Semiphysical Simulation Technique of X-Ray Pulsar Signals Detected at the Spacecraft
Semiphysical Simulation Technique of X-Ray Pulsar Signals Detected at the Spacecraft
复制标题
航天器探测X射线脉冲星信号的半物理模拟技术
DOI：
10.1109/tie.2016.2613060
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发表时间：
2017-02
影响因子：
7.7
通讯作者：
Liu Yanming
中科院分区：
文献类型：
--
作者：
Li Xiaoping;Xue Mengfan;Fang Haiyan;Liu Bing;Sun Haifeng;Liu Yanming
现有的X射线脉冲星信号半物理模拟系统都是假设到达信号的周期在给定的时间跨度内是恒定的，因此不能准确地模拟运动航天器上探测器所看到的光子到达。本文提出了一种替代的半物理仿真技术。在考虑多普勒效应和各种大尺度时空效应的情况下，实时计算光子到达航天器的速率，然后使用高速互连将其传输到数模转换器（DAC）。DAC的输出电压信号与到达速率函数成比例，用于调制可见光源以生成光信号，该光信号在衰减、检测和时间标记之后最终被转换为光子事件时间戳。数模转换避免了使用频率合成的传统方法所产生的截断误差。实验结果表明：模拟数据的观测剖面与真实的数据的观测剖面具有基本一致的形状和随观测时间的变化规律;当观测时间大于140 s时，经过时间变换后，模拟剖面与标准剖面的相关系数达到0.99以上，表明了该模拟技术的有效性和高性能。
The existing semiphysical simulation systems for X-ray pulsar signals are predicated on assuming the period of arrived signal is constant within a given time-span, thus cannot accurately simulate photon arrivals as seen by a detector on a moving spacecraft. In this paper, an alternative semiphysical simulation technique is proposed. The real-time photon arrival rate at the spacecraft is computed considering the Doppler effects and various large-scale time-space effects; then, it is transmitted to the digital-to-analog converter (DAC) using a high-speed interconnect. The output voltage signal of DAC, which is proportional to the arrival rate function, is used to modulate the visible light source to generate an optical signal that is ultimately converted to a photon-event time stamp after attenuation, detection, and time labeling. The digital-to-analog conversion avoids truncation errors that arise with the traditional methods using frequency synthesis. The main experiment results are that the observed profiles of the simulated data have almost the same shape and variation with observation time as those of real data; for observation times longer than 140 s, the correlation coefficients between the simulated profiles and the standard one reach above 0.99 with time-transformation, which indicates the validity and high performance of the proposed simulation technique.
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