Discussion
Statement I: Strapdown systems became practical only once fast processors were available.
Statement II: Removing the gimbals moves the coordinate transformation into software.
In the light of the above statements, choose the correct answer.
Answer: C
Correct answer: Both Statement I and Statement II are correct
Both statements are correct and the second explains the first. Removing the gimbals leaves the sensors fixed to the airframe, so they measure in body axes; the transformation from body axes to the navigation frame, which the gimbals used to perform mechanically, must then be computed in software at high rate.
That computation - integrating the attitude quaternion or direction cosine matrix hundreds of times a second, with coning and sculling compensation - was beyond affordable processors until the 1970s and 1980s, which is why strapdown systems entered service long after the sensors themselves existed.
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