基于双谱滤波的脉冲星信号消噪方法  

Denoising pulsar signals by bispectrum filters

作　　者：孙景荣[1] 许录平[1] 王婷[1] 

机构地区：[1]西安电子科技大学电子工程学院,陕西西安710071

出　　处：《华中科技大学学报（自然科学版）》2010年第8期9-12,共4页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家高技术研究发展计划资助项目(2007AA12Z323);国家自然科学基金资助项目(60772139);中国科学院精密导航定位与定时技术重点实验室开放基金资助项目(2009PNTT08)

摘　　要：提出了一种基于双谱相位加幅值滤波的脉冲星信号消噪方法.首先将含噪脉冲星信号变换到双谱域,利用α-删减相位滤波器对其双谱相位进行平滑滤波,并且设计了幅值α-删减加权中值平均滤波器对其双谱幅值进行滤波处理,然后再根据滤波后的双谱值来重构信号的功率谱和相位.仿真结果表明,重构的信号不仅可以消除高斯噪声,而且还对非高斯噪声进行了有效地滤波,比直接双谱重构和仅对双谱相位进行处理重构的效果都要好.A method to denoise pulsar signals is proposed by bispectrum phase and amplitude filtering. The noisy pulsar signal was transformed into bispectral domain; the bispectrum phase was filtered by α-trimmed filter, and the amplitude α-trimmed filter was introduced to process bispectrum amplitude. Then, the pulsar signal can be recovered from the filtered bispectrum. The results indicate that the reconstruction signal can eliminate Gaussian noise and filter non-Gaussian noise effectively. This method result is much better than effects of direct bispectrum reconstruction and only dealing with spectral phase.

关 键 词：脉冲星 信号去噪 信号重构 α-删减滤波器 双谱 滤波 

分 类 号：TN911[电子电信—通信与信息系统]