Discussion
Match each term in List I with its meaning in List II.
List I
A. Strapdown
B. Complementary filter
C. Coning
D. Sculling
List II
1. Sensors fixed to the airframe with the transformation in software
2. High-pass gyro combined with low-pass reference
3. Drift from simultaneous oscillation in two rotational axes
4. Spurious velocity from correlated rate and acceleration oscillation
Select the correct match.
Answer: A
Correct answer: A-1, B-2, C-3, D-4
Each term takes its standard meaning. Strapdown (A) means sensors fixed to the airframe with the transformation performed in software (1). A complementary filter (B) combines a high-passed gyro signal with a low-passed reference (2).
Coning (C) is the attitude drift caused by simultaneous oscillation in two rotational axes (3), and sculling (D) is its translational counterpart - spurious velocity arising when angular rate and acceleration oscillate in correlation (4). Coning corrupts attitude, sculling corrupts velocity, and both need compensation terms computed at high rate.
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