ACTA AERONAUTICAET ASTRONAUTICA SINICA >
A new estimation algorithm for spin parameters of X-ray pulsar
Received date: 2024-04-14
Revised date: 2024-06-05
Accepted date: 2024-11-04
Online published: 2024-11-14
Supported by
Space Optoelectronic Measurement and Perception Laboratory(LabSOMP-2023-12);National SKA Program of China(2020SKA0120103);National Natural Science Foundation of China(U1831130)
The establishment of pulsar parameter database is an important achievement of pulsar observation, and is also the basis for the study of pulsar applications in space. The improvement of the accuracy of pulsar timing model parameters is of great significance for pulsar applications, such as X-ray pulsar navigation, and time reference maintenance in deep space. However, the radio ephemeris of pulsars cannot meet the needs of X-ray timing analysis. In this paper, the PSR B1937+21 observed by NICER detector is taken as the research object, and a method using RANSAC robust fitting to update pulsar’s spin parameters is proposed. The timing results after updating the spin parameters using the least squares fitting algorithm, the Gauss-Newton iteration method and the RANSAC robust fitting algorithm are compared, and the characteristic changes of pulse profile during parameter updating are analyzed. After the spin parameters are updated, the main trend items in timing residuals are deducted, and the timing accuracy and rotation stability within six years are improved significantly.
Key words: pulsar timing; millisecond pulsar; parameter fit; timing residual; stability
Mengna HAN , Minglei TONG , Yongqiang SHI , Zheyu WANG . A new estimation algorithm for spin parameters of X-ray pulsar[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2025 , 46(3) : 630526 -630526 . DOI: 10.7527/S1000-6893.2024.30526
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