High-latitude ground alignment error budgets require explicitly modeling second-order sculling and vibro-pendulous base motion rectifications to prevent false bias growth.
Analytical error bounds combine accelerometer bias tilt projection and latitude secant gyrocompassing equations to establish deterministic spatial uncertainty limits.
Stationary alignment extracts gravity and Earth rate vectors to initialize pitch, roll, and true north azimuth prior to unguided motion tracking.
Ground alignment error bounds depend on accelerometer turn-on bias for leveling and East gyro bias stability divided by cosine latitude for heading accuracy.
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