旋转调制式捷联惯导系统初始对准方案研究

初始对准技术是惯性导航的关键技术之一,其精度将直接影响导航精度。旋转调制式捷联惯导系统在一定的旋转方案下虽然可以将惯性组件的误差调制掉从而提高系统导航精度,但其初始对准的误差则不受调制,所以有必要对旋转调制式惯导系统的初始对准进行深入研究,确定适合旋转式捷联系统使用的对准技术和方案以进一步提高系统精度。文章对可应用于旋转调制式捷联惯导系统的三种对准方案做了研究分析并进行了仿真。结果显示,二位置对准方案可显著提高系统变量的可观测度,连续旋转方案对准精度最高,收敛速度最快,效果最好。

Initial Alignment of Rotation-modulatioin Strapdown Inertial Navigation System

The initial alignment technology is one of the key technology of inertial navigation,and its precision will affect the navigation result.Based on certain scheme,the rotation-modulation strapdown system can modulate the errors of IMUs,therefore the precision of navigation system can be improved.But the errors of initial alignment of the system can not be modulated.So it is essential to study the initial alignment technology of rotation-modulation system and find a proper alignment scheme for such systems.In this paper,three schemes that can be used in rotaion-modulation systems are studied and analysed,at last the schemes are simulated.The results prove that the two-position scheme can improve the observability of system variables and the continous-rotaion scheme provides the best prcision,highest speed and best effects.