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

<div>(a) <svg height="11.439pt" id="M94" 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 of biosignal when the subject tries to keep still. (b) Demodulation results in time domain by two methods: with segmentation or with fixed DC offset. (c) Demodulation results in frequency domain by two methods: with segmentation or with fixed DC offset.</div>

Advances in Mathematical Physics

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Figure 9

Figure 9: Anti-Interference Heartbeat Measurement Based on a Miniaturized Doppler Radar Sensor 