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Continuous respiration monitoring is significant for real-life healthcare applications, but realizing it is extremely hard as wearable sensors are cumbersome and contact-free sensors largely fail to tolerate user movements. Meanwhile, tracking users indoors mostly demands user-held devices, while device-free localization can barely tell what and who it tracks. Fortunately, as both contact-free respiration monitoring and device-free localization may rely on Radio-Frequency (RF) sensing, fusing them together creates a novel system capable of continuously tracking users while recovering their fine-grained respiratory waveforms. To this end, we propose BreathCatcher as a continuous human respiration tracking system for indoor applications. To build this system, we employ commercial-grade compact radar pairs to capture RF reflections containing respiratory signals. We then propose a hybrid human respiration and …