New PDF release: Measurement-driven simulation of complex engineering systems

By Arnoud Visser; Interactive Collaborative Information Systems Project

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8, three different subsystems can be distinguished: the Communication, Detection & Tracking and Coordination & Registration subsystem. For each subsystem we will extend the formal description. 1 Communication subsystem The microwave antennas on the portals are scheduled to send a welcome message regularly to start a transaction with OBUs on board of the passing vehicles. During the transaction administrative information is exchanged and the fee paid. The transaction consists of several messages, which can be all be used to approximate the location of the OBU based on the characteristics of the microwave signal, which results in a track.

A distinction has to be made on interactions that take place on different surfaces of the vehicle. For instance the detection of the rear of a vehicle is something complete different than the detection of the front. The origin of this difference is not so much the difference in shape (although the shape of the rear can be quite complex due to antennas, carried bicycles, trailers, etc), but due to the timing. When the rear is detected there is already a history of measurements. There is already a running estimate of the dimensions of the vehicle, an estimate that can be wrapped up because the rear is detected.

Sub)System Model High-level modeling is now applied to the System Functional Description, in order to obtain a stochastic or deterministic description of the behavior of the system, which can be implemented in a simulation. The Virtual Sensor concept, discussed previously in this chapter is an essential means to establish this at a level that can be validated. At this level it is decided what aspects of the System Functional Description can be implemented, possibly applying an incremental development of the simulation.

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