Fig. 1. Schematic structure of coherent detection system

Fig. 2. Spectrum simulation comparison diagram of different phase perturbations with ideal signal. (a) Spectrum of ideal signal and white Gaussian noise; (b) spectrum of ideal signal and linear frequency drift

Fig. 3. Curves of phase variance and integration time of ideal noiseless signal, white Gaussian noise, and linear frequency drift

Fig. 4. Simulation curves of integration time and detection accuracy of ideal system and frequency drift system

Fig. 5. Structure of common coherent detection system

Fig. 6. Structure diagram of local oscillation tunable coherent lidar simulation for speed measurement

Fig. 7. Flowchart of phase compensation

Fig. 8. Curve of integration time and Strehl ratio

Fig. 9. Spectrum diagram of different integration times; (a) 0.7 ms integration time; (b) 7.0 ms integration time

Fig. 10. Curves diagram of emitted signal power versus detection probability at coherent time of 0.7 ms. (a) Reference signal and experiment data; (b) reference signal and experiment data with phase compensation

Fig. 11. Curves diagram of integration time versus signal-to-noise ratio at 11 fW signal power. (a) Reference signal and experiment data; (b) reference signal and experiment data with phase compensation

Fig. 12. Curves diagram of integration time versus speed accuracy. (a) Reference signal and experiment data; (b) reference signal and experiment data with phase compensation