A hybrid life detection radar system which transmits a wideband chaotic signal containing\nan embedded single-tone is proposed. The chaotic signal is used for target localization by the\ntime-domain correlation method and synthetic aperture technique, and the single-tone signal is used\nto measure the frequencies of breathing and heartbeat based on an on-chip split-ring integrated sensor\nand Michelson interference principle. Experimental results in free space and in through-wall scenarios\ndemonstrate that the system can realize human detection and localization simultaneously with\nhigh range resolution, high sensitivity, and large dynamic range without complex signal processing.\nThe range resolution is about 10 cm, and the dynamic range is 35 dB for the respiration signal detection\nand 25 dB for the heartbeat signal detection. Due to its good immunity to interference/jamming and\nhigh spectrum efficiency, the proposed system is suitable for post-disaster rescue, elder/infant/patient\nvitality monitoring, and anti-terrorism enforcement applications.
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