基于FPGA的双T选频网络的设计与实现  

Design and implementation of double-T filter based on FPGA

作　　者：李哲[1] 高波[1] 马家君[2] 

机构地区：[1]西安邮电大学电子工程学院,陕西西安710061 [2]西安电子科技大学技术物理学院,陕西西安710071

出　　处：《电子技术应用》2013年第10期42-45,共4页Application of Electronic Technique

摘　　要：为提高棱镜式数字激光陀螺稳光程回路中相敏信号解调效率,将较窄的带宽内对信号幅度增益大、波动小的双T选频网络数字化应用到数字激光陀螺解调电路中,使用FPGA进行算法设计,得到带宽为2 Hz的带通滤波器。在数字激光陀螺中与ⅡR滤波器进行对比实验,经过实际系统验证,信噪比提升了200%。Aiming at improving the demodulating efficiency of phase-sensitive signal in the prism-type digital laser gyro stable optical path circuit,the double-T filter digitalization,which is used in narrow bandwidth with larger-increasing amplitude and less-fluctuation signal,is applied in the digital laser gyro demodulating circuit in this paper.The band-pass filter with the bandwidth of 2 Hz is obtained by designing algorithm based on FPGA.The contrast experiment is implemented in the digital laser gyro,and the system verification shows that the double-T filter has a 200％ improvement at the signal-to-noise ratio when comparing with the ⅡR filter.

关 键 词：激光陀螺 双T选频网络 FPGA 滤波器 

分 类 号：TN713.7[电子电信—电路与系统]