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A strapdown system differs from a gimballed one in that its sensors are

  • A.Located outside the fuselage
  • B.Fixed to the airframe
  • C.Mounted on a stabilised platform
  • D.Free to rotate in three axes

Answer: B

Removing the gimbals removes the bearings, the motors and their wear, and puts the burden on computation instead. It is why strapdown became practical only once processors were fast enough to update the attitude matrix at high rate.

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