光子学报, 2014, 43 (12): 1204001, 网络出版: 2014-12-26
基于小波Fisz变换的X射线脉冲星信号降噪研究
De-noising of X-ray Pulsar Signal Based on Wavelet-Fisz Transformation
光子序列 降噪 Wavelet-Fisz变换 X射线脉冲星信号 方差稳定变换 Photon sequence Noise reduction Wavelet-Fisz transformation X-ray pulsar signal VST
摘要
针对X射线脉冲星信号信噪比低, 难以获取精确脉冲星信号相位的问题, 提出了基于Wavelet-Fisz变换的X射线脉冲星信号的估计方法.根据X射线脉冲星信号特性建立了信号模型, 推导了Wavelet-Fisz变换理论, 利用该变换将X射线脉冲星信号逼近于高斯分布, 对变换后的信号数据进行估计.对大量RXTE的实测数据进行分析, 结果表明在Wavelet-Fisz变换下能获得较好的估计性能, 且耗时小, 有利于X射线脉冲星导航的工程应用.
Abstract
As the phase of X-ray pulsar signal is hard to obtain accurately because of low signal noise ratio, a method of estimation based on Wavelet-Fisz transformation for X-ray pulsar signal was proposed. The signal of X-ray pulsars were folded by an enormous number of photon events. The signal model of X-ray pulsar was constructed. The Wavelet-Fisz transformation was derived. The signal of X-ray pulsars were preprocessed to Gaussian distribution by Wavelet-Fisz transformation, then the approximated signal was estimated. Several observation data of RXTE were analyzed, the results show the proposed method has a good performance of estimation, with low overhead of time under Wavelet-Fisz transformation, and is suitable for engineering application of X-ray pulsar navigation.
刘秀平, 景军锋, 孙海峰, 韩丽丽. 基于小波Fisz变换的X射线脉冲星信号降噪研究[J]. 光子学报, 2014, 43(12): 1204001. LIU Xiu-ping, JING Jun-feng, SUN Hai-feng, HAN Li-li. De-noising of X-ray Pulsar Signal Based on Wavelet-Fisz Transformation[J]. ACTA PHOTONICA SINICA, 2014, 43(12): 1204001.