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针对X射线脉冲星时间延迟测量方法存在的测量精度不高、计算量大等问题,提出了一种基于快速最大似然估计时间延迟测量方法.首先通过历元折叠提取脉冲星脉冲轮廓,在此基础上建立似然函数,进而通过求解最大似然函数得到脉冲轮廓时间延迟量;通过缩小标准脉冲轮廓相位间隔对快速最大似然估计进行改进,采用粗略估计与精细估计相结合的方法精确计算时间延迟量.以脉冲星实测数据为基础,从观测时间和运算量对快速最大似然方法与其他方法进行仿真对比实验,结果表明,文中方法在保证运算效率基本不变的前提下,明显提高了时间延迟测量的精确度.
Aiming at the problems such as low accuracy and large amount of calculation of time delay measurement method of X-ray pulsar, a new method of time delay measurement based on fast maximum likelihood estimation is proposed.First, the pulsar pulse profile is extracted by epoch folding, Based on the establishment of the likelihood function, and then by solving the maximum likelihood function to obtain the pulse contour time delay; by narrowing the standard pulse contour phase interval for fast maximum likelihood estimation is improved, using rough estimation and fine estimation method to accurately calculate the time Delay.According to the measured data of pulsars, the fast maximum likelihood method and other methods are compared with the experimental results from the observation time and the computational load. The results show that the proposed method significantly improves the computational efficiency under the premise of keeping the computational efficiency unchanged Time delay measurement accuracy.