单轴旋转式捷联惯导方位对准研究

Analysis of single-axial rotation SINS azimuth alignment

为消除东向陀螺常值漂移对捷联惯导方位对准精度的影响,在罗经法对准频率特性分析的基础上提出了一种适于旋转调制捷联惯导系统的罗经对准方法。该方法利用旋转过程中陀螺漂移和加速度计零偏被调制为周期变量的特点,针对旋转频率来改变罗经法对准系统的参数,使系统能够对调制后的陀螺漂移和加速度计零偏产生抑制作用,以此消除静基座对准中由东向陀螺常值漂移所引起的方位误差角。仿真实验结果表明,相比静基座对准,在单轴旋转中采用此种罗经法对准可以消除方位角的常值误差,方位对准的精度可提高至10倍以上。

In order to eliminate the negative effect of east gyroscope drift on SINS azimuth alignment,a gyrocompass azimuth alignment technique applicable to single-axial rotation SINS is described.As gyroscope drift and accelerometer bias is modulated into periodic error in rotating process,the influence of gyroscope drift and accelerometer bias on azimuth alignment can be reduced by changing the parameters of gyrocompass alignment system,and the effect of east gyroscope drift on SINS azimuth alignment can be eliminated.Simulation results show that,compared with the stationary base alignment method,the proposed method can eliminate the constant azimuth misalignment angle in rotating process,and the accuracy of SINS azimuth alignment is improved by 10 times.