旋转方案对捷联惯导系统误差特性的影响

分析了单轴和双轴连续旋转方案对于捷联惯导系统误差特性的影响。结果表明,单轴连续旋转不仅不能调制旋转轴向上陀螺的常值漂移,反而引入大小为刻度系数误差与旋转转速乘积的等效陀螺漂移,此漂移严重制约高精度陀螺组成的捷联惯导的定位精度。双轴连续旋转可以调制旋转轴向陀螺的常值漂移以及由刻度系数误差和旋转转速耦合引入的等效陀螺漂移。但因惯性器件的刻度系数误差与载体运动耦合,会在3个轴向引起等效陀螺漂移,此漂移对系统的定位精度影响强烈。不同的仿真实验证明了理论分析。

Influence of Rotation Schemes on Error of SINS

Influence of single-axial rotation and double-axial rotation scheme on error characteristics of Strap-down Inertial Navigation System(SINS) was analyzed theoretically.The analysis indicated that,in single-axial and single-directed rotation scheme,the gyro's bias on rotational axis was not modulated,instead,an equivalent bias with size of scale-factor error multiplying rotating velocity was introduced in rotational axis,which had serious effect on the positioning precision of the SINS.In double-axial and single-directed rotation scheme,both gyro's bias and aforementioned equivalent bias were modulated,while another equivalent bias caused by coupling of the scale-factor error and the movement of ship were introduced,and this bias also had serious effect on the positioning precision.The theoretical analysis was proved by simulation.