Fig. 1. Schematic diagram of phase laser ranging

Fig. 2. Diagram of all phase FFT phase discrimination (N=4)

Fig. 3. Principle block diagram of undersampling apFFT phase detection

Fig. 4. (a) Phase detection performance with different sampling frequency at signal frequency of 201 MHz; (b) Phase detection performance with different sampling frequency at signal frequency of 301 MHz

Fig. 5. Phase discrimination performance under different signal frequencies

Fig. 6. Measurement performance with different SNR

Fig. 7. Measurement performance with frequency offset

Fig. 8. (a) Phase detection performance with various factors of undersampling FFT method; (b) Phase detection performance with various factors of undersampling apFFT method

Fig. 9. (a) Hardware scheme block diagram of under-sampling phase detection system; (b) Actual circuit diagram of undersampling phase discrimination system

Fig. 10. (a) Phase detection accuracy with different white Gaussian noise of FFT methods based on phase discriminator circuit; (b) Phase detection accuracy with different white Gaussian noise of apFFT methods based on phase discriminator circuit

Fig. 11. Phase detection accuracy with different phase differences based on phase discriminator circuit

Fig. 12. Experimental system of phase laser ranging

Fig. 13. Phase discrimination results comparison diagram with Kalman filtering or not