基于双频通信的空间飞行器自组网动态时隙分配

Dynamic Time Slot Allocation of Space Vehicle Ad Hoc Network Based on Dual Frequency Communication

针对分布式空间飞行器自组网使用传统时分多址(Time Division Multiple Access,TDMA)时隙分配方式时网络时延大、传输效率不高的问题,提出了一种基于双频通信的动态时分多址时隙分配(Dual Frequency Dynamic Time Division Multiple Access,DF-DTDMA)方案。DF-DTDMA方案采用双频通信分别传输低速广播业务和高速定向业务,提高了网络吞吐量。在低频网络层提出了嵌套型时隙分配策略降低网络拓扑变化快带来的定向业务丢包率;在高频网络层提出了基于空间复用的定向无冲突时隙分配策略,避免发生信息碰撞,提高了网络的可靠性。仿真结果表明,相比传统TDMA协议,DF-DTDMA方案有效降低了飞行器网络丢包率,提升了网络吞吐量,具有高可靠性和灵活性。

For the problems of large network delay and low transmission efficiency due to applying the traditional time division multiple access(TDMA)slot allocation method in distributed space vehicle ad hoc network,a dynamicTDMA slot allocation scheme based on dual frequency communication(DF-DTDMA)is proposed.The DF-DTDMA scheme adopts dual frequency communication to transmit low-speed broadcast service and high-speed directional service respectively,which improves the network throughput.An embedded slot allocation strategy is proposed at the low-frequency network layer to reduce the packet loss rate of directional service caused by the rapid change of network topology.In the high frequency network layer,a directional collision free slot allocation strategy based on spatial multiplexing is proposed to avoid information collision and improve the reliability of the network.The simulation results show that compared with the traditional TDMA protocol,the DF-DTDMA scheme effectively reduces the aircraft network packet loss rate,improves the network throughput,and has high reliability and flexibility.