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为了在现有条件下对无人机遂行对地光通信任务的调制传输速率有一个准确的衡量,需要建立合适的机载光通信大气信道模型。首先划分空域范围,将影响要素限定在对流层内;之后基于对流层典型大气效应建立了综合影响模型,又进一步建立了无人机对地光通信的信道传输模型。在现有条件下进行无人机参数设置,并对不同高度条件下无人机对地光通信的有效信息总量进行仿真,得到了遂行光通信任务的最佳通信高度为2 660 m;在此高度条件下,通过选取合适调制速率点对信道传输模型进行仿真。结合临界有效信息总量的设置及仿真结果,在满足光通信系统反馈检验需求的基础上,将无人机光通信临界调制速率需求锁定在1.12 Gbps。为现有条件下光通信调制系统的设计提供了评估标准,具有较强的指导意义。
In order to have an accurate measurement of the modulation transmission rate of UAVs to optical communication tasks under the existing conditions, it is necessary to establish a suitable atmospheric channel model for airborne optical communications. Firstly, the airspace range is divided and the influencing factors are confined in the troposphere. Then, a comprehensive impact model is established based on the typical atmospheric effects in the troposphere, and the channel transmission model of UAV to geo-optical communication is further established. Under the existing conditions, the parameters of UAV are set, and the total effective information of UAV to ground optical communication under different heights is simulated. The optimal communication height is 2 660 m. Under this condition, the channel transmission model is simulated by selecting the appropriate modulation rate. Based on the setting of the total critical effective information and the simulation results, the critical modulation rate of UAV optical communication is locked at 1.12 Gbps based on the feedback inspection requirements of optical communication system. It provides an evaluation standard for the design of optical communication modulation system under the existing conditions and has strong guiding significance.