TY - GEN
T1 - SMCW Radar for Low if Sensing Applications
AU - Rodriguez, Daniel
AU - Vallejo-Montoya, Natalia
AU - Li, Changzhi
N1 - Publisher Copyright:
© 2022 IEEE.
PY - 2022
Y1 - 2022
N2 - Quadrature monostatic direct conversion receivers (homodyne) have been extensively studied for detecting slow, small amplitude motions such as vital signs. The main advantage of direct conversion monostatic receivers is the straightforward coherent sensing that mitigates the oscillator phase noise. However, any imbalance between the two channels introduce significant errors in the recovered displacement and additional flicker noise is introduced during direct down-conversion to DC and in the baseband amplification circuit. To overcome these problems, low intermediate frequency radars have been proposed. Nevertheless, they exhibit increased hardware complexity and non-straightforward coherent detection. A sinusoidally modulated continuous wave radar is proposed to combine the benefits of the homodyne and heterodyne architectures. A theoretical analysis has been presented and experimentally verified. Measurements using mechanical targets demonstrate signal to noise ratio improvements of up to 21.45 dB, when a 10 μm motion was measured at a distance of 100 cm.
AB - Quadrature monostatic direct conversion receivers (homodyne) have been extensively studied for detecting slow, small amplitude motions such as vital signs. The main advantage of direct conversion monostatic receivers is the straightforward coherent sensing that mitigates the oscillator phase noise. However, any imbalance between the two channels introduce significant errors in the recovered displacement and additional flicker noise is introduced during direct down-conversion to DC and in the baseband amplification circuit. To overcome these problems, low intermediate frequency radars have been proposed. Nevertheless, they exhibit increased hardware complexity and non-straightforward coherent detection. A sinusoidally modulated continuous wave radar is proposed to combine the benefits of the homodyne and heterodyne architectures. A theoretical analysis has been presented and experimentally verified. Measurements using mechanical targets demonstrate signal to noise ratio improvements of up to 21.45 dB, when a 10 μm motion was measured at a distance of 100 cm.
KW - Doppler radar
KW - low-IF
KW - mechanical vibration
KW - physiological signals
KW - radar sensors
UR - http://www.scopus.com/inward/record.url?scp=85127521544&partnerID=8YFLogxK
U2 - 10.1109/WiSNet53095.2022.9721372
DO - 10.1109/WiSNet53095.2022.9721372
M3 - Conference contribution
AN - SCOPUS:85127521544
T3 - 2022 IEEE Topical Conference on Wireless Sensors and Sensor Networks, WiSNeT 2022
SP - 22
EP - 25
BT - 2022 IEEE Topical Conference on Wireless Sensors and Sensor Networks, WiSNeT 2022
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2022 IEEE Topical Conference on Wireless Sensors and Sensor Networks, WiSNeT 2022
Y2 - 16 January 2022 through 19 January 2022
ER -