Fig. 1. Relationship between detection distance and received power of detector

Fig. 2. Effects of echo pulse amplitudes on judgment results

Fig. 3. Schematic of laser ranging system. (a) Overall block diagram of laser ranging system; (b) picture of laser ranging system

Fig. 4. Differential circuit used in peak detection. (a) Schematic of differential circuit; (b) output waveform of differential circuit

Fig. 5. Schematic of peak detection shaping method

Fig. 6. Waveform analysis of peak detection shaping circuit

Fig. 7. Schematic of constant-ratio timing pulse shaping under different input signal amplitudes. (a) Unsaturated input signal; (b) saturated input signal

Fig. 8. Waveform analysis of constant-ratio timing shaping circuit

Fig. 9. Input signal of peak detection circuit. (a) Received and amplified signal in the peak detection circuit; (b) signal after differential circuit

Fig. 10. Output signal of peak detection circuit. (a) PECL signal output by the comparator in the peak detection circuit; (b) TTL signal output by the shaping module in the peak detection circuit

Fig. 11. Test results of constant-ratio timing circuit. (a) PECL signal output by the comparator in the constant-ratio timing circuit; (b) TTL signal output by the shaping module in the constant-ratio timing circuit