中国激光, 2016, 43 (10): 1001003, 网络出版: 2016-10-12
机抖激光陀螺抖频匹配技术的优化
Optimization of Dithering Frequency Matching Technique for Mechanically Dithered Ring Laser Gyros
激光光学 机抖激光陀螺 捷联惯导系统 伪圆锥运动 抖频匹配 频率调谐 laser optics mechanically dithered ring laser gyro strap-down inertial navigation system pseudo coning motion dithering frequency matching frequency tuning
摘要
在机抖激光陀螺(DRLG)捷联惯导系统(SINS)中,陀螺的抖动偏频会引起伪圆锥运动。分析了伪圆锥运动对捷联惯导系统旋转矢量计算的影响,并推导了其表达式。通过数值计算,分析了影响伪圆锥误差的因素,提出了机抖激光陀螺抖动频差的匹配原则,以实现伪圆锥误差最小化。基于该匹配原则,面向工程实际问题提出了一种机抖激光陀螺抖频调谐技术。仿真分析和实验结果表明,选用一种主体抖动轮并按需选配调节构件,该技术可满足系统对陀螺抖动频差的匹配要求,同时不会对陀螺整体外形尺寸和抗振性能造成任何影响。与传统方案相比,进一步提升了机抖激光陀螺,尤其是小型化机抖激光陀螺的工程化水平,降低了生产成本。
Abstract
The dithering of mechanically dithered ring laser gyro (DRLG) leads to pseudo coning motion in the strap-down inertial navigation system (SINS). The influence of the pseudo coning motion on calculation of the rotating vector of SINS is analyzed, and the formula is deduced. To minimize the pseudo coning error, the influcence factors are analyzed by numerical calculation, and the matching principle of dithering frequency difference among different DRLGs in SINS is recommended. Based on the principle, a dithering frequency tunable technology for the practical difficulty during DRLG production is proposed and investigated numerically and experimentally. The results show that the proposed technique can meet the dithering frequecy difference matching demand of SINS by choosing one main dither motor plus appropriate adjusting components, and there is no negative impact on the overall size and the anti-vibration performace of DRLG. Compared to the conventional programs, the proposed technique promotes the productive capacity of DRLG, especially for the miniature DRLG, and reduces the production cost.
马仰华, 韩宗虎, 王继良. 机抖激光陀螺抖频匹配技术的优化[J]. 中国激光, 2016, 43(10): 1001003. Ma Yanghua, Han Zonghu, Wang Jiliang. Optimization of Dithering Frequency Matching Technique for Mechanically Dithered Ring Laser Gyros[J]. Chinese Journal of Lasers, 2016, 43(10): 1001003.