一種基于泊松分布的提高X射線脈沖星脈沖輪廓信噪比的方法
發(fā)布時間:2018-08-24 17:48
【摘要】:論述了X射線脈沖星輻射模型和脈沖輪廓構(gòu)造算法,提出了以Kullback-leibler距離函數(shù)作為評價標準,提高具有泊松分布規(guī)律的X射線脈沖星脈沖輪廓信噪比的平滑算法,推導了平滑參數(shù)和平滑累積脈沖輪廓的計算公式.搭建了X射線脈沖星導航地面模擬系統(tǒng),實現(xiàn)了對模擬X射線脈沖星單光子到達時間的記錄及X射線脈沖星脈沖輪廓的構(gòu)造,得到了X射線脈沖到達時間TOA.在X射線脈沖星導航地面模擬系統(tǒng)上,對平滑算法進行了驗證,結(jié)果表明該算法對于提高累積脈沖輪廓的信噪比效果顯著,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.
【作者單位】: 中國科學院西安光學精密機械研究所瞬態(tài)光學與光子技術(shù)國家重點實驗室;中國科學院研究生院;
【分類號】:P145.6
本文編號: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.
【作者單位】: 中國科學院西安光學精密機械研究所瞬態(tài)光學與光子技術(shù)國家重點實驗室;中國科學院研究生院;
【分類號】:P145.6
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