SES: ARINC - VHF Datalink Mode-4 Simulation

Working with Helios Technology for ARINC, SES developed a full SARP compliant VHF Data Link Mode 4 Simulation model using the OPNET modelling tool, from Mil3. The tool allows ARINC to investigate the VDL Mode 4 standard using large (up to 500 aircraft) realistic scenarios.

The tools uses include investigation of network loading, network planning, datalink capacity estimation and has already been successfully used to investigate net entry and transmission delays in the presence of high datalink traffic. Results derived from the tool are being fed back into the worldwide SARP validation process.

The model is implemented in the OPNET communications modelling and planning tool which provides the infrastructure in which the tool operates.

Various modelling optimisations were undertaken during the development to ensure that the model was able to operate efficiently in a broadcast environment in which up to 500 modelled aircraft could simultaneously receive all broadcasts made by a given platform, every 10 milliseconds.

The tool was well received by ARINC and is regularly used to support investigation of Mode-4 issues.