Fig. 1. Network topology of space laser communication network

Fig. 2. Structure of optical transceiver system

Fig. 3. Structure of main optical transceiver

Fig. 4. Structure of slave optical transceiver

Fig. 5. Overall control scheme of slave optical transceiver

Fig. 6. Strapdown stability control principle

Fig. 7. Strapdown system control scheme

Fig. 8. Frequency characteristic experiment of azimuth axis from slave optical transceiver

Fig. 9. Frequency characteristic test of azimuth axis. (a) Amplitude frequency characteristic curve; (b) phase frequency characteristic curve

Fig. 10. Frequency characteristic identification of azimuth axis. (a) Amplitude frequency identification curve; (b) phase frequency identification curve

Fig. 11. Structure of tracking differentiator (TD)

Fig. 12. Tracking error of PD control under differential velocity measurement

Fig. 13. Tracking error of PD control with nonlinear tracking differentiator

Fig. 14. Bode diagram of tracking system. (a) Amplitude frequency characteristics; (b) phase frequency characteristics

Fig. 15. Hardware composition of airborne photoelectric pod in slave optical transceiver

Fig. 16. Experiment on coarse tracking control of slave optical transceiver in network

Fig. 17. Azimuth axis tracking error under differential velocity measurement

Fig. 18. Azimuth axis tracking error in differential velocimetry