第19卷
第1期
2011年1月文章编号
1004-924X(2011)01-0146-07
光学精密工程
Optics and Precision Engineering
Vol.19No.1
Jan.2011
速率偏频激光陀螺寻北仪标度因数的在线估计
张岩，吴文启，吴美平
（国防科技大学机电工程与自动化学院，湖南长沙410073）
度因数发生缓慢变化的问题，提出了在线估计标定因数的方法，并研究了速率偏频激光陀螺寻北仪及其标度因数测量误差。首先，通过标度因数实验研究其变化规律；然后，仿真分析了激光陀螺标度因数测量误差对寻北精度的影响；最后，根据陀螺测量值周期重复变化规律，提出了一种在线一阶递推估计标度因数变化的算法，通过引人单轴转台的角度测量值，得到了标度因数的变化参数。仿真分析表明，该算法对速率偏频激光陀螺标度因数变化的估计误差优于1×10-°，由标度因数变化引起的导北标准差减小至2"左右。寻北实验结果表明，该算法能够有效抑制标度因数变化引起的导北误差，5min寻北标准差达到24"，基本满足高精度寻北的需求。
关键词：速率偏频激光陷螺；寻北仅；标度因数递推算法：在线估计
中图分类号：V241.5;U666.1
文鼓标识码：A
doi:10.3788/(OPE.20111901.0146
Onlineestimationforscalefactorofnorth-finder
based onratebiased ringlasergyroscope
ZHANG Yan,WU Wen-qi,WuMei-ping
(College of Mechatronics Engineering and Automation,
National Universityof Defense Technology,Changsha 410073,China)
Abstract: To satisfy the engineering requirement of high precision north-finding, the north-finder based on a Rate Biased Ring Laser Gyroscope (RBRLG) and its measurement error come from the scale factor of RBRLG were studied to solve the problem on the scale factor slow change resulted from the inner temperature change and the instability of lock-in region of the RBRLG. Firstly, the change rule of scale factor was researched by a scale factor test. Then, the influence of the scale factor change on the north-finding precision was analyzed by a simulation, Finally, an online first order recursive al gorithm was established to estimate the scale factor change according to the periodicity of RBRLG measurement, By introducing the platform angle measurement, the scale factor changes could be ob-tained, Simulated results indicate that the estimation error for the scale factor of RBRLG is less than 1 X 1o- by the proposed algorithm, and the standard deviations of north-finding results caused by the scale factor change decrease to about 2". The experiment on the north-finder results shows that this al-gorithm can effectively restrain the north-finding error caused by scale factor change,and the standard
收稿日期：2010-08-16；修订日期：2010-10-27.
基金项目：国家自然科学基金资助项目（No.60604011)；航空科学基金资助项目（No.20070888002)