寻北仪中光纤陀螺斜坡漂移估计与比较

寻北仪中光纤陀螺信号中的斜坡漂移是影响寻北精度的因素之一。对信号中的斜坡漂移部分,采用抗差估计拟合其系数再对其进行补偿;对信号中残留的噪声项以及干扰项,在不同情况下比较了直接平均、抗差估计和小波滤波三种方法的处理效果。算例结果表明:对信号中的斜坡漂移进行补偿,可以显著提高寻北精度;当无异常干扰时,采用小波滤波效果较好;当有异常干扰时,采用抗差估计效果较好。

Estimation and comparison for FOG incline drift in north seeker

FOG incline drift in north seeker is one of the factors that influence the precision of north determining. Robust estimation was applied to calculate the coefficient of the incline drift of the signal to reduce its influence. Averaging,robust estimation and wavelet transform were used and compared for the noise and the disturbance of the signal. The calculation cases show that the north determining accuracy is greatly increased by compensating the incline drift of the signal; the robust estimation performs well when the disturbances exist,otherwise wavelet transform performs well.