Key Technology And Design Of Near Ground Non-strict Aim Free Space Ultraviolet Communication

With the rapid development of military communications, the sharp increase indemand for bandwidth and increasing demands of communication flexibility, privacy,traditional radio communications, optical fiber communications and infrared opticalcommunication can not meet the current demand for military communications.For the above problem, according to the characteristics of UV communicationsof flexible, high confidentiality, strong anti-jamming ability, wide bandwidth, highdata transfer rates, a full range around-the-clock, studying the key technologies ofnear ground non-strict alignment of ultraviolet free space communication system,made a overall technology design for a near ground non-strict aim UV free spacecommunication system.First, explained the basic principle of ultraviolet communication system，proposing system working band, emission light power, receiver sensitivity, signal tonoise ratio and bit error ratio, communication rate and distance and other maintechnical performance, studying theory of non-line-sight ultraviolet communicationequations, high-performance UV-detector signal detection， modulation anddemodulation, ultraviolet signal detecting, ultraviolet optical systems and other keytechnologies, identified the issue focused on two key technologies: theory ofnon-line-sight ultraviolet communication equations and ultraviolet optical systems.Second, on the basis of studied on non-line-sight single scattering, establishingnon-line-sight communication distance equation, simulated and discussed the impactof atmospheric factors, emission and receive elevation angle, emission field, receivefield, optical system performance, detector gain, SNR and BER on the communicationdistance. The resust showed that the impact of emission elevation angle and receivefield effect on the communication distance is large, the impact of emission elevationangle and receive field on the communication distance is relatively small, and theimpact of atmospheric factors, optical system performance, detectors gain, SNR andBER on the communication is great. On this basis, designed the exit pupil diameter of100mm ultraviolet emission optical system and the diameter of200mm off-axis threeanti form ultraviolet received optical systems.Finally, under system requirements, selected semiconductor laser light as systemlight source, absorption filters filtering out background light, photomultiplier tubes as detectors, completed the overall design of the system.In theory, this topic made innovative research on UV free space opticalcommunication system, as well as the overall system design, and had an importantrole in reducing UV light communication’s blindness of the research and design work,provided a theoretical basis and technical guidance for UV light communicationapplied in future development of military communication.