| 摘要: |
| 针对中、高空长航时无人机超视距通信系统普遍采用Ku频段卫星中继存在信号可用带宽有限、干扰源众多、机载端设备较大的现状，提出了一种基于Ka频段卫星的无人机超视距通信系统总体与分系统工程实现方案，并给出了关键设计要素。在详细推导链路计算公式基础上，以前向速率为51.2 kb/s、返向速率为8 Mb/s为例进行了链路余量预算与数值仿真分析，并与传统Ku频段方案在传输速率、抗干扰能力、天线口径等方面进行了分析比较。结果表明，在同等条件下所设计的系统性能可提高20%左右。飞行试验结果验证了该方案的合理性、可行性、有效性和工程可实现性，为无人机超视距通信系统总体设计和工程实现提供了思路与参考。 |
| 关键词: Ka频段 无人机 超视距通信 链路计算 |
| DOI： |
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| 基金项目:国家自然科学基金资助项目(61501366) |
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| A UAV-borne over-the-horizon communication system |
| WANG Le,WU Ping,HU Mi |
| (Xi′an Institute of Space Radio Technology,Xi′an 710100,China) |
| Abstract: |
| Because Ku-band satellite relay is adopted,there are many problems in the over-the-horizon communication system of high-altitude long-endurance unmanned aerial vehicle(UAV),such as limited available signal bandwidth,numerous interference sources and large airborne terminal equipment.For this situation,a new overall and sub-system realization scheme for UAV over-the-horizon communication system based on Ka-band satellite is proposed and a few key design elements are given as well.With detailed derivation of the link calculation formula,by taking the forward rate of 51.2 kb/s and the return rate of 8 Mb/s for example,link budget and numerical simulation analysis are performed.Comparison with the traditional Ku-band scheme in transmission speed,anti-interference capability and antenna aperture indicates that the performance of the designed system can be improved by about 20%.The rationality,feasibility,effectiveness and engineering feasibility of the scheme is verified by flight test,which provides the thought and reference for the overall design and engineering implementation of UAV-borne over-the-horizon communication system. |
| Key words: Ka-band unmaned aerial vehicle(UAV) over-the-horizon communication link calculation |
