X射线脉冲星光子序列频域加权测相方法

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X射线脉冲星光子序列频域加权测相方法

更新时间：2025-07-09

- X射线脉冲星光子序列频域加权测相方法
- Issue 6, Pages: 152-158(2016)
- 作者机构：
  
  西安电子科技大学空间科学与技术学院
- 作者简介：
- 基金信息：
- DOI：
  CLC： P128.4
- Published：2016
- 稿件说明：
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[J]. 2016, (6): 152-158.
DOI：

[J]. 2016, (6): 152-158. DOI：

摘要

针对X射线脉冲星信号累积轮廓位相测量误差大的问题

提出了一种直接位相测量的频域加权方法。首先

直接对X射线探测器捕获和采样形成的光子序列进行频域变换得到幅度谱

分别提取幅度谱各个成分的相位

再用幅度对相位变量加权平均

得到位相测量结果;进一步采取分段加权的策略

解决序列过长引起的内存溢出问题;最后对所提出方法的计算复杂度进行了理论分析。仿真结果表明:在观测时长和采样间隔相同的条件下

与平均法相比

加权法的测相精度提高了10%以上;与最大似然(ML)和非线性最小均方误差(NLS)法相比

加权法的比相精度提升了1倍以上

计算速度处于ML法和NLS法之间;分段情况下性能会随着分段数增加有所改善。

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references

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