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在X射线脉冲星地面实验系统的仿真源所产生的X射线并经过前置电路转换成光子脉冲的基础上,设计了一种高精度的光子脉冲到达时间测量电路。该时间测量电路采用Xilinx公司的Virtex 5开发板,利用粗时间测量与细时间测量相结合方法,得到从75ps到99 year的高精度大动态范围的时间测量数据。实验仿真结果表明,该时间测量电路具有测量时间动态范围大,精度高,实现成本低,电路稳定性好等特点,为X射线脉冲星导航定位系统的后续数据处理电路提供了高精度的X射线光子脉冲到达时间数据。
Based on the X-ray generated by the simulation source of X-ray pulsar ground experimental system and converted into photon pulse by the pre-circuit, a high-accuracy photon pulse arrival time measurement circuit is designed. The time measurement circuit uses Xilinx’s Virtex 5 development board, using a combination of coarse-time measurement and fine-time measurement to obtain time-measurement data with high accuracy and large dynamic range from 75ps to 99years. The experimental results show that the time measurement circuit has the advantages of large measuring time dynamic range, high precision, low cost and good circuit stability. It provides high-precision X-ray data for the subsequent data processing circuit of X-ray pulsar navigation and positioning system Photon pulse arrival time data.