优化信道虚拟调度在航天器上的应用仿真

Simulation on the Application of Optimizing Virtual Channel Scheduling in Spacecraft

在大范围航天器通信虚拟信道中,不同类型信道数据源传递过程采用复用制,在多个信息同时抢占信道的情况下,会出现大数据量信道垄断信道问题,传统动态航空器信道调度算法主要面向特定星上数据源设计的,不能满足不同星上数据源传递时的信道抢占和垄断信道的需求,虚拟信道调度效果不好。提出利用帧紧迫度的边界可移动虚拟信道调度算法,分别运算信道的紧迫度和数据帧紧迫度,通过数据帧紧迫度边界调控二者的比重,塑造新的信道传递紧迫度函数,针对不同种类的航空器星上数据源,选择合理数据帧紧迫度边界值,获取较好的信道传递紧迫度函数,并分析两种重调情形,完成虚拟信道判决调度。实验结果说明,改进算法能够满足不同数据源的传递需求,提高了航空器虚拟信道调度效率和精度。

In extensivenessvirtual channelof spacecraft communication, multiplexing system is adopted in the transmission process of data source in different types of channels , . In the case of multiple information preempting channel at the same time, large data volume channel will monopolize physical channel. The traditional channel scheduling algorithmof dynamic aircraft primarily faces to specific on - board data source, cannot satisfy the demandof channel preemption and monopoly channel when different on - board data transfer , and the result of virtual channel scheduling is bad. The removable virtual channel scheduling algorithm based on the boundary ofthe urgency of frame is proposed in this paper. Theurgency of channel and data frame are operated respectively. Through the boundaryof the urgency of data frame the proportion of the both is controlled, to shape a new urgency function of channel trans- mission. Forthe on - board data source of different types of aircrafts, reasonable boundary value of the urgency of data frame is chosen, to obtain the good urgency function of channel transmission, analyze the two kinds of resetting status, and complete the judgment scheduling of virtual channel. Experimental result shows that improved algorithm can meet the transmission demand of different sources , and improve the efficiency and accuracyof aircraft＇s virtual channel scheduling.