24 October 2013 X-ray photon time tagging error analysis and simulation for pulsar navigation
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X-ray pulsar provides stable, predictable and unique signatures, which is attractive for spacecraft navigation. An X-ray pulsar timing instrument based on semiconductor detectors is assigned to detect the X-ray photon. The time tagging error arises from the detector and the pulse signal processing chain. Considering these factors, we find that the time tagging error is dominated by the design parameters of the processing circuits at low count rate. The contribution of the detector time resolution increases rapidly as the shaping time constant reduces at high count rate, which is critical for X-ray pulsar navigation. A correction program is performed to improve the time tagging accuracy at various photon energies and count rates, so that the random error is minimized. The signal risetime and delay time of the constant fraction discriminator are simulated to get optimum levels. The photon time tagging error could be reduced by using a fast shaping filter and optimum designed constant fraction discriminator.
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Jianwu Chen, Jianwu Chen, Liansheng Li, Liansheng Li, Fuchang Zuo, Fuchang Zuo, Zhiwu Mei, Zhiwu Mei, "X-ray photon time tagging error analysis and simulation for pulsar navigation", Proc. SPIE 8889, Sensors, Systems, and Next-Generation Satellites XVII, 888924 (24 October 2013); doi: 10.1117/12.2028613; https://doi.org/10.1117/12.2028613

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