Previously, detection systems used radar, which is expensive and not particularly sensitive to human beings.
此前汽车探测系统所使用的雷达不仅价格昂贵而且对人体探测并不敏感。
In the system of radar, Doppler frequency is very sensitive to the coding signal.
雷达系统中，相位编码信号对多普勒频率非常敏感。
In the system of radar, Doppler frequency is very sensitive to the coding signal.
雷达系统中，相位编码信号对多普勒频率非常敏感。
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