Discussion
Statement I: Enhanced and synthetic vision systems are not interchangeable.
Statement II: One images the real scene with a sensor while the other draws it from a database.
In the light of the above statements, choose the correct answer.
Answer: A
Correct answer: Both Statement I and Statement II are correct
Both statements are correct and the second gives the distinction. An enhanced vision system images the real scene with an infrared, millimetre wave or low-light sensor, so it can reveal a vehicle on the runway or an unlit obstruction. A synthetic vision system draws the scene from a terrain and obstacle database, positioned by the navigation solution, so it gives a clean picture in any weather but shows only what the database holds.
They are therefore complementary rather than interchangeable, and combined vision systems present the two together - the synthetic picture as a background with the sensor image overlaid.
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