VHF空地数据链信道访问参数研究

基于甚高频空地数据链信道访问模型和CSMA的矩阵分析方法,详细研究了数据报告更新率、数据报文长度、监听密度、数据链路信息传输率、数据链地面站的覆盖范围、数据链所能支持的飞机数目等参数,在不同的信道访问特性变化规律下对系统的吞吐量及报文传输延时的影响.仿真分析的结果表明:信道访问参数对VHF空地数据链的性能有显著的影响.

Study of the Channel Access Parameters for VHF Air-to-Ground Datalink

The system throughput and the message transmission delay influenced by the channel access parameters under various channel access rules is studied in this paper. The analysis is based on the model of channel access state transition for VHF air to ground data link and CSMA matrix analysis method. The channel access parameters include the updating rate of report, the message length, the detecting density, the date rate of data link, the coverage of remote ground stations, the number of aircrafts operated by remote ground station. The simulation results show that these parameters have significant effects on the performance of VHF air to ground data link. At the same time, valuable conclusion is obtained from the simulation results.