Daubechies wavelet based denoising method for X-ray pulsar signal

被引：0
作者：
机构：
[1] School of Mechano-Electronics Engineering, Xidian University
[2] School of Electronics Engineering, Xidian University
来源：
Liu, X.-P. (liuxiuping8@126.com) | 1757年 / China Spaceflight Society卷 / 33期
关键词：
Daubechies wavelet; Denoising; Epoch folding; Time of arrival; X-ray pulsar signal;
D O I：
10.3873/j.issn.1000-1328.2012.12.007
中图分类号：
学科分类号：
摘要：
The X-ray pulsar with weak signal buried in strong noise leads to the low signal-to-noise ratio of folded pulse profiles in short time, both estimation accuracy and efficiency are affected. A denoising method for X-ray pulsar is proposed in the paper. By preprocessing and folding the pulse profiles, and the measured data are employed for Daubechies wavelet, the SNR of pulse profile is improved. The RXTE data are used for verification and the simulation results show the method proposed can eliminate the noise from equipments and space environment, thus shorting the observing time and improving the efficiency of X-ray pulsar navigation without reducing the accuracy of TOA.
引用
收藏
页码：1757 / 1761
页数：4
相关论文
共 15 条
  • [1] Sheikh I.S., Golshan A.R., Pines D.J., Absolute and relative position determination using variable celestial X-ray sources, The 30th Ann. AAS Guid. Conf., (2007)
  • [2] Mao Y., Research on X-ray pulsar navigation algorithms, (2009)
  • [3] Sheikh I.S., The use of variable celestial X-ray sources for spacecraft navigation, (2005)
  • [4] Leahy D.A., X-ray pulsar profile analysis, Royal Astronomical Society, 242, pp. 188-193, (1990)
  • [5] Sun J.-R., Xu L.-P., Wang T., Denoising pulsar signals by disspectrum filters, J. Huazhong Univ. of Sci. & Tech. (Natural Science Edition), 38, 8, pp. 9-12, (2010)
  • [6] Wang L., Ke X.-Z., Ni G.-R., Research on noise reduction for millisecond pulsar signal based on wavelet transform, Astronomical Research & Technology, 5, 1, pp. 49-55, (2008)
  • [7] Li J.-X., Ke X.-Z., The masximum-likelihood estimate of TOA accuracy for X-ray pulsar signal based on Poisson process, ACTA Astronmica Sinca, 51, 3, pp. 263-271, (2010)
  • [8] Emadzadeh A.A., Golshan A.R., Jason L., A new relative navigation system based on X-ray pulsar measurementsSpeyer, (2009)
  • [9] Hu H.-J., Zhao B.-S., Sheng L.-Z., Et al., A Simulation experiment system for X-ray pulsar based navigation, Acta Phys. Sin, 60, 2, (2011)
  • [10] Su Z., Xu L.-P., Xie Z.-H., Et al., Pulsar weak signal periodicity detection based on discrete square wave transform, Journal of Astronautics, 30, 6, pp. 2243-2248, (2009)
12