Discussion
Match each technique in List I with what it establishes in List II.
List I
A. Levelling on the accelerometers
B. Gyro compassing
C. Reading the magnetometer
D. Median voting
List II
1. Initial pitch and roll
2. True heading from the earth's rotation rate
3. Magnetic heading
4. Exclusion of a failed unit among three
Select the correct match.
Answer: D
Correct answer: A-1, B-2, C-3, D-4
Each technique is matched to what it establishes. Levelling on the accelerometers (A) gives initial pitch and roll (1) from the sensed gravity vector. Gyro compassing (B) gives true heading from the horizontal component of the earth's rotation rate (2).
Reading the magnetometer (C) gives magnetic heading (3), to which variation must be applied for true heading. Median voting (D) is not an alignment technique at all but a redundancy one, excluding a failed unit among three (4) - the odd item out in an otherwise alignment-focused list.
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