Fig. 1. Absolute error of simulation data before and after autocorrelation detection when the velocity is 30 m/s at two SNRs. (a) SNR=-10 dB; (b) SNR=-20 dB

Fig. 2. Absolute error of simulation data of the three methods for velocity measurement when the SNR is -20 dB at two speeds. (a) Speed is 30 m/s; (b) Speed is 60 m/s

Fig. 3. Structural diagram of laser Doppler velocity measurement system

Fig. 4. Flow chart of signal processing

Fig. 5. Comparison of absolute error of experimental data using different methods.(a) Velocity is 30 m/s; (b) Velociy is 60 m/s

Fig. 6. On-site speed measurement scene

Fig. 7. Speed continuous collection on wire production site. (a) Set velocity 4 m/s; (b) Set velocity 40 m/s