改进的单轴旋转SINS初始对准方法

The improved method of the SINS initial alignment based on single-axis rotation

针对单轴旋转捷联惯导系统中,传统静基座对准的极限精度受器件误差制约的问题,在对静基座初始对准进行误差分析的基础上,提出了一种利用单轴转台实现的初始对准误差修正技术。利用单轴旋转捷联惯导系统本身具有的转动控制机构,通过转位操作,根据对准稳态误差在不同位置的投影关系计算出误差大小,并对系统加以补偿,从而提高系统对准精度。通过仿真试验可以看出:与两位置对准方法相比,该初始对准误差修正技术能够提高精度,并减少对准时间,同时,可以使水平失准角和方位失准角的对准误差显著下降。

Focusing on the issue that the limit of accuracy is restricted by the accuracy of the gyro and accelerometer in the initial alignment of the strapdown inertial navigation system （SINS） on a traditional stationary base, an initial alignment error correction technology with single-axial rotation is proposed based on the error analysis of the initial alignment on a stationary base. With the rotation control mechanism of the single-axial rotation SINS and the rotation operation, the alignment error is able to be computed based on the projection relationship in different positions. The alignment accuracy can be improved through compensating the alignment errors. The simulation results show that the performance of the ding the precision initial alignment error correction technology is better than that of the two-position alignment, incluand duration for the alignment. The horizontal and azimuth alianment errors are decreased.