摘要
针对因频带分割滤波器的不理想产生的频谱混叠、幅度以及相位失真导致子带脉压误差较大的问题,提出了一种采用小波设计的正交镜像滤波器组进行频带分割的子带脉压方法。借助小波及多分辨分析理论,利用最优频域准则设计频带分割滤波器组,消除或减小混叠失真、幅度及相位失真后,对信号进行频域分解,实现子带脉冲压缩。仿真结果表明,和传统的子带脉压方法相比,所提的脉压方法在主副瓣比方面提高了约12 d B,最大脉压误差减小了约7 d B,验证了该算法的正确性和有效性。
The non- ideal channel dropping filter may cause many problems,such as aliasing,amplitude,and phase distortion,which lead to great pulse compression errors. In order to solve above problems,a new sub- band pulse compression method based on quadrature mirror filter( QMF) by using wavelet is presented. The channel dropping filter is designed by means of wavelet and multi- resolution and the optimal frequency domain criteria. In this way,aliasing,amplitude and phase distortion are eliminated or minimized.The sub- band pulse compression can be realized by splitting band. The simulation results show that the main- lobe to side- lobe of the proposed method improves 12 d B,and the maximal pulse compression error decreases by 7 d B nearly,compared with the traditional sub- band pulse compression method. The simulation results prove the correctness and effectiveness of the method.
出处
《电讯技术》
北大核心
2016年第1期98-103,共6页
Telecommunication Engineering
基金
国家自然科学基金资助项目(61401179)~~
关键词
超宽带雷达信号
脉冲压缩
小波及多分辨分析
频带分割滤波器
正交镜像滤波器
ultra-wideband radar signal
pulse compression
wavelet and multi-resolution
channel dropping filter
quadrature mirror filter
