Life Detecting Radars

摘要

Systems and methods for detecting biometrics using a life detecting radar are disclosed. Life detecting radars can include transmit antennas configured to transmit continuous microwave (“CW”) radio signals that reflect back upon making contact with various objects. The signal can be systematically varied in frequency to provide a signal that is essentially continuous with short gaps between transmissions at different frequencies. The reflected return signals are received by one or more receive antennas and processed to detect one or more targets. The received signal can include a static (i.e. constant phase) signal corresponding to reflections from objects that do not move. The received signal can also include a phase varying signal that corresponds to reflections from a living target having measurable biometrics including (but not limited to) breathing patterns and heartbeats. Clutter can be removed and the remaining portions of the received signal are analyzed for target detection.

主权项

1. A life detecting radar comprising:
at least one transmit antenna configured to propagate at least one beam using a continuous wave transmit signal set at a plurality of frequencies, where the at least one beam illuminates at least one sensing area; at least one receive antenna configured to receive a return signal associated with reflections from objects of the at least one transmit signal within the at least one sensing area, where the return signal comprises at least one signal component having static phase associated with reflections from nonmoving objects and at least one signal component having time varying phase associated with at least one target; a processor; a memory containing a radar application, wherein the radar application configures the processor to:
receive the return signal from the at least one receive antenna;determine a static phase component of the return signal;generate a cancellation signal by sampling at least one transmit signal and modulating the sampled signal such that the phase and amplitude of the cancellation signal is adjusted to match an estimated phase and amplitude of the static phase component of the return signal;process the return signal by subtracting the cancellation signal to attenuate the at least one signal component having static phase; anddetect the at least one target by analyzing the at least one signal component having time varying phase for a biometric identifier by:
transforming the processed return signal from a frequency to a time domain data set;generating range bins, where each range bin has a sequence of samples taken from the time domain data set;analyzing each range bin for unique targets by examining a band limited version of the processed return signal for repetitive characteristics; andmatching the repetitive characteristics to a biometric identifier of a human.