The Quick Search Algorithm of Pulsar Period Based on Unevenly Spaced Timing Data

Zhou, Qingyong; Ren, Hongxiang; Wu, F. M.; Ji, Jianfeng; Zhai, Zhenhe; Ban, Bohao

doi:10.1007/978-3-642-29187-6_57

Cited by 3 publications

(3 citation statements)

References 3 publications

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“…Step 6: Perform comprehensive super-resolution measurement [38]. Perform a comprehensive measurement with super-resolution estimation to significantly improve the estimation accuracy.…”

Section: The Comprehensive Measurement Of Position and Velocitymentioning

confidence: 99%

Comprehensive Measurement of Position and Velocity in the Transverse Direction Using the Crab Pulsar

Feng,

Zhang,

Chen

et al. 2024

Aerospace

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Traditional X-ray pulsar ranging and velocity measurement methods only estimate the radial position and velocity information of the pulsar. For non-linear orbits, errors in the transverse position and velocity of the pulsar lead to errors in the radial velocity of the pulsar, leading to distortion of the X-ray pulsar profile. Based on this, we propose using the distortion of the pulsar profile to infer the transverse position and velocity information of the pulsar. First, a model of the distortion of the pulsar profile due to errors in the transverse position and velocity is established, and the observable directions of the transverse position and velocity are given separately. Then, considering that the distortions in the pulsar profile caused by errors in the transverse position and velocity are indistinguishable, we establish a reactive motion state measure related to the observable directions for the transverse position and velocity errors as a new observable measure in X-ray pulsar navigation. The experimental results show that the precision of the reactive motion state measure reaches 0.57, equivalent to a position error of 284.50 m or a velocity error of 0.57 m/s.

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“…Step 6: Perform comprehensive super-resolution measurement [38]. Perform a comprehensive measurement with super-resolution estimation to significantly improve the estimation accuracy.…”

Section: The Comprehensive Measurement Of Position and Velocitymentioning

confidence: 99%

Comprehensive Measurement of Position and Velocity in the Transverse Direction Using the Crab Pulsar

Feng,

Zhang,

Chen

et al. 2024

Aerospace

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“…The corresponding period is the inherent period. Currently, typical methods is as follows: the time domain χ 2 method, the fast butterfly epoch folding (FBEF) [15], the Fourier spectrum method [16], the coherent statistic of cyclostationary signal [17], the search method based on maximum correlation variance [18], the Lomb-based χ 2 algorithm [19], the pulsar profile entropy-based method [20], the time-delay compensation method [21] and the profile feature method [22]. All of the above methods need to try to fold the pulsar signals in different periods.…”

Section: Introductionmentioning

confidence: 99%

Fast Butterfly Epoch Folding-Based X-Ray Pulsar Period Estimation With a Few Distorted Profiles

Liu

Ning

et al. 2020

IEEE Access

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The traditional pulsar period estimation method using a single distorted profile averts multiple epoch folding processes, but still has space for accuracy to improve. To give consideration to both accuracy and computational load, we combine the fast butterfly epoch folding (FBEF) with the single distorted profile (SDP)-based pulsar period estimation, and propose the FBEF-based pulsar period estimation with a few distorted profiles (FBEF-FDP), which merely uses a few epoch folding processes to enhance accuracy sharply. Firstly, the fast butterfly epoch folding is used to produce a few distorted pulsar profiles with different periods. And then the single distorted profile-based pulsar period estimation explores each distorted prolife to provide a corresponding distortion degree. Finally, using these distortion degree values, the nonlinear search method for multiple minimums can get an optimal distortion degree estimation. Besides, we prove that distortion degree estimation errors of different accumulative distorted profiles from the same pulsar photon sequence are incompletely correlated. This is the theorical basis that the distortion degree estimation values from the same pulsar photon sequence can be fitted to obtain more highly accurate distortion degree estimation. The computational complexity demonstrates that the computational load increases with the number of groups. Thus, to ensure the real-time of the FBEF-FDP, the number of groups should not be too large. Simulation results demonstrate that the accuracy of the fast butterfly epoch folding-based pulsar period estimation using a few distorted profiles enhances at the cost of a small computational load. INDEX TERMS Distortion measurement, epoch folding, estimation, search methods, X-ray pulsar.

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“…NOMDB [15] is the nominal pulsar parameter database, which provides the current known pulsar parameters for the data handling. XFSEARCH searches for the pulse period and its derivatives from the corrected photon arrival times in the time domain as well as the frequency domain [16,17], and it will update the nominal database's pulsar parameters if necessary. XFOLD generates the pulsar's profile through epoch folding [18] and analyze its timing property.…”

Section: Data Analysis Software Systemmentioning

confidence: 99%

Mission Overview and Initial Observation Results of the X-Ray Pulsar Navigation-I Satellite

Zhang¹,

Peng²,

Huang³

et al. 2017

International Journal of Aerospace Engineering

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The newly launched X-ray pulsar navigation-I (XPNAV-1) is an experimental satellite of China that is designed for X-ray pulsar observation. This paper presents the initial observation results and aims to recover the Crab pulsar's pulse profile to verify the Xray instrument's capability of observing pulsars in space. With the grazing-incidence focusing type instrument working at the soft X-ray band (0.5-10 keV), up to 162 segments of observations of the Crab pulsar are fulfilled, and more than 5 million X-ray events are recorded. Arrival times of photons are corrected to the solar system barycentre, and the 33 ms pulse period is sought out for Crab. Epoch folding of all the corrected photon times generates the refined pulse profile of Crab. The characteristic two-peak profile proves that the Crab pulsar has been clearly seen, so that the conclusion is made that XPNAV-1's goal of being capable of observing pulsars is achieved.

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The Quick Search Algorithm of Pulsar Period Based on Unevenly Spaced Timing Data

Cited by 3 publications

References 3 publications

Comprehensive Measurement of Position and Velocity in the Transverse Direction Using the Crab Pulsar

Comprehensive Measurement of Position and Velocity in the Transverse Direction Using the Crab Pulsar

Fast Butterfly Epoch Folding-Based X-Ray Pulsar Period Estimation With a Few Distorted Profiles

Mission Overview and Initial Observation Results of the X-Ray Pulsar Navigation-I Satellite

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