单轴稳定惯导系统的双位置测漂对准新方法  

New Method of Two-Position Alignment for INS with Single Axis Stabilization

作　　者：苏卫东[1] 任思聪[1] 

机构地区：[1]西北工业大学

出　　处：《西北工业大学学报》1996年第2期299-303,共5页Journal of Northwestern Polytechnical University

摘　　要：结合单轴稳定惯导系统的结构特点，提出了一种新的双位置测漂对准方法。该方法是通过给系统俯仰轴加速计加预置信号，并借助调平回路将系统的单轴稳定平台调“平”，来实现双位置测漂对准的。阐述了具体的对准方法及其数学描述，并对对准误差作了分析及仿真。结果表明：该对准方法与原有的双位置对准方法相比，系统的机械结构和对准过程得到了大大简化，并且在忽略惯性器件标定系数误差的条件下，同样有可能把平台漂移补偿到仅限于陀螺随机漂移的程度。INS (Inertiai Navigation System) with single axis stabilization is still quite usefUl in China. We find that the two methods on its two position alignment proposed by the second author in 1988[1] are still inconvenient, because both require special attention be paid to mechanical design in order to make it possible for platform to rotate a sizable angle in space. We now propose a new method to eliminate this inconvenience.Our algorithm can so compensate for gyro constant drift as to reduce gyro drift down to the level of its random drift. We employ third order level loop and a preassigned signal (0.2g ￣0. 4g) acting on pitch axis accelerometer to make the platform rotate around roll axis through an angle that can be computed from the preassigned signal. Then our algorithm uses eq. (14) to compute the three components of drift to be compensated for.If the preassisned signal is less than 0. 2g, alignment accuracy is reduced. If it is larger than 0. 4g, the alignment time is increased. So it should be in the range 0. 29￣0. 4g.

关 键 词：惯性导航系统 对准 陀螺测漂 

分 类 号：V249.322[航空宇航科学与技术—飞行器设计]