Anti-Interference Heartbeat Measurement Based on a Miniaturized Doppler Radar Sensor

<div>(a) <svg height="11.439pt" id="M96" style="vertical-align:-2.15067pt" version="1.1" viewbox="-0.0498162 -9.28833 20.4818 11.439" width="20.4818pt" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><g transform="matrix(.013,0,0,-0.013,0,0)"><path d="M405 650H141L135 622C222 616 230 610 215 535L133 116C118 41 113 33 29 28L23 0H289L295 28C209 33 205 40 219 116L298 535C312 609 317 616 399 622L405 650Z"></path></g><g transform="matrix(.013,0,0,-0.013,5.567,0)"><path d="M368 703H309L44 -163H104L368 703Z"></path></g><g transform="matrix(.013,0,0,-0.013,10.928,0)"><path d="M699 368C699 549 574 666 407 666C186 666 23 488 23 277C23 113 129 -3 288 -13L307 -26C431 -111 501 -139 533 -147C559 -154 613 -163 658 -164L666 -141C597 -111 507 -66 430 -11L416 -1C580 42 699 190 699 368ZM601 371C601 227 518 54 381 22L354 40L278 24C175 47 120 145 120 269C120 451 235 631 398 631C540 631 601 521 601 371Z"></path></g></svg> constellation and the 3 points chosen as DC offset for demodulation. (b) Demodulation result when the DC offset is at point 1. (c) Demodulation result when the DC offset is at point 2. (d) Demodulation result when the DC offset is at point 3.</div>

Advances in Mathematical Physics

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Figure 10

Figure 10: Anti-Interference Heartbeat Measurement Based on a Miniaturized Doppler Radar Sensor 