X射线脉冲星导航地面试验系统的仿真源初探
发布时间：2018-08-09 16:23
【摘要】：X射线脉冲星导航是近几年提出的一种深空自主导航的新技术和新方法,它不仅可以实现高可靠、高稳定、高精度的深空自主导航,同时又具有不受人为破坏和干扰、不受近地空间范围限制、不需要建立额外地平信息等优点,在军事和民用上都具有深远的影响,因此倍受各航天大国的青睐。由于X射线难以穿透稠密的大气层,在地面很难探测到脉冲星辐射的X射线信号。同时,在X射线脉冲星自主导航应用之前,必须建立地面仿真系统。因此,研制高轮廓吻合度、高周期稳定度、弱x射线流量匹配的仿真x射线脉冲星源无疑成为X射线脉冲星自主导航技术的关键课题之一。 在对各种调制x射线源进行分析的基础上,本论文提出选用栅控x射线球管作为x射线脉冲星仿真源的x射线发射装置,并根据x射线脉冲星仿真源的需求和栅控X射线球管的特性曲线,分别用直接数字频率合成技术和脉冲宽度调制方法建立了模拟和数字两种调制方式的数学模型。在任意信号发生器与高压电源的共同驱动下,实现了脉冲轮廓高吻合度和强度微弱的X射线脉冲星源的仿真。 为了更好的评价x射线脉冲星仿真源的性能指标,本论文在原有的时域和频域相似度的基础上,提出采用脉冲信号辐射相对脉冲星总辐射的比值pf和脉冲轮廓峰值半宽度W这两个影响导航精度的脉冲轮廓形状参数来评价X射线脉冲星仿真源的性能,改善了X射线仿真源的评价体系。 在实验室搭建的x射线脉冲星导航地面试验系统中,对所设计的模拟调制仿真源进行了测试,仿真了Crab脉冲星的x射线脉冲轮廓,所采集的仿真脉冲轮廓与标准脉冲轮廓时域相关度和频域相关度分别达到了0.9774和0.9853,X射线辐射流量Fx为1.90ph.cm-2·s-1,偏高23%,pf为76.15%,偏大6.15%,W为1.879ms,偏大13%。实验结果表明,本论文设计的模拟调制仿真源对Crab脉冲星的X射线脉冲轮廓进行了很好的仿真。 通过对基于栅控X射线球管的X射线脉冲星仿真源的设计,有效地解决了仿真源脉冲轮廓相似度和流量抑制的问题。同时,仿真源装置采用直接数字频率合成技术合成栅极控制的信号轮廓和数字序列,给仿真源建立高稳定度的时钟系统提供了有效平台,进而为研制高轮廓吻合度、高周期稳定度、弱X射线流量匹配的仿真X射线脉冲星源奠定了基础,为进一步建立完善的X射线脉冲星导航地面试验系统提供了有利的保障,在很大程度上推进了X射线脉冲星自主导航的研究。
[Abstract]:X ray pulsar navigation is a new technology and new method for deep space autonomous navigation proposed in recent years. It can not only achieve high reliability, high stability and high precision autonomous navigation in deep space, but also has the advantages of not being damaged and disturbed by human beings, not restricted by the limits of the space and need to establish extra horizon information. It is in military and civilian use. It has a profound influence, so it is very popular with the big powers. Because the X ray is difficult to penetrate the dense atmosphere, it is difficult to detect the X ray signal of the pulsar radiation on the ground. At the same time, the ground simulation system must be set up before the application of the X ray pulsar autonomous navigation. Therefore, the high contour consistency and high periodic stability are developed. The simulated X - ray pulsar source matching with weak X - ray flow is undoubtedly one of the key topics of X - ray pulsar autonomous navigation technology.
Based on the analysis of various modulation X ray sources, this paper proposes a X ray emission device using a gate controlled X ray tube as a simulation source of X ray pulsars. According to the requirements of the X ray pulsar simulation source and the characteristic curve of the gate controlled X ray tube, direct digital frequency synthesis and pulse width modulation are built respectively. The mathematical model of two modes of analog and digital modulation is set up. Under the common drive of arbitrary signal generator and high voltage power supply, the simulation of X ray pulse star with high pulse contour and weak intensity is realized.
In order to better evaluate the performance index of the X ray pulsar simulation source, on the basis of the original time domain and frequency domain similarity, this paper puts forward two pulse contour shape parameters, which are the ratio PF of the pulse signal radiation relative to the total radiation of the pulsar and the peak half width of the pulse contour, W, to evaluate the imitation of the X ray pulsar. The performance of the real source improves the evaluation system of the X ray simulation source.
In the X ray pulsars navigation ground test system built in the laboratory, the simulated modulation simulation source is tested and the X ray pulse contour of the Crab pulsar is simulated. The time domain correlation and frequency domain correlation of the simulated pulse contour and the standard pulse contour are 0.9774 and 0.9853, and the X ray radiation flow rate Fx is reached. For 1.90ph.cm-2. S-1, the high 23%, the PF 76.15%, the larger 6.15% and the W 1.879ms, the result of the large 13%. experiment shows that the analog modulation simulation source designed in this paper is a good simulation of the X ray pulse contour of the Crab pulsar.
Through the design of the X ray pulsar simulation source based on the gate controlled X ray tube, the problem of similarity and flow suppression of the simulation source is effectively solved. At the same time, the simulation source device uses the direct digital frequency synthesis technology to synthesize the grid controlled signal contour and the digital sequence, and establishes the clock system with high stability for the simulation source. An effective platform is provided, which lays the foundation for developing a simulated X ray pulse source with high contour consistency, high periodic stability and weak X ray flow matching. It provides a favorable guarantee for the further establishment of a perfect X ray pulsar navigation ground test system, and the research on the autonomous navigation of X ray Pulsars in a large range.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：P128.4
本文编号：2174656
[Abstract]:X ray pulsar navigation is a new technology and new method for deep space autonomous navigation proposed in recent years. It can not only achieve high reliability, high stability and high precision autonomous navigation in deep space, but also has the advantages of not being damaged and disturbed by human beings, not restricted by the limits of the space and need to establish extra horizon information. It is in military and civilian use. It has a profound influence, so it is very popular with the big powers. Because the X ray is difficult to penetrate the dense atmosphere, it is difficult to detect the X ray signal of the pulsar radiation on the ground. At the same time, the ground simulation system must be set up before the application of the X ray pulsar autonomous navigation. Therefore, the high contour consistency and high periodic stability are developed. The simulated X - ray pulsar source matching with weak X - ray flow is undoubtedly one of the key topics of X - ray pulsar autonomous navigation technology.
Based on the analysis of various modulation X ray sources, this paper proposes a X ray emission device using a gate controlled X ray tube as a simulation source of X ray pulsars. According to the requirements of the X ray pulsar simulation source and the characteristic curve of the gate controlled X ray tube, direct digital frequency synthesis and pulse width modulation are built respectively. The mathematical model of two modes of analog and digital modulation is set up. Under the common drive of arbitrary signal generator and high voltage power supply, the simulation of X ray pulse star with high pulse contour and weak intensity is realized.
In order to better evaluate the performance index of the X ray pulsar simulation source, on the basis of the original time domain and frequency domain similarity, this paper puts forward two pulse contour shape parameters, which are the ratio PF of the pulse signal radiation relative to the total radiation of the pulsar and the peak half width of the pulse contour, W, to evaluate the imitation of the X ray pulsar. The performance of the real source improves the evaluation system of the X ray simulation source.
In the X ray pulsars navigation ground test system built in the laboratory, the simulated modulation simulation source is tested and the X ray pulse contour of the Crab pulsar is simulated. The time domain correlation and frequency domain correlation of the simulated pulse contour and the standard pulse contour are 0.9774 and 0.9853, and the X ray radiation flow rate Fx is reached. For 1.90ph.cm-2. S-1, the high 23%, the PF 76.15%, the larger 6.15% and the W 1.879ms, the result of the large 13%. experiment shows that the analog modulation simulation source designed in this paper is a good simulation of the X ray pulse contour of the Crab pulsar.
Through the design of the X ray pulsar simulation source based on the gate controlled X ray tube, the problem of similarity and flow suppression of the simulation source is effectively solved. At the same time, the simulation source device uses the direct digital frequency synthesis technology to synthesize the grid controlled signal contour and the digital sequence, and establishes the clock system with high stability for the simulation source. An effective platform is provided, which lays the foundation for developing a simulated X ray pulse source with high contour consistency, high periodic stability and weak X ray flow matching. It provides a favorable guarantee for the further establishment of a perfect X ray pulsar navigation ground test system, and the research on the autonomous navigation of X ray Pulsars in a large range.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：P128.4
【参考文献】
中国期刊全文数据库 前1条
1 胡黎强,林争辉,李晓庆;改进型脉宽调制DC/DC变换芯片的实现[J];半导体技术;2002年03期
，本文编号：2174656
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