基于温度变化Fourier展开的惯导航向效应补偿

航向效应对高精度空间稳定平台式惯性导航系统具有致命的影响。根据系统变航向导航试验数据,分析了变航向引起温度及平台漂移变化的作用机理,讨论了平台漂移变化与温度变化的相关性,进而提出基于温度变化Fourier展开的航向效应补偿方法。采用滑动最小二乘拟合导航误差的方法提取平台常值漂移的变化,并以此为观测量标定平台漂移的温度系数。最后,利用多组变航向试验数据对所述补偿方法进行验证,结果表明:平台常值漂移变化与温度变化基波分量的幅值具有强相关性,该补偿方法可将温度变化引起的航向效应误差降低40%~90%,具有较强的工程应用潜力。

Compensation method of heading effect for inertial navigation system based on Fourier decomposition of temperature variation

Heading effect is one of the most challenging problems of high accuracy space-stable platform inertial navigation systems.With system heading changing experiment data,the affection theory of heading changing to variations of temperature and platform drift is analyzed,and the relationship between platform drift variation and temperature variation is discussed.In sequence,a compensation method of heading effect based on Fourier decomposition of temperature variation is proposed.Moving least-squares fitting of navigation errors is adopted to withdraw the actual series of platform constant drift,which are thereafter the observations for calibrating temperature coefficients of platform drift.Multiple heading changing experiments are conducted to verify the proposed method.The results show that there exists strong correlation between platform constant drift variation and the amplitudes of fundamental wave of temperature variation,and the heading effect errors due to temperature variation may be reduced by 40％ to 90％ with the proposed compensation method,which has significant potential for engineering application.