摘要
提出了一种基于 DSP 芯片实现的双频率数字调制谐振式光纤陀螺系统的闭环检测方案。在此方案中,利用带通滤波器从探测器的输出光强信号中提取其基波频率的正弦信号,通过相关检测原理去掉干扰的噪声,并利用低通滤波器提取与探测器输出光强幅度直接成正比的直流信号,将其转换成相应的谐振频差,利用此频差即可求得陀螺的旋转角速度。此方案检测线路简单,操作方便,基于 DSP 芯片的实现则大大提高了系统处理速度。同时,还利用 Matlab 软件对检测系统中的滤波器参数进行了优化设计,提高了系统的检测精度。
A closed-loop digital detection system in resonant fiber gyro by two frequencies modulation based on DSP chip is proposed. In this system, the sinusoidal signal of its fundamental frequency is extracted from the output light intensity signal of the detector by use of band-pass filter. The noise is eliminated by using correlative detection principle. The DC component, proportional to the light intensity of detector output, is extracted by low-pass filter and converted into corresponding resonant frequency difference, and then the angle rotating speed of the gyroscope can be calculated based on such frequency difference. The detection circuit of this system is simple and the operation is convenient. The processing speed of this system has been greatly improved due to application of. DSP chip. Moreover, the optimization design for the filter parameters of the detection system is realized by Matlab software, thus improving the detection accuracy of the system.
出处
《光电工程》
EI
CAS
CSCD
北大核心
2005年第2期45-48,共4页
Opto-Electronic Engineering
基金
国家重点基础研究发展规划项目课题(G1999033110)
关键词
光纤陀螺
数字检测
优化设计
双频率调制
Fiber optic gyroscopes
Digital detection
Optimized design
Two frequencies modulation
