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The importance of period estimation for pulsars in pulsar searching was discussed. In the paper, the radiation signal from pulsars was modeled as second-order cyclostationary process,and corresponding simulation was done to verify its reasonableness. Based on the model, a novel method was proposed to estimate pulsars’ cyclo-period by the coherent statistic of bispectrum, and then one robust strategy for periodicity searches was provided in order to eliminate its sensitivity to data amount. Using the method, the period of PSR J0437-4715 with single pulse was estimated based on original signal, and the period of PSR B1821-24 with double pulses was also estimated based on simulated signal. Results show that, compared with the classical Fourier-transform method, the algorithm is intuitive, effective, of good performance even in case of lower SNR,and also appropriate for the noncontinuous observing data. The method, though with higher computation complexity, can provide a powerful reference for period estimation of weak pulsar signal.
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Keywords:
- pulsars /
- pulsar searching /
- period estimation /
- cyclostationary signal
[1] Li J X,Ke X Z 2009 Science in China G 52 303
[2] Zhong C X, Yang T G 2007 Acta Phys . Sin. 56 6157 (in Chinese) [仲崇霞、杨廷高 2007 56 6157]
[3] Zhang L, Bian X, Mei D C 2001 Chin. Phys. 10 662
[4] Belczynski K, Kalogera V M, Bulik T 2002 Astrophys. J. 572 407
[5] Stairs I H 2006 Journal of Physics G:Nuclear and Particle Physics 32 259
[6] Joseph H, Taylor J R 1993 Class. Quantum Grav. 10 167
[7] Xie Z H,Xu L P,Ni G R 2008 Acta Phys. Sin. 57 6683(in Chinese)[谢振华、许录平、倪广仁 2008 57 6683]
[8] Lorimer D R 1998 arXiv: 9801091
[9] Lorimer D R, Kramer M 2005 Handbook of Pulsar Astronomy (Cambridge:Cambridge University Press) p127
[10] Zhang H B, Jiang W K, Wan Q 2008 Acta Phys. Sin. 57 313(in Chinese)[张海滨、蒋伟康、万 泉 2008 57 313]
[11] Zhang H B, Jiang W K, Wan Q 2009 Acta Phys. Sin. 58 333 [张海滨、蒋伟康、万 泉 2009 58 333]
[12] Hurd H L, Gerr N L 1991 J. Times Ser. Anal.12 337
[13] John E Hanson,Suneel I Sheikh,Paul H Graventhe 2008 IEEE-ION_PLANS Symposium, Monterey, May 5-8, 2008 p704
[14] Nan R D 2006 Science in China G 49 129
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[1] Li J X,Ke X Z 2009 Science in China G 52 303
[2] Zhong C X, Yang T G 2007 Acta Phys . Sin. 56 6157 (in Chinese) [仲崇霞、杨廷高 2007 56 6157]
[3] Zhang L, Bian X, Mei D C 2001 Chin. Phys. 10 662
[4] Belczynski K, Kalogera V M, Bulik T 2002 Astrophys. J. 572 407
[5] Stairs I H 2006 Journal of Physics G:Nuclear and Particle Physics 32 259
[6] Joseph H, Taylor J R 1993 Class. Quantum Grav. 10 167
[7] Xie Z H,Xu L P,Ni G R 2008 Acta Phys. Sin. 57 6683(in Chinese)[谢振华、许录平、倪广仁 2008 57 6683]
[8] Lorimer D R 1998 arXiv: 9801091
[9] Lorimer D R, Kramer M 2005 Handbook of Pulsar Astronomy (Cambridge:Cambridge University Press) p127
[10] Zhang H B, Jiang W K, Wan Q 2008 Acta Phys. Sin. 57 313(in Chinese)[张海滨、蒋伟康、万 泉 2008 57 313]
[11] Zhang H B, Jiang W K, Wan Q 2009 Acta Phys. Sin. 58 333 [张海滨、蒋伟康、万 泉 2009 58 333]
[12] Hurd H L, Gerr N L 1991 J. Times Ser. Anal.12 337
[13] John E Hanson,Suneel I Sheikh,Paul H Graventhe 2008 IEEE-ION_PLANS Symposium, Monterey, May 5-8, 2008 p704
[14] Nan R D 2006 Science in China G 49 129
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