摘要
高精度寻北是旋转调制光纤陀螺惯导实现高精度导航的前提,也是其技术优势的体现。针对当前旋转调制光纤陀螺惯导在快速高精度寻北中遇到的问题,对其寻北精度极限进行了深入研究,梳理出4项最主要的影响因素,对其影响机理、误差模型、量级进行了深入的分析,并通过样机试验进行了验证。结果表明,尽管随机游走系数是制约寻北精度极限的最终因素,但陀螺刻度系数误差、扰动速度、航向效应等误差处理不好,将严重影响旋转调制寻北精度;通过采取措施,高精度光纤陀螺旋转调制惯导5min寻北精度已达到35″(3σ),进一步提高精度的措施正在研究中。
The premise of rotation-modulating FOG-SINS achieving high accuracy navigation is high precision northseeking, which is the embodiment of technical advantage. Aiming at the problem of quick and high accuracy north-seeking with rotation-modulating FOG-SINS, we study deeply on the precision limit of north-seeking. Four main influence factors are carded. We analyze deeply the influencing mechanism, error model and magnitude. A validation is made with test prototype. The result shows that though random walk is the final factor to restrict north-seeking precision limit, it will confine the precision a lot if gyroscopes scale factor error, perturbation velocity and heading effect cannot be dealed well. Through taking measures, the north-seeking precision of high accuracy rotation-modulating FOG-SINS can reach 35＂ within 5min.
出处
《导航定位与授时》
2015年第3期11-15,共5页
Navigation Positioning and Timing
关键词
寻北精度极限
旋转调制
光纤陀螺
随机游走
航向效应
North-seeking precision limit
Rotation-modulation
FOG
Random walk
Heading effect
