Research On Speed Up And Optimization Of Pulsar Acceleration Search In Frequency Domain

Pulsars are of great research significance for basic science and practical applications.For example,pulsars provide a natural laboratory for strong gravitational field research and an ideal compact state physics laboratory in basic scientific research.The extremely stable characteristic of pulsars' rotation period can realize autonomous navigation and design the most accurate timing system at present in practical applications.Since the landing of Five-hundred-meter Aperture Spherical radio Telescope in Guizhou,China has entered a new milestone on pulsar researches.However,as far as the current situation is concerned,FAST early scientific data center still has great potentials for improvement in the process of pulsar search and optimization.Because of this,we start from the research of pulsar search technology,and combine the actual search process and efficiency of FAST early scientific data center to model and process the distinctive motion characteristics of pulsars and millisecond pulsars in globular clusters.And the correction of the influence of the Doppler effect.Meanwhile we carry out a reasonable optimization for the time-consuming and unfair distribution of computing resources in the search process of the binary pulsar system.First of all,we expound the exploration of pulsars at home and abroad from the aspects of observation equipment,search theory and technology,and list the relevant literature on periodic acceleration search in recent years,and sort out the development and existence of related theories.Secondly,we list the number of pulsar binary star systems and millisecond pulsars in globular clusters till the end of 2020.And concluded that millisecond pulsars mostly exist in binary star systems.Then we introduce the influence of the motion of the binary pulsar system and the Doppler effect on the entire search process in detail.Then,we summarize the whole process of pulsar search,and analysis the influence of the motion of the binary pulsar system.The motion model is simplified and the dimension is reduced to achieve the purpose of signal correction under certain assumptions.Finally,we analysis the two acceleration search technology and draw a conclusion that Fourier Domain Acceleration Search is more suitable for parallel processing.We write a program to realize the parallel processing of the acceleration search.Our benchmark shows that FDAS is 10-12 speed-up compared with the previous version.