数字闭环光纤陀螺输出滤波器设计  

Design of output filter of digital closed-loop fiber optic gyroscopes

作　　者：王妍[1] 刘军[1] 张春熹[1] 

机构地区：[1]军械工程学院光学与电子工程系,河北石家庄050003

出　　处：《光电工程》2006年第8期127-131,共5页Opto-Electronic Engineering

摘　　要：在数字闭环光纤陀螺中,数字输出信号由高抽样率的反馈信号抽取得到,为避免抽取过程中发生频域混迭,应加入输出滤波器对信号进行低通滤波。根据多抽样率数字信号理论,采用多级抽取滤波器的设计方法,为陀螺设计输出滤波器。和一级低通滤波器比较说明,所设计的三级抽取滤波器,运算量小、滤波效果好。测试结果表明,加入输出滤波器不改变陀螺静态特性,抑制了振动时引起的高频误差,提高了陀螺精度。The output of digital closed-loop fiber optic gyroscope （FOG） was decimated from a high sample rate feedback signal. To avoid alias in frequency domain during decimation process, a low-pass filter was needed. A multi-stage decimation filter was designed on the theory of multi-rate digital signal processing. Compared with the one stage low-pass filter, the designed three stage decimation filter has much less computation and better filter character. The testing results show that the designed decimation filter did not change the static performance of the fiber optic gyroscope, but it suppressed the high frequency error caused by vibration, and improved the precision of the fiber optic gyroscope.

关 键 词：光纤陀螺 低通滤波器 信号抽取 数字信号处理 

分 类 号：V241.5[航空宇航科学与技术—飞行器设计]