摘要
针对调频连续波雷达信号处理中噪声的影响,给出一种改进的小波阈值函数法。差频信号的小波阈值去噪中,首先确定小波基,选择分解层数,对信号进行分解,之后采用改进的小波阈值函数法,并利用通用阈值完成阈值量化处理,最后重构信号。采用改进的小波阈值函数法对差频信号去噪仿真,验证了相比传统的软阈值、硬阈值以及已有的一些改进阈值函数法,信噪比有一定的提高。
An improved wavelet threshold function method is proposed to deal with the influence of noise in FMCW radar signal processing. F or the wavelet th re sho ld denoising of the difference frequency s ig na l, firstly the wavelet base is dete rmined , the number of decomposed layers is selected, the signal is decomposed, and then the threshold quantization is achieved by using the general th re shold . The improved wavelet th re shold fu nc t io n method is therefore used to denoise the difference frequency signal. It is verified th a t the signal-to- noise ratio is improved compared wi th the traditional soft threshold , hard threshold and some improved threshold funct ion .
出处
《西安邮电大学学报》
2017年第4期21-25,共5页
Journal of Xi’an University of Posts and Telecommunications
基金
陕西省科技攻关计划资助项目(2014K05-20)
