Research On Portable Life Detector System Based On ARM

The portable non-contact radar life detection system is an equipment to judge thepresence of life through analysis of the echo signals when the human can not directlytouch. The system can find the target quickly in military operations at night or streetfighting by extracting the vital signs of heartbeat, breathing and movement from the firedisaster, snow avalanche, debris flow towards unseen goals, which can improve theefficiency of searching works. Meanwhile, the system can be applied to clinical patientcare, warehouse security, the prison regulation and all aspects of society. This paper stateddesign of life detection system with Arm9as controller.Doppler frequency shift is the basic principle of life detection. The echo signal willbring the life signal after modulation of continuous radar wave to the lives of humanactivities. By echo signal processing we can judge whether the signal carry the vital signsof life which is characterized by breathing, heartbeat and body movement signals.In the realization of the system we firstly designed the continuous radar wavefront-end circuit including double-frequency conversion circuit and filter circuit, etc.Then we designed interactive communication module with FPGA. Finally, the power ratiowas calculated to judge the existence of life under embedded linux system which isrunning on ARM9processor and the man-machine interaction analysis results wasobtained to the user.The system can draw and detect life signals effectively more efficient, timely. Forreducing volume of the system and achieving high detection sensitivity, a further researchis put forward and the prospect of the development and application of life detection radarsystem are expected.