Fig. 1. APFFT time-shifted phase difference (N = 6).

Fig. 2. Relative errors with APFFT and single-point correction FFT for (a) speed and (b) distance measurements.

Fig. 3. Experimental setup.

Fig. 4. (a) Example of FMCW SMI signal within one period and (b) signal after removing the triangular modulation waveform.

Fig. 5. Results of distance measurement.

Fig. 6. Results of speed measurement.

Fig. 7. Results of simultaneous distance and speed measurements for linear movement. (a) Measurement results and (b) relative errors.

Fig. 8. Results of simultaneous distance and speed measurements for sinusoidal movement. (a) Measurement results and (b) relative errors.