摘要
在对激光引信回波进行信噪比分析的基础上,针对低信噪比时峰值检测法在回波幅值提取中相对误差较大的问题,提出了一种采用小波阈值去噪提高幅值提取精度的方法。基于Mallat算法对回波信号进行快速分解与重构,并实际计算了峰值检测法在低信噪比回波幅值提取中的相对误差。研究结果表明,小波阈值去噪能较好地分离回波信号中的高频噪声,减小低信噪比回波幅值提取的相对误差,从而提高了回波幅值提取的精度。
In view of the fact that the laser fuze is easy to be interfered by fog and smoke,a method of anti-interference based on dual-wavelength detection is proposed in this paper. The scattering characteristic of single aerosol particle to dual-wavelength laser is researched. The scattering echo both by analysis and measurement are given.Reflectivity of some metal and nonmetal targets to dual-wavelength laser is practically measured. The analytic and experimental results show that the scattering characteristic of fog and smoke particles to dual-wavelength laser are different,while the ratio of backscattering power is usually more than 2. The reflectivity of targets to dual-wavelength laser is nearly the same,while the ratio of reflected power is about 1. Using information of backscattering power ratio in signal processing is a new approach to anti-interference for laser fuze.
出处
《电子科技》
2015年第7期74-77,86,共5页
Electronic Science and Technology
关键词
引信回波
信噪比
阈值去噪
幅值提取
laser fuze
dual-wavelength detection
aerosol scattering
target reflection
