任意采样率变换数字重构滤波器设计  

Design of Digital Reconstruction Filters with Variable Sample Rate

作　　者：万伟程 李艳华 周三文 

机构地区：[1]北京遥测技术研究所,北京100076

出　　处：《飞行器测控学报》2014年第4期360-365,共6页Journal of Spacecraft TT&C Technology

摘　　要：针对理想重构函数在数字信号域不可实现而直接截取性能较差的情况,根据信号重构理论和FIR(Finite Impulse Response,有限脉冲响应)滤波器窗函数设计法,分析不同窗函数、不同截取长度对重构滤波器的影响,提出一种凯塞窗任意采样率变换数字重构滤波器设计方法。该方法通过选择合适的窗参数、截取长度、重构滤波器时域精度和量化位数,有效控制阻带最小衰减抑制数字重构镜像。设计的数字重构滤波器已成功应用于某卫星基带调制解调器,符合镜像抑制大于65dB的性能要求。Following analysis of the influence of different window functions and different truncation length on recon- struction filters in accordance with signal reconstruction theorem and window function design method of FIR （Finite Impulse Response） filter, a design method of digital reconstruction filters with variable arbitrary sample rate is pro- posed using Kaiser window as ideal reconstruction is impossible in digital signal processing while its direct truncation doesn＇t perform well. Through selection of appropriate window parameters, truncation length, time accuracy of re- construction filter and quantization bits, the method effectively controls the minimum stopband attention to suppress the reconstruction image. The designed reconstruction filter is successfully used in a satellite baseband modem and its image suppression is greater than 65 dB, meeting desired performance requirements.

关 键 词：多速率信号处理 理想重构 数字滤波器 窗函数 

分 类 号：V556[航空宇航科学与技术—人机与环境工程] TN911.72[电子电信—通信与信息系统]