X射线脉冲星导航系统中脉冲轮廓的探测与拟合  

Detection and Fitting of Pulse Profile for X-RayPulsar Navigation System

作　　者：陈宝梅[1,2] 赵宝升[1,2] 胡慧君[1,2] 盛立志[1,2] 鄢秋荣[1,2] 

机构地区：[1]中国科学院西安光学精密机械研究所瞬态光学与光子技术国家重点实验室,陕西西安710119 [2]中国科学院研究生院,北京100049

出　　处：《光学学报》2011年第5期293-298,共6页Acta Optica Sinica

摘　　要：在原有X射线脉冲星导航地面模拟系统的基础上,提出了新的方法,对该系统的时间分辨率与时间精度进行了优化,进而提高航天器导航的精度与实时性.所采用的具体方法为:1)改进基于微通道板(MCP)的光子计数探测器;2)采用高精度的时间测量系统。比较改进前后的探测系统拟合的脉冲轮廓,分析改进后系统的MCP增益对脉冲轮廓探测的影响。实验结果表明,在同样的实验条件下,改进后的探测系统计数率更高。改进后的探测系统在每块MCP工作电压为-800 V时,Bin的值为1.5 ms,积分200 s后能够得到较好信噪比的脉冲轮廓。Several new methods to improve the time accuracy and resolution based on the original X pulsar navigation ground simulation system are proposed.By these proposed methods,the accuracy and real-time performance of the spacecraft navigation has been enhanced.The methods adopted include： 1） enhancing the performance of the photon counting detector based on micro-channel plate（MCP）;2） using time measurement system with high accuracy.The pulse profile of the original detection system is compared with the pulse profile of the improved detection system,and the gain of MCP which has influence on the detected pulse profile is discussed.The experimental results show that the counting rate of improved detection system becomes higher under the same experimental condition.When the operating voltage of MCP is-800 V in the improved detection system,and the value of Bin is 1.5 ms,a pulse profile with good signal-to-noise ratio（SNR） can be acquired after being integrated for 200 s.

关 键 词：探测器 光子计数探测器 X射线脉冲星导航 脉冲达到时间测量 脉冲轮廓拟合 

分 类 号：P128.4[天文地球—天体测量] TN151.1[天文地球—天文学]