Fig. 1. Propagation process of light in rotating double prism system

Fig. 2. Optimized minimum error evaluation function value in the case of different initial values

Fig. 3. Error correction experiment platform of Risley prisms. (a) Schematic; (b) physical map

Fig. 4. Theoretical points selected on light screen

Fig. 5. Deviation of theoretical and actual points before correction. (a) Deviation of theoretical and actual points on light screen; (b) deviation of theoretical and actual points in different positions

Fig. 6. Deviation of theoretical and actual points after overall correction. (a) Cost function of error varies with iterations; (b) deviation of theoretical and actual points on light screen; (c) deviation of theoretical and actual points in different positions

Fig. 7. Beam pointing deviation at different azimuth and pitch angles

Fig. 8. Deviation of theoretical and actual points after adding the correction for the error of initial incident beam relative to ideal optical axis. (a) Cost function of error varies with iterations; (b) deviation of theoretical and actual points on light screen; (c) deviation of theoretical and actual points in different positions

Fig. 9. Deviation of theoretical and actual points after individually correcting the points whose pitch angle is less than 15°. (a) Cost function of error varies with iterations; (b) deviation of theoretical and actual points on light screen; (c) deviation of theoretical and actual points in different positions

Table 1. Maximum pointing deviation caused by some error sources to different fields of view of rotating Risley prisms