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针对有人/无人直升机卫星通信系统信号被旋翼遮挡导致链路中断的问题,根据对前向链路和返向链路数据速率、可靠性等方面的不同要求,分别提出一种对抗旋翼遮挡的方法。即前向链路采用时间发射分集技术,保证了数据传输的可靠性;返向链路采用基于信号功率的缝隙检测方法确定无遮挡区间,利用无遮挡缝隙进行数据回传,提高了通信效率。仿真结果表明,这种方法可以有效地对抗旋翼遮挡,技术方案可行有效,具有广阔的示范应用前景。
Aiming at the problem that the signals of manned / unmanned helicopter satellite communication system are intercepted by the rotors, this paper presents a new scheme that is based on the different requirements on the data rate and reliability of the forward link and the reverse link. method. That is, the forward link adopts the time transmit diversity technology to ensure the reliability of data transmission. The backward link uses the signal power based gap detection method to determine the unobstructed interval, and uses the unobstructed gap for data return to improve the communication efficiency. The simulation results show that this method can effectively shield the rotor from obstruction, the technical scheme is feasible and effective, and has a broad prospect of demonstration application.