Fig. 1. The schematic diagram of reference-beam LDV

Fig. 2. Doppler frequency corresponding to different angles

Fig. 3. The relationship between normalized SNR and incidence angle

Fig. 4. The relationship between velocity measurement sensitivity and incidence angle

Fig. 5. The relation between the relative error caused by the velocity measurement resolution and the launch inclination

Fig. 6. Schematic diagram of finite aperture error of detector

Fig. 7. Variation of relative error with launch inclination

Fig. 8. Variation of relative error caused by velocity resolution with measured velocity at different angles

Fig. 9. Comparison of relative errors caused by velocity measurement resolution