基于星光多普勒的脉冲星脉冲到达时间补偿

Pulsar pulse time-of-arrival compensation based on star light Doppler

为了有效抑制多普勒效应对脉冲到达时间精度的影响,提出了一种基于星光多普勒的脉冲星脉冲到达时间补偿方法.该方法首先根据多颗恒星的星光多普勒频移解算出高精度航天器速度信息,然后利用该速度信息对X射线探测器获得的脉冲光子到达时间进行补偿,最后利用历元叠加法累积脉冲光子获得脉冲到达时间.该方法能有效抑制航天器高速运动对脉冲到达时间的不利影响,理论分析和实验结果表明了该方法的可行性和有效性;该方法的补偿精度比轨道外推方法高出两个数量级,且该方法的鲁棒性比轨道外推方法更强.

In order to restrain the Doppler effects to the pulse time-of-arrival effectively,a pulsar pulse time-of-arrival compensation method based on star Doppler was proposed.In this method,ac-cording to the star Doppler frequency shift of multi-star,the high-accurate velocity information of spacecraft was solved.Then,the pulse photon time-of-arrival obtained by X-ray detector was compen-sated with the velocity information.Finally,these pulse photons were accumulated to obtain the pulse time-of-arrival by the epoch folding method.The proposed method can restrain the effect of space-craft′s motion to the pulse time-of-arrival.The theoretic analysis and simulation results demonstrate the feasibility and effectiveness of the novel method.The compensation accuracy of the method is two orders of magnitude than that of the orbit propagation method,and the robustness of the method is stronger than that of the orbit propagation method.