Browse Publications Technical Papers 2018-01-1949

ED-247 (VISTAS) Gateway for Hybrid Test Systems 2018-01-1949

Testing a full Aircraft System involving several on-board computers, physical I/O and communication buses require connecting them to adequate test benches to stimulate or monitor the I/O in a suitable way. These benches are under control of models that reproduce the flight situations that occur in a real Aircraft. In many situations, it makes sense to replace one or several real computers by a virtualized equivalent device. Basically, a software representation of the equipment running on a PC helps achieving V&V tasks, even when the real systems are not yet all available. Such a setup, combining real and virtualized systems is called "Hybrid Test System". But then, how can we handle I/O and buses on a virtual equipment? One answer to this is the ED-247 EUROCAE standard, also called "VISTAS", which recently has been brought to a mature state. The main idea behind is to encapsulate I/O or busses information in UDP multicast datagrams on an Ethernet network. Once this is done, several virtualized computers can be connected together and distributed simulations can be run, as if these were real ones. One difficulty arises in hybrid testing configurations when real devices and virtualized ones have to be connected together. In general, a real computer is connected to a simulator that provides the counterpart of buses and I /O. Multiple simulators can be combined, with the help of a communication layer, such as the one defined in the research project 'VHTNG' (Virtual and Hybrid Testing Next Generation). But the communication layer purpose is different from the VISTAS standard and combining both requires a suitable Gateway. In the scope of the VHTNG project, dSPACE France focuses on the Gateway functionality between the Communication Layer and virtualized computers having a VISTAS interface. The Gateway translates a description of real I/O or buses to the equivalent VISTAS form and vice-versa. In this paper, we'll discuss the requirements for the Gateway, and then present the mechanisms used, and how a few specific problems have been solved. The discussion is based on the work dSPACE France has done for building a fully operational demonstrator for the VHTNG project.


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