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Thesis - Leigh Moody.pdf - Bad Request - Cranfield University

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Chapter 8 / Simulation<br />

_ _<br />

field is re-selecting, the cursor is placed at the end of the text, and the delete<br />

key is used. There are 12 graph control buttons labelled GRA1 to GRA12<br />

selected using the left-hand mouse button. These buttons invoke separate<br />

pop-up windows for each variable containing a revolving time base graph,<br />

automatically scaled and presented in display units; an example of which is<br />

shown in Figure 8-12.<br />

Figure 8-12 : Rolling Graphics Window<br />

A new point is drawn on the graph at the windows refresh rate. Each graph<br />

is scaled to display the maximum value of the input signal. If the current<br />

limit is exceeded the graph is re-scaled and a “↓“ symbol is displayed above<br />

the upper limit guide and the scale values increased by a factor of 2. When<br />

a GRA button is de-activated the graph automatically disappears and all<br />

limits are reset if re-activated.<br />

8.7.3 Target Wire Frame Window<br />

Critical points associated with target designation and tracking are dipicted<br />

on a wire frame representation of the following targets:<br />

• Backfire ( I_BACKFIRE )<br />

• F15 ( I_F15 )<br />

• Flogger ( I_FLOGGER )<br />

8-24<br />

• F106 ( I_F106 )<br />

• Flanker ( I_FLANKER )<br />

• Fulcrum ( I_FULCRUM )<br />

The simulation modules shown in brackets above are used to initialise the<br />

selected wire frame target model. Embedding the initialisation modules in<br />

the target visualisation software allows the user to change the target type<br />

interactively. The facet co-ordinates are defined in data files with the<br />

extension “*.GEO”, taking the name listed above. The facets are drawn in<br />

order, starting with those whose range is greatest along the LOS. This<br />

hidden facet layering technique removes lines that would naturally be<br />

hidden from view, as shown in Figure 8-13. The range to the target from<br />

the origin of the viewing axis chosen is displayed at the bottom of the<br />

window together with the image processing state (unused).<br />

8.7.3.1 Control Menu<br />

The CONTROL menu provides the usual RUN, STEP and STOP controls<br />

and a ZOOM facility. This toggles between a target viewed in perspective

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