Study of the channel access parameters for VHF air-to-ground data-link

The system throughput and the message transmission delay influenced by the channel access parameters under various channel access rules were studied. 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 station and the number of aircraft operated by remote ground station. The simulation results show that these parameters have significant effects on the performance of the data-link.