基于 FPGA 的浮点 FIR 滤波器设计

摘要

针对定点FIR滤波器的精度和稳定性不高，且高阶FIR滤波器资源开销大的弊端，在FPGA上提出和设计了一种基于浮点运算的FIR滤波器。采用该浮点FIR滤波器，不仅能有效的降低因定点FIR滤波器权系数量化所引入的误差，同时还不会增加额外的硬件开销。在解调国内某型激光陀螺信号时，该滤波器取得了不俗的表现，同时该滤波器具有可移植性强，应用灵活等特点。%In view of the low accuracy , low stability and highly cost of hardware resource of FIR filter using fix-point, a design scheme to realize a FIR filter using floating-point based on FPGA was introduced .It is successful to improve the accuracy of FIR filter and efficient to reduce the error of integer FIR filter′s ratio by using the floating-point arith-metic units, meanwhile, the additional hardware cost won′t be increased.This filter has not only successfully apply to de-modulate the laser gyroscope signal , but also has powerful portability and great flexible application .