Fig. 1. Schematic of ranging calculation principle

Fig. 2. Schematic of triangular-wave amplitude modulation

Fig. 3. Flow chart of algorithm for signal processing of triangular-wave modulation laser ranging system

Fig. 4. Effects of amplitude modulation index and waveform modulation on signal-to-noise ratio and correlation coefficient after noise reduction. (a) Effects on signal-to-noise ratio; (b) effects on correlation coefficients after noise reduction

Fig. 5. Schematic of triangular-wave modulation laser ranging system

Fig. 6. Amplitude-frequency diagram by different signal processing

Fig. 7. Fitting results of triangular-wave return signal. (a) Fitting residual between measured value of triangular-wave and regression value of linear model; (b) fitting variance varied with the ratio of discarded fitting data points

Fig. 8. Distance measurement mean square error with respect to detection distance