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Improving Pulse Phase Estimation Accuracy with Sampling and Weighted Averaging

Published online by Cambridge University Press:  05 February 2019

Haoye Lin  and
Bo Xu
Haoye Lin
Affiliation:
(School of Astronomy and Space Science, Nanjing University, Nanjing 210023, China)
Bo Xu*
Affiliation:
(School of Aeronautics and Astronautics, Sun Yet-sen University, Guangzhou 510006, China)
*
(E-mail: [email protected])
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Abstract

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.

Keywords

X-ray Pulsar based navigationPulse phase estimationSamplingWeighted averaging
Type
Research Article
Information
The Journal of Navigation , Volume 72 , Issue 4 , July 2019 , pp. 1007 - 1020
Copyright
Copyright © The Royal Institute of Navigation 2019 

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References

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