Journal
ELECTRONICS LETTERS
Volume 47, Issue 21, Pages 1196-U59Publisher
INST ENGINEERING TECHNOLOGY-IET
DOI: 10.1049/el.2011.2419
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Funding
- NSFC [61071063, 61131002]
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A voltage-controlled tunable phase shifter is introduced in the architecture of a microwave Doppler radar to eliminate the null point problem in the non-contact vital sign detection. With a simple control mechanism, the phase of the demodulated signal can be effectively adjusted, providing an opportunity to always lock the radar system to the optimum point. Experiment demonstrates that such a method results in a significant improvement in measurement accuracy.
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