基于SWT和FRFT的脉冲星TOA估计算法  

Pulsar TOA estimation algorithm based on SWT and FRFT

作　　者：刘劲[1] 马杰[1] 田金文[1] 

机构地区：[1]华中科技大学图像所多谱信息处理技术国家重点实验室,武汉430074

出　　处：《计算机工程与应用》2008年第22期24-26,共3页Computer Engineering and Applications

基　　金：国家高技术研究发展计划(863)No.2006AAJ109;中国航天科技集团五院创新基金(No.CAST200629)~~

摘　　要：提出了一种基于平稳小波和分数阶傅立叶变换的脉冲星超分辨率TOA估计算法。首先,对一个周期内的脉冲星信号进行多层平稳小波分解。然后,估计出与各层低频系数分数阶傅立叶变换相对应的TOA。最后,对脉冲星信号到达时间进行复合估计。实验结果表明,在低采样率,强噪声背景的情况下,该算法能获得稳定、准确的脉冲信号到达时间。The pulsar super-resolution TOA algorithm based on stationary wavelet transform and fractional Fourier transform is proposed.First,the pulsar signal in one period is decomposed by multi-SWT.Then,TOA each corresponding to the low frequency part of the FRFT with different resolution is estimhted.Finally,multiple-estimation of the pulsar TOA is obtained.The simulation results show that this algorithm can achieve precise and steady TOA with low sampling rate in noisy backgrounds.

关 键 词：脉冲星 TOA 平稳小波变换 分数阶傅立叶变换 

分 类 号：TN929.53[电子电信—通信与信息系统]