Fig. 1. Schematic of the laser ranging system based on the PRC phase modulation and coherent detection

Fig. 2. Principle diagrams of (a) when the delay doesn't match the target range and (b) when the delay matches the target range

Fig. 3. (a) Experimental system diagram; (b) targeted aluminum plate

Fig. 4. Coherent signal sampled by ADC channel 1

Fig. 5. Amplitude spectrum of the multiplication signal. (a) Delay doesn't match the target distance; (b) delay matches the target distance

Fig. 6. Relationship between the peak value of the Y amplitude spectrum and the distance corresponding to the different time delays

Fig. 7. 50 times detection results after core amendment