摘要
针对冲击体制穿墙雷达系统中回波信号结构复杂、信噪比低、信号检测困难等问题,提出一种小波-双谱联合检测新算法.在对穿墙雷达回波信号建模的基础上,用联合算法将非相干累积后的回波信号经过小波包变换提高信噪比,再用双谱算法进行信号检测.实验结果验证了新算法的有效性,能提供比单独使用其中任一算法更高的检测精度.该算法能反映墙壁后物体的距离-方位信息,为穿墙雷达系统成像提供了可能.
A new wavelet-bispectrum united detection algorithm is proposed to face with problems such as the complex structure and low signal to noise ratio of radar echo, when there exist difficulties in detecting impulses in through-wall radar systems. Wavelet packet transform is used to improve the SNR of the incoherent integral radar echo , and bispectrum algorithm is used for signal detection in this united detecting algorithm, based on the modeling for the through-wall radar echo. Experimental results verify the effectiveness of the new method showing that more detection accuracy can be afforded than the case when any of the two algorithms is used individually. The distance-azimuth information of the objects behind the wall can be truly reflected and the possibility for through-wall radar imaging can be obtained with the new algorithm.
出处
《北京理工大学学报》
EI
CAS
CSCD
北大核心
2005年第8期734-738,共5页
Transactions of Beijing Institute of Technology
基金
国家部委预研项目(42001060211)
关键词
穿墙雷达系统
超宽带
信号检测
小波包
双谱算法
through-wall radar system
ultra wide band （UWB）
signal detecting
wavelet packet
bispectrum algorithm
作者简介
朱亚平（1977-），女，博士生；
沈庭芝（1944-），女，教授，博士生导师，E-mail：shentz@bit．edu．cn
