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水平阻尼状态下惯导系统两点校正弱航态算法

, PP. 99-105

Keywords: 弱航态算法,航态约束,两点校正,扩张状态观测器,平台失调角,水平阻尼状态

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Abstract:

为满足高精度导航要求,提高综合校正精度,应用扩张状态观测器设计了水平阻尼状态下惯导系统两点校正弱航态算法。简要分析了传统两点校正原理、航态约束及算法的不足,利用扩张状态观测器实时估计惯导系统平台水平失调角,并引入传统两点校正过程,得出了两点校正的弱航态算法,并对算法进行了仿真与数值检验。验证结果表明当载体不满足航态约束条件时,传统两点校正估计结果大幅降低甚至发散,而弱航态算法具有更强的适用性,降低了载体的航态要求,提高了综合校正精度,试验1中东向、北向以及方位陀螺漂移校正误差分别由33.5%、51.2%、17.9%降至8.0%、1.8%、3.1%,试验2中校正误差分别由83.7%、39.7%、77.5%降至2.3%、0.3%、1.0%。

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