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介绍了X射线脉冲星导航地面模拟光源研究的必要性及非伺服的机械调制方法所存在的问题和缺陷,提出了基于栅控X射线球管的X射线脉冲星辐射脉冲模拟方法,通过电子光学设计计算,对栅控X射线管的电极结构进行设计优化,研制了栅控X射线管和脉冲星模拟光源装置.实验测试了栅控球管的性能,测试结果与理论计算结果基本相符,实现了对X射线的调制;通过基于FPGA的直接数字频率合成方法,产生脉冲星的任意形状脉冲轮廓电压信号,加载至球管控制栅极,并对其出射脉冲轮廓进行测试,结果表明产生的X射线脉冲轮廓逼真程度在95%以上,模拟源频率稳定度约为2×10-11.
This paper introduces the necessity of X-ray pulsar navigation ground simulation light source and the problems and defects of non-servo mechanical modulation method. The X-ray pulsar radiation pulse simulation method based on grid-controlled X-ray tube is proposed. Design and calculation, design and optimization of the electrode structure of the grid-controlled X-ray tube, developed gated X-ray tube and pulsar simulation light source device.Experimental testing of the performance of the grid-controlled ball tube, the test results and the theoretical calculation results are basically the same, to achieve The X-ray modulation was carried out. By means of the direct digital frequency synthesis method based on FPGA, a pulse shape voltage signal of any shape of pulsar was generated and applied to the tube control grid. The output pulse profile of the pulsar was tested and the results showed that the generated X Ray pulse contour realistic degree of more than 95%, analog source frequency stability of about 2 × 10-11.