高精度分数时延滤波器设计的边界拟合Remez算法  

High-accuracy fractional delay filter design based on Remez algorithm with boundary fitting

作　　者：吴桐 闫毅 王春梅 姚秀娟 陈鼎 WU Tong;YAN Yi;WANG Chunmei;YAO Xiujuan;CHEN Ding(National Space Science Center, Chinese Academy of Sciences, Beijing 100190 , China;University of Chinese Academy of Sciences, Beijing 100010 , China)

机构地区：[1]中国科学院国家空间科学中心,北京100190 [2]中国科学院大学,北京100010

出　　处：《国防科技大学学报》2017年第5期122-127,共6页Journal of National University of Defense Technology

基　　金：国防科工局民用航天专业技术研究资助项目(Y46601C82S)

摘　　要：在卫星星间测距模拟信号仿真及实际测试中,为提高测距模拟信号精度和系统可用带宽,提出基于边界拟合Remez算法的高精度分数时延滤波器的设计算法。该算法利用Farrow结构的多项式近似思想,采用多项式拟合Remez算法设计滤波器的冲激响应边界系数,通过多相分解实现分数时延滤波器组。该算法改善了当设计的滤波器阶数较高时冲激响应边界的不连续现象,进而降低了群时延误差,提高了精度。仿真结果表明,该算法设计的滤波器的分数时延精度得到了提高,同时系统可用带宽提高近一倍,实现时需使用的乘法器数目也有明显降低。In order to improve the ranging accuracy between satellites and increase the available bandwidth of systems in the simulation and tests,a design algorithm for high-accuracy fractional delay filter based on the boundary fitting Remez algorithm was proposed.The proposed algorithm used the polynomial approximation thought of Farrow structure to fit the impulse response boundary coefficients of the filter designed by Remez algorithm,and achieved fractional delay filters through the polyphase decomposition.The proposed algorithm achieved continuous impulse response boundary when high-order filters was used,while the group delay error was reduced and the accuracy was improved.The simulation results show that the proposed algorithm improves the accuracy of fractional delay filters a little,doubles the available bandwidth and reduces the number of multipliers need to be used.

关 键 词：测距信号 分数时延滤波器组 REMEZ算法 群时延误差 边界拟合算法 

分 类 号：TN911[电子电信—通信与信息系统]