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Acta Aeronautica et Astronautica Sinica ›› 2023, Vol. 44 ›› Issue (16): 328073-328073.doi: 10.7527/S1000-6893.2022.28073

• Electronics and Electrical Engineering and Control • Previous Articles     Next Articles

Novel method for pulsar profile recovery with variational bin based on distribution of equal photon

Zhize LI, Wei ZHENG(), Yidi WANG   

  1. College of Aerospace Science and Engineering,National University of Defense Technology,Changsha 410073,China
  • Received:2022-09-29 Revised:2022-12-03 Accepted:2022-12-30 Online:2023-01-13 Published:2023-01-12
  • Contact: Wei ZHENG E-mail:zhengwei@nudt.edu.cn

Abstract:

For most existing methods for pulsar profile recovery, the observation profiles are folded based on the distribution of equal bin interval. With this strategy, the signal processing results will be limited by bin, making it difficult to give consideration to both the Signal-to-Noise Ratio (SNR) of profile and the estimation accuracy of pulse Time of Arrival (TOA). To solve this problem, considering the influence of different regions of pulse profile on signal processing, a profile recovery method based on distribution strategy of equal photon number is studied, and bin changes according to the complete observation information. In addition, to be able to build the best observation pulse profile directly, optimization of variable (varying?) bin interval and number is considered simultaneously, and the optimal bin number for profile recovery is analyzed using the information criterion. Human experience is thus eliminated in determining the number of bin. Simulation results show that the proposed method can accurately recover the observation profiles similar to the pulsar template. Compared to traditional methods, the proposed method can improve the calculation accuracy of phase difference during signal processing by more than 25% with sufficient observation data. In case of insufficient observation data or for millisecond pulsars, the advantages of the method are more obvious, with more prominent features of recovered profile, 3%-7% increase of the index of similarity with the template, and nearly 50% improvement of the corresponding calculation accuracy of phase difference. With simple principle and implementation, the proposed method can effectively improve the accuracy of pulsar signal processing, and is applicable for engineering applications.

Key words: epoch folding, profile recovery, distribution of equal photon number, variational bin, optimal bin number, signal processing

CLC Number: