一种基于短时傅立叶变换的脉冲星消色散算法

叙述了一种基于短时傅立叶变换的脉冲星消色散算法。首先介绍了脉冲星的色散形成原因以及几种当今流行的消色散算法。接着介绍了短时傅立叶变换,并在此基础上提出了一种基于短时傅立叶变换的消色散算法。然后详细讲述了这种消色散算法的具体实现步骤,并且比较了在选取不同长度的时间窗函数的情况下,消色散的处理过程和残余色散量。最后,通过将这种算法的计算量以及结果和其他几种算法做横向比较,得出了结论:这种消色散算法的计算量小,实现简单,可以有效的进行消色散处理。

A Pulsar de-dispersion Algorithm Based on the Short Time Fourier Transform(STFT)

In this paper,a pulsar de-dispersion algorithm based on the Short Time Fourier Transform(STFT)is presented. First of all the reason of the pulsar dispersion and several popular de-dispersion algrithms are introduced. Secondly the Short Time Fourier Transform(STFT)algorithm is also introduced and a de-dispersion algorihm is proposed based on it. Thirdly, the process of this algorithm is described in detail, and a comparison of the de-dispersion results among different size of window functions is made. Finally, after the comparison among these algorithms, it is shown that this easy-to-implement de-dispersion algorithm needs less amount of computation,and can de-disperse pulsar signals effectively.