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为提高X射线脉冲星导航系统的导航精度,提出了一种基于低通滤波器的恒比定时方法,以提高X射线脉冲星导航系统中X射线脉冲到达时间的测量精度.通过设计测量方案,对原有的峰值定时方法和改进后的恒比定时系统的定时精度和死时间进行测量.测量结果表明,峰值定时系统的定时精度和死时间分别为18和4750 ns,恒比定时系统的定时精度和死时间分别为0.78和105 ns,与原有的峰值定时系统相比,采用恒比定时系统的定时精度和死时间均得到明显的提高.在X射线脉冲星导航系统中,通过利用这两种不同定时系统来测量X射线光子的到达时间以构造累积脉冲轮廓.实验结果表明,与峰值定时系统相比,采用改进的恒比定时系统获得的累积脉冲轮廓的信噪比得到明显改善,因此,采用恒比定时系统的导航精度可得到提高.
In order to improve the navigation accuracy of X-ray pulsar navigation system, a constant-ratio timing method based on low-pass filter is proposed to improve the measurement accuracy of X-ray pulse arrival time in X-ray pulsar navigation system.By designing the measurement scheme, The timing accuracy and dead time of the original peak timing method and the improved constant ratio timing system are measured.The measurement results show that the timing accuracy and dead time of the peak timing system are 18 and 4750 ns respectively, The accuracy and dead time are 0.78 and 105 ns, respectively, compared with the original peak timing system, the timing accuracy and dead time of constant ratio timing system are obviously improved.In the X-ray pulsar navigation system, by using this Two different timing systems measure the arrival time of X-ray photons to construct the cumulative pulse profile.The experimental results show that the signal-to-noise ratio of the cumulative pulse profile obtained with the improved constant ratio timing system is significantly improved compared to the peak timing system, Therefore, the navigation accuracy using constant ratio timing system can be improved.