阻尼状态下捷联惯导系统组合导航方法探讨

Integrated navigation system method of strapdown inertial navigation under damping condition

惯性导航系统在干扰量的作用下，会产生周期性的振荡误差及随时间积累的误差。引入阻尼网络可以对系统振荡误差进行阻尼。而利用外界位置或速度信息则可以修正随时间积累的误差。选择合适的阻尼网络，建立阻尼状态下系统的误差方程，是对长航时激光捷联惯导系统在阻尼状态下的组合导航方法进行分析的基础。计算机仿真和工程试验结果表明：与无阻尼时的导航结果相比，该方法能够一定程度上抑制误差的振荡和随时间的积累，提高了系统的精度。

Inertial navigation system can have periodic vibration error which caused by disturbance quantity. The error also accumulates along with time. The damping network can affect system vibration error. Using outside position or speed information may revise the error that accumulates along with time. Selecting suitable damping network and analyzing the system error equation under damping condition are the first steps to research integrated navigation method while the SINS works for long time under damping condition. Computer simulation and project experiment prove the method is effective to reduce error in certain degree.