Abstract
The pulse time of arrival (TOA) is a determining parameter for accurate
timing and positioning in X-ray pulsar navigation. The pulse TOA can be calculated
by comparing the measured arrival time with the predicted arrival time of the X-ray
pulse for pulsar. In this study, in order to research the measurement of pulse
arrival time, an experimental system is set up. The experimental system comprises a
simulator of the X-ray pulsar, an X-ray detector, a time-measurement system, and a
data-processing system. An X-ray detector base is proposed on the basis of the
micro-channel plate (MCP), which is sensitive to soft X-ray in the 1-10 keV band.
The MCP-based detector, the structure and principle of the experimental system, and
results of the pulse profile are described in detail. In addition, a discussion of
the effects of different X-ray pulse periods and the quantum efficiency of the
detector on pulse-profile signal-to-noise ratio (SNR) is presented. Experimental
results reveal that the SNR of the measured pulse profile becomes enhanced as the
quantum efficiency of the detector increases. The SNR of the pulse profile is higher
when the period of the pulse is smaller at the same integral.
© 2011 Chinese Optics Letters
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