基于正交镜像滤波器组的子带脉冲压缩方法  

The subband pulse compression method based on quadratture mirror filter (QMF) banks

作　　者：高翠翠[1] 林明[1] 钱春雷[1] 

机构地区：[1]江苏科技大学电子信息学院,江苏镇江212003

出　　处：《微型机与应用》2015年第19期27-29,42,共4页Microcomputer & Its Applications

摘　　要：针对超宽带雷达频带分割滤波器不理想、导致子带脉冲压缩和直接脉冲压缩结果相差较大的问题,本文提出了基于正交镜像滤波器组的子带脉冲压缩方法。首先设计了近似完全重建的正交镜像滤波器组,定义目标函数为通带误差、阻带能量和失真转移函数平方误差的加权和,通过无约束的变尺度方法将其最小化,然后用设计的正交镜像滤波器作为频带分割滤波器,实现子带脉冲压缩。仿真结果表明,本文设计的正交镜像滤波器组,相比现有的设计,具有更小的峰值重建误差、通带和阻带误差。提出的子带脉冲压缩方法,与传统方法相比,主副瓣比和主瓣宽度等脉压性能也明显提高。For the problem that ultra-wideband（UWB）radar channel dropping filter isn′t ideal, which causes big error between subband pulse compression and direct pulse compression, a new method of subband pulse compression of UWB radar is presented.In the new method, nearly perfect-reconstruction two-channel quadrature mirror filter banks is designed at first. The objective function is formulated as a weighted sum of pass-band error and stop-band residual energy of low-pass prototype filter, and the square error of the distortion transfer function, which is minimized by unconstrained indirect update optimization method. The QMF replaces channel dropping filter. Compared with traditional subband pulse pressure method, simulation results show that the mainlobe to sidelobe and mainlobe width in proposed method are improved obviously.

关 键 词：超宽带雷达 脉冲压缩 正交镜像滤波器组 FIR原型滤波器 

分 类 号：TP335.1[自动化与计算机技术—计算机系统结构]