Abstract
AbstractA continuous‐wave (CW) Doppler radar using two‐tone frequencies is presented for the measurement of short‐range distance. The envelope detection method is proposed to discriminate each frequency signal in the output waveform of the two‐tone CW Doppler radar sensor. The phase difference in each frequency is obtained from the nonlinearly demodulated I/Q baseband signals, following calibration of the I/Q imbalance and DC offset voltages. The absolute distance is derived from the phase differences at the two‐tone frequencies with a 100 MHz spacing. The measurement results in the two‐tone radar system show a maximum error of 2.5 cm in the 20 to 50 cm distance range.
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