光纤陀螺仪死区的原因分析及误差补偿

光纤陀螺的死区严重影响陀螺的性能和惯导系统的导航精度,有必要分析死区产生的原因并采取相应的补偿措施。通过改变前置放大器的放大倍数,发现不同倍数下的死区大小也有所不同,继而证实了导致死区的干扰的存在。此外还从理论上分析了死区的产生原因,结果表明电路中的串扰是产生死区的主要原因,从而提出了采用方波补偿来消除陀螺输出中的死区,并证实了方法的有效性。

FOG deadband reason analysis and error compensation

The deadband of fiber optic gyroscope(FOG) has a severe influence on the performance of FOG and inertial navigation precision. By changing the gain of preamplifier,it was found that the deadband magnitude would vary with gain magnitude,and then proved that the disturbance that causes the deadband exists. Theory analysis was made which show that the cross-talking in circuit is the main cause that generates deadband. So Square-wave compensation was proposed to eliminate the deadband of the gyroscope output. The validity of this method was also proved.