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X射线脉冲星导航是一种完全自主的导航方式,在深空乃至行星际空间具有潜在的工程应用价值.由于空间飞行试验系统复杂,成本巨大,在实验室环境下高精度地模拟X射线脉冲星信号对数据处理方法和导航方案的验证具有重要意义.针对当前机械转盘式模拟系统中时间稳定度和轮廓精度的不足,提出了一种通过产生的轮廓电压信号直接控制可见光光源,再利用衰减获得光子流,最后经单光子探测和处理电路输出光子到达时间序列的模拟新方法.该方法实现成本低,支持任意X射线脉冲星信号的模拟,且具有高时间稳定度和轮廓精度.详细地讨论了该方法的原理和涉及的关键技术,搭建了X射线脉冲星信号模拟系统,并进行了实验.实验结果表明:该系统大幅提高了X射线脉冲星信号的模拟效果,将模拟脉冲星自转周期的稳定度从现有的10-4提高到10-9;当探测器面积为1m2,探测能谱范围为2—10keV,积分时间为1200s时,模拟的PSRB1509-58观测脉冲轮廓与标准脉冲轮廓的相关系数达到了0.993.
X-ray pulsar navigation is a completely autonomous navigation method, which has potential engineering application in deep space and interplanetary space.Because space flight test system is complex and costly, it can simulate X-ray pulse with high precision in laboratory environment The satellite signal is of great significance to the verification of the data processing method and the navigation scheme.Aiming at the shortcomings of time stability and contour accuracy in the current mechanical turntable simulation system, a method of directly controlling the visible light source by the generated profile voltage signal is proposed, A new simulation method of photon arrival time series through photon detection and processing circuit is presented.It is low in cost and supports the simulation of arbitrary X-ray pulsar signal with high time stability and contour accuracy. The principle of the method and the key technologies involved are discussed.The X-ray pulsar signal simulation system is set up and the experiment is carried out.The experimental results show that the system greatly improves the simulation effect of the X-ray pulsar signal, The stability of the periodicity is increased from the existing 10-4 to 10-9; when the detector area is 1m2, the detection energy Range 2-10keV, the integration time is 1200s, PSRB1509-58 analog pulse profile observed correlation coefficient and standard pulse profile reached 0.993.