Abstract:

The initial velocity due to the linear vibration will affect the precision of the inertial coarse alignment considerably. According to the error analysis, the 0.1 m/s initial north velocity will lead to the head error by 3.15° for the inertial coarse alignment within 2 minutes in latitude 45°. To address the issue, the linear vibration including the initial velocity can be well suppressed throuth the polynomial least square approximation. The proposed improved inertial coarse alignment algorithm is compared with the other related inertial coarse alignment algorithms through vehicular experiments. And the results show that the proposed improved algorithm is of good stability and the head error is less than 0.05°, which achieves the best alignment results.