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Real-Time Concepts for Embedded SystemsConsider another example of a real-time system-the cruise missile guidance system. A cruise missile flies at subsonic speed. It can travel at about 10 meters above water, 30 meters above flat ground, and 100 meters above mountain terrains. A modern cruise missile can hit a target within a 50-meter range. All these capabilities are due to the high-precision, real-time guidance system built into the nose of a cruise missile. In a simplified view, the guidance system is comprised of the radar system (both forward-looking and look-down radars), the navigation system, and the divert-and-altitude-control system. The navigation system contains digital maps covering the missile flight path. The forward-looking radar scans and maps out the approaching terrains. This information is fed to the navigation system in real time. The navigation system must then recalculate flight coordinates to avoid terrain obstacles. The new coordinates are immediately fed to the divert-and-altitude-control system to adjust the flight path ...» |
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