基于不变误差的双轴旋转惯性导航系统的快速自我校准方法
Xin Sun1, Jizhou Lai1, Pin Lyu1
1Navigation Research Center, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.
Sensors (Basel, Switzerland)
|January 23, 2024
概括
本研究介绍了双轴旋转惯性导航系统 (RINS) 的新自我校准方法. 自动化方法在不拆卸的情况下校准惯性测量单元 (IMU),提高精度并减少校准时间.
科学领域:
- 导航系统工程 导航系统工程
- 机械电子和控制系统
- 地质学和地质调查
背景情况:
- 双轴旋转惯性导航系统 (RINS) 需要定期校准以保持准确性.
- 传统的惯性测量单元 (IMU) 校准是劳动密集型,耗时,并有可能引入新的安装错误.
- 现有的方法需要拆卸设备,这阻碍了作战准备.
研究的目的:
- 为RINS开发一个系统级的,自动化的自我校准方法,消除了拆卸的需要.
- 通过使用不变错误建模来实现高精度校准.
- 显著减少校准时间,提高RINS的整体准确性.
主要方法:
- 将惯性框架中的导航参数错误表达为不变错误,用于快速准确的初始态度估计.
- 使用吉姆巴机制输出并使用回溯导航重新使用传感器数据来建立角速度约束方程.
- 设计一个特定的IMU旋转方案,以确保完全的错误可观测性,通过零碎常量系统方法和奇数值分解 (SVD) 进行分析.
主要成果:
- 拟议的方法有效地在12分钟内估计IMU错误和旋转轴安装错误.
- 对错误的估计准确度低于4%.
- 校准后补偿显著提高了RINS的速度和位置精度.
结论:
- 开发的自校准技术为RINS维护提供了高效和准确的解决方案.
- 无需拆卸的自动化,现场校准是可行的,对RINS性能有利.
- 这种方法解决了传统校准的局限性,提高了运营效率和导航精度.
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