速率偏频技术提高激光陀螺精度的理论研究

Theoretical Research on Improving the Accuracy of Laser Gyro Using Rate Biased Technique

以分析激光陀螺主要误差源出发点 ,从理论上研究了速率偏频技术的作用 ,指出它可有效地降低激光陀螺锁区引入的随机游走误差 ,部分地补偿激光陀螺谐振腔中的光束位移引起的不可控激光陀螺的零偏误差 ,并可解决抖动激光陀螺在系统使用中的锥形误差 (ConingError)和划桨误差 (Sculling Error)。利用激光陀螺的拍频方程和拌动偏频激光陀螺的拍频近似解 ,得出了速率偏频激光陀螺随机游走误差与速率偏频系统参数的表达式 ,并指出了速率偏频技术的特点及速率偏频技术要解决的主要技术问题。

Based on the analysis of major errors of laser gyro,it is theoretically investigated and showed that the rate biased technique can virtually decrease all the random walk error,partially compensate the null drift error caused by laser beam movement in the discharge tubes of ring laser resonator cavity,and solve the coning error and sculling error caused by mechanically dither involved in singleaxis dither laser gyros.Using laser gyro beat frequency equation and dither beat frequency solutions,the formulae of random walk error and rate biased system parameters are given.The performance and important technical problems involved in rate biased system are presented.