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针对可见光通信环境的复杂多样性以及传统光学接收天线应用的局限性,设计了一种可变焦光学天线作为移动可见光通信系统的接收天线。通过引入直角反射棱镜折叠空间光路的方法减小天线的厚度,且该天线各透镜面型均为球面,较大地节约了系统成本。仿真分析结果显示:系统的变倍比为2.5倍,视场角可以在16°~42°之间连续变化,最大增益可达16.2,系统尺寸为18 mm×6 mm,探测面照度均匀且相对照度较高,满足通信应用。最后,在5 m×5 m×3 m的通信环境中对变焦天线和定焦天线在不同应用场景下的接收性能进行了对比分析。分析结果表明,变焦光学接收天线满足大视场高增益要求的同时,在系统的稳定性、移动性和环境适用性方面明显优于定焦光学天线,非常适于可见光通信应用。
Aiming at the complexity of the visible light communication environment and the limitation of the application of the traditional optical receiving antenna, a variable-focus optical antenna is designed as the receiving antenna for mobile visible light communication system. The method of folding the space optical path by introducing a right-angle reflecting prism reduces the thickness of the antenna, and the surface shape of each lens of the antenna is a spherical surface, which greatly saves the system cost. The simulation results show that the zooming ratio of the system is 2.5 times, the angle of field can continuously change from 16 ° to 42 °, the maximum gain can reach 16.2, the system size is 18 mm × 6 mm, the illuminance of the detection surface is uniform and relative High illumination, to meet the communication applications. Finally, the receiving performance of the zoom antenna and the fixed focus antenna under different application scenarios are compared and analyzed in the communication environment of 5 m × 5 m × 3 m. The analysis results show that the zoom optical receiver antenna is superior to the fixed focus optical antenna in terms of stability, mobility and environmental suitability of the system while satisfying the requirement of large field of view high gain, which is very suitable for the application of visible light communication.