应用于无人机中继测控链路的微波前端设计

Design of Microwave Front-end for UAV Relay TT&C Data Link

当前无人机测控数据链系统多为点对点视距传输,当遇到需要扩展通信距离或存在障碍物遮挡时往往限制了链路的正常工作。针对此问题,提出了一种应用于无人机中继测控链路的微波前端设计方案。其空空链路与空地链路采用频率倒置的频分双工体制,有效避免了前向链路与返向链路的收发干扰,并实现了机载设备的硬件统型;通过软件注入便可完成对终端模式的在线切换,提升了系统应用的灵活性与鲁棒性,为保证复杂环境下无人机测控链路的实时传输提供了一种有效的解决途径。

Because most of current telemetry,tracking and command( TT&C) data link systems for unmanned aerial vehicles( UAVs) are point-to-point line-of-sight transmission,the function of the link system is often limited when encountering the need to extend communication distance or obstacle in existence.To solve the problem,a microwave front-end design scheme for UAV relay TT&C data link is proposed.In the scheme,a frequency division duplex system with frequency inversion for its air-to-air link and air-to-ground link is adopted,thus effectively avoiding the interference of forward link and backward link,as well as realizing the hardware unification of airborne equipment.The on-line switching of terminal mode is accomplished through software injection so as to improve the flexibility and robustness of system application,which provides an effective solution to ensure the real-time transmission of UAV TT&C link in complex environment.