancel vibration noise while preserving a cardiac signal in a radar response so that a heart rate, respiratory rate, and related physiological parameters of a subject under test can be extracted. In some examples, a heart rate variability (HRV) and/or state of the subject under test can be derived from these physiological parameters as well. The RF sensor with vibration cancellation can be installed in multiple locations in a vehicle, including a car seat, a steering wheel, a roof of the vehicle, a visor, or a rearview mirror; alternatively, the components may be held or worn by a subject, or arranged proximate to a subject.

Abstract: A method for remotely sensing cardiac-related data of an animal subject includes transmitting a RF signal to impinge on tissue of the subject, receiving a reflected portion of the RF signal, generating baseband data, filtering baseband data (e.g., including high pass filtering), performing waveform phase position determination, performing at least one auto-correlation of the waveform phase position determined data, determining periodicity of the auto-correlated data, and (i) computing heart rate using a maximum periodicity of the periodicity, or (ii) identifying abnormalities in cardiac function, such as may be indicated by temporal variations in heart rate and/or signal amplitude corresponding to cardiac activity. Multiple bandpass filtering schemes may be employed.