针对典型的双轴转停旋转调制系统,从捷联惯导姿态角误差方程出发,理论分析了载体角运动对旋转调制效果的影响。刻度系数误差导致的直流分量误差可等效为不可调制的常值陀螺漂移,对系统的精度水平有较大影响。安装误差导致的交流分量误差可等效为周期振荡的陀螺仪漂移,对系统精度影响较小。仿真结果有效验证了相关分析结论。
Based on attitude error equations of typical dual-axis-index Inertial Navigation System(INS), influence of angular motion of vehicle is theoretically analyzed. The angular motion, coupled with scale factor and installation error, can deteriorate precision of INS, and produce a new type of error. Scale factor error leads to DC component, which is equivalent to un-compensable constant drift of gyroscope, and has great effect on INS. Installation error leads to AC component, which is equivalent to periodic oscillating drift of gyroscope, and has limited influence on INS. Results of experiment verifies the mentioned conclusions.