一种基于泊松分布的提高X射线脉冲星脉冲轮廓信噪比的方法
发布时间:2018-08-24 17:48
【摘要】:论述了X射线脉冲星辐射模型和脉冲轮廓构造算法,提出了以Kullback-leibler距离函数作为评价标准,提高具有泊松分布规律的X射线脉冲星脉冲轮廓信噪比的平滑算法,推导了平滑参数和平滑累积脉冲轮廓的计算公式.搭建了X射线脉冲星导航地面模拟系统,实现了对模拟X射线脉冲星单光子到达时间的记录及X射线脉冲星脉冲轮廓的构造,得到了X射线脉冲到达时间TOA.在X射线脉冲星导航地面模拟系统上,对平滑算法进行了验证,结果表明该算法对于提高累积脉冲轮廓的信噪比效果显著,信噪比提高大于10dB.
[Abstract]:The radiation model of X-ray pulsar and the algorithm of constructing pulse profile are discussed. A smoothing algorithm for improving the signal-to-noise ratio (SNR) of pulse profile of X-ray pulsars with Poisson distribution is proposed, which is based on the Kullback-leibler distance function. The calculation formulas of smoothing parameters and smoothing cumulative pulse profile are derived. A ground simulation system for X-ray pulsar navigation is built. The recording of the time of single photon arrival of the simulated X-ray pulsar and the construction of the pulse profile of the X-ray pulsar are realized. The X-ray pulse arrival time (TOA.) is obtained. The smoothing algorithm is verified in the X-ray pulsar navigation ground simulation system. The results show that the proposed algorithm can improve the signal-to-noise ratio (SNR) of the cumulative pulse profile with a signal-to-noise ratio (SNR) greater than 10 dB.
【作者单位】: 中国科学院西安光学精密机械研究所瞬态光学与光子技术国家重点实验室;中国科学院研究生院;
【分类号】:P145.6
本文编号:2201572
[Abstract]:The radiation model of X-ray pulsar and the algorithm of constructing pulse profile are discussed. A smoothing algorithm for improving the signal-to-noise ratio (SNR) of pulse profile of X-ray pulsars with Poisson distribution is proposed, which is based on the Kullback-leibler distance function. The calculation formulas of smoothing parameters and smoothing cumulative pulse profile are derived. A ground simulation system for X-ray pulsar navigation is built. The recording of the time of single photon arrival of the simulated X-ray pulsar and the construction of the pulse profile of the X-ray pulsar are realized. The X-ray pulse arrival time (TOA.) is obtained. The smoothing algorithm is verified in the X-ray pulsar navigation ground simulation system. The results show that the proposed algorithm can improve the signal-to-noise ratio (SNR) of the cumulative pulse profile with a signal-to-noise ratio (SNR) greater than 10 dB.
【作者单位】: 中国科学院西安光学精密机械研究所瞬态光学与光子技术国家重点实验室;中国科学院研究生院;
【分类号】:P145.6
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1 倪广仁,杨廷高;毫秒脉冲星计时和原子时[J];计量学报;2001年04期
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