Developement Of An Instrument Landing Simulation ... - Cal Poly

3.2.1.5 Instrument ModelThe instrument model in Figure 24receives the inputs from the SixDOF model. Thismodel initializes the instruments and sets therange of the instruments. The model then sendsthe values to the D/A cards, which convert it to arange of +/- 5 volts. This communication is donethrough the use of the DA Channel class. This isan excellent model for testing and calibrating theinstruments and channels.Figure 24: Instrument Model3.2.1.6 Graphics ModelThe graphics model receives the position androtation from the SixDOF model as well. It sends theinformation over the Ethernet to the three graphicscomputers using UDP. The model waits for the graphicsto initialize before it starts the simulation. It also does aconversion from aircraft axis to world axis. Figure 25shows the graphics model with the three outgoingsignals to each computer that send the aircraft’s positionFigure 25: Graphics Modeland orientation as well as whether to keep the graphics running. On the client side,26