| The vital signs detection based on continuous-wave radar technology is an important technical means in the field of life detection.It uses the Doppler effect of radar waves induced by breathing and heartbeat to detect non visible and non-contact targets in complex environment.By using the filter and time-domain signal detection method,the target's heartbeat and respiratory frequency can be finally got for related results discrimination.This paper is based on the detection of life signal in complex environment,which aims to solve the interference of clutter which affects the detection results.In this paper,the related hardware auxiliary circuit to collect signal is designed,and study the removal of clutter in vital signs.By establishing the radar echo model,the main interference sources in the vital signs signal detection are analyzed,including system error,human swing and environmental error.Because of the low frequency characteristics of breathing and heartbeat signals,IIR filter and wavelet transform filter with steep transition band are designed.Also the harmonic suppression algorithm is designed to prevent the interference of respiratory signal to heartbeat signal.The effectiveness of the methods mentioned above are proved by sufficient experiments. |
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