Fig. 1. Layout sketch of velocity measurement system

Fig. 2. Numbers of target local exposures in single frame when tm≤tf

Fig. 3. Numbers of target local exposures in the first frame when tm>tf

Fig. 4. Numbers of target local exposures in the last frame when tm>tf

Fig. 5. Numbers of target local exposures in a middle frame when tm>tf

Fig. 6. Model of monocular vision positioning

Fig. 7. Moving target in galvanometer coordinates

Fig. 8. Imaging model for local exposure

Fig. 9. Velocity measurement errors at different target velocities

Fig. 10. Relative velocity measurement error at different target velocities

Fig. 11. Maximum numbers of local exposures under different target velocities

Fig. 12. Local exposure track of galvanometer scanning

Fig. 13. Moving target obtained by multiple partial exposures in a single frame. (a) Experiment1; (b) experiment2

Fig. 14. Results of target velocity measurement

Fig. 15. Relative velocity measurement error (take initial velocity as true value)

Fig. 16. Relative velocity measurement error (take the average velocity as the true value)