Abstract
The profile recovery is an important work in X-ray pulsar-based navigation. It is a key step for the analysis on the pulsar signal’s characteristic and the computing of time of arrival (TOA). This paper makes an argument for an algorithm based on the tracking-differentiator (TD) to recover the profile from the low Signal-to-Noise Ratio (SNR) signals. In the method, a TD filter with cascade structure is designed which has very low phase delay and amplitude distortion. In the simulation experiment, two typical pulsars (PSR B0531+21 and PSR B1937+21) are used to verify the algorithm’s performance. The simulation results show that the method satisfies the application requirements in the aspects of SNR and profile fidelity. By processing the data collected by the Rossi X-Ray Timing Explorer (RXTE) satellite in space, similar results can also be achieved.
Highlights
A pulsar is a kind of neutron star rotating rapidly in space
In order to analyze the characteristics of pulsar signal and compute the time of arrival (TOA), the signal profile should be recovered first
The signal processed by the single filter may lead to phase delay which cannot be accepted in the profile recovery application
Summary
A pulsar is a kind of neutron star rotating rapidly in space. An intersection angle exists between the pulsars’ rotation axis and magnetic axis. The European Space Agency (ESA) studied on the feasibility of X-ray pulsar-based navigation in 2004 [6]. The background noise of the pulsar signals includes space background noise, high-energy particle noise, nebula noise, and detector noise. These noises can influence the precision of the pulsar profiles and increase navigation errors. One alternative method is to execute long-time pulsar observation. Xie and Long proposed a tracking-differentiator with a higher precision [15]. It can solve the disturbance problem of the signals effectively, track the input signal without overshooting, and obtain high-quality differential signal [16]. The criterion of Xie and Long’s method is stricter and faster
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
