# Frequency-Tracking CW Doppler Radar Solving Small-Angle Approximation and Null Point Issues in Non-Contact Vital Signs Monitoring

> Research article (IEEE Transactions on Biomedical Circuits and Systems, 2017) · cited 72× · AI/ML

**Wikidata**: [openalex:W2602005861](https://www.wikidata.org/wiki/openalex:W2602005861)  
**Source**: https://4ort.xyz/entity/frequency-tracking-cw-doppler-radar-solving-small-angle-approximation-and-null-point-issues-in-non-contact-vital-signs-m