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1 results

  • Improving Pulse Phase Estimation Accuracy with Sampling and Weighted Averaging

  • Haoye Lin, Bo Xu
  • Journal:
    The Journal of Navigation / Volume 72 / Issue 4 / July 2019
    Published online by Cambridge University Press:
    05 February 2019, pp. 1007-1020
    Print publication:
    July 2019

  • The accuracy in an X-ray pulsar-based navigation system depends mainly on the accuracy of the pulse phase estimation. In this paper, a novel method is proposed which combines an epoch folding process and a cross-correlation method with the idea of “averaging multiple measurements”. In this method, pulse phase is estimated multiple times on the sampled subsets of arriving photons' time tags, and a final estimation is obtained as the weighted average of these estimations. Two explanations as to how the proposed method can improve accuracy are provided: a Signal to Noise Ratio (SNR)-based explanation and an “error-difference trade-off” explanation. Numerical simulations show that the accuracy in pulse phase estimation can be improved with the proposed algorithm.