Fig. 1. Research steps of aero-optical effects

Fig. 2. Installation positions of airborne optical terminal^[18-21]. (a) Bottom of the fuselage; (b) sides of the fuselage; (c) forward fuselage; (d) conformal window on the side of the fuselage

Fig. 3. Schematic of the flow around the hemispherical turret^[22]. (a) Side view; (b) top view

Fig. 4. Schematic of the flow around the cylindrical-hemispherical turret^[28]. (a) Transonic speed; (b) supersonic speed

Fig. 5. 2D diagram of equal step grid ray tracing method

Fig. 6. Passive flow controller^[60-61]. (a) Large vortex breakup devices; (b) perforated screens

Fig. 7. Schematic diagram of jet actuator on cylindrical-hemispherical turret^[62]. (a) Side view; (b) top view

Fig. 8. Schematic diagram of the correction strategy designed to correct aero-optical effects of the mixing layer based on periodic pulse control^[71-72]

Fig. 9. Close-loop controller with predictive wave-front block^[58]

Fig. 10. Schematic diagram of the airplane-to-satellite link

Fig. 11. Performance of peak tracking and centroid tracking algorithms at different azimuth and elevation angles^[88]

Fig. 12. AAOL receiver^[89]

Fig. 13. Concept diagram of far-field intensity drop-outs^[93]

Fig. 14. Outage probability versus average signal-to-noise ratio^[94-95]. (a) Weak turbulence conditions; (b) moderate turbulence conditions

Fig. 15. Relationship between transmission distance and beam width^[99]. (a) Different heights; (b) different wavelengths

Fig. 16. Compensation effects of lenses with different focal lengths^[105]

Fig. 17. Recent research progress in airborne quantum secure communications

Fig. 18. Airborne QKD performance evaluation procedure under aero-optical effects^[111]

Fig. 19. Schematic diagram of the distance from the boundary layer to the receiver for both link cases^[112]

Fig. 20. Impact of aero-optical effects on the transmitter^[113]

Fig. 21. Schematic diagram of ground-air airborne QKD^[111]. (a) Main view; (b) top view

Fig. 22. Azimuth angle, deflection angle, and drifted offset over the flight time^[111]. (a) Azimuth angle; (b) deflection angle of transmitted photons; (c) drifted offset of the beam, which reaches the receiver

Fig. 23. Impact of aero-optical effects on the receiver^[113]

Fig. 24. Schematic diagram of satellite-to-aircraft quantum communication link^[112]

Fig. 25. Performance of satellite-to-aircraft link over the communication time^[112]. (a) Total loss; (b) QBER; (c) secure key rate

Fig. 26. Impact of aero-optical effects on receiver and transmitter^[113]

Fig. 27. Schematic diagrams of the co-directional flight model and counter-directional flight model^[113]. (a) Co-directional flight model; (b) counter-directional flight model