X射線脈沖星導(dǎo)航地面試驗系統(tǒng)的仿真源初探
發(fā)布時間：2018-08-09 16:23
【摘要】：X射線脈沖星導(dǎo)航是近幾年提出的一種深空自主導(dǎo)航的新技術(shù)和新方法,它不僅可以實現(xiàn)高可靠、高穩(wěn)定、高精度的深空自主導(dǎo)航,同時又具有不受人為破壞和干擾、不受近地空間范圍限制、不需要建立額外地平信息等優(yōu)點,在軍事和民用上都具有深遠的影響,因此倍受各航天大國的青睞。由于X射線難以穿透稠密的大氣層,在地面很難探測到脈沖星輻射的X射線信號。同時,在X射線脈沖星自主導(dǎo)航應(yīng)用之前,必須建立地面仿真系統(tǒng)。因此,研制高輪廓吻合度、高周期穩(wěn)定度、弱x射線流量匹配的仿真x射線脈沖星源無疑成為X射線脈沖星自主導(dǎo)航技術(shù)的關(guān)鍵課題之一。 在對各種調(diào)制x射線源進行分析的基礎(chǔ)上,本論文提出選用柵控x射線球管作為x射線脈沖星仿真源的x射線發(fā)射裝置,并根據(jù)x射線脈沖星仿真源的需求和柵控X射線球管的特性曲線,分別用直接數(shù)字頻率合成技術(shù)和脈沖寬度調(diào)制方法建立了模擬和數(shù)字兩種調(diào)制方式的數(shù)學(xué)模型。在任意信號發(fā)生器與高壓電源的共同驅(qū)動下,實現(xiàn)了脈沖輪廓高吻合度和強度微弱的X射線脈沖星源的仿真。 為了更好的評價x射線脈沖星仿真源的性能指標(biāo),本論文在原有的時域和頻域相似度的基礎(chǔ)上,提出采用脈沖信號輻射相對脈沖星總輻射的比值pf和脈沖輪廓峰值半寬度W這兩個影響導(dǎo)航精度的脈沖輪廓形狀參數(shù)來評價X射線脈沖星仿真源的性能,改善了X射線仿真源的評價體系。 在實驗室搭建的x射線脈沖星導(dǎo)航地面試驗系統(tǒng)中,對所設(shè)計的模擬調(diào)制仿真源進行了測試,仿真了Crab脈沖星的x射線脈沖輪廓,所采集的仿真脈沖輪廓與標(biāo)準(zhǔn)脈沖輪廓時域相關(guān)度和頻域相關(guān)度分別達到了0.9774和0.9853,X射線輻射流量Fx為1.90ph.cm-2·s-1,偏高23%,pf為76.15%,偏大6.15%,W為1.879ms,偏大13%。實驗結(jié)果表明,本論文設(shè)計的模擬調(diào)制仿真源對Crab脈沖星的X射線脈沖輪廓進行了很好的仿真。 通過對基于柵控X射線球管的X射線脈沖星仿真源的設(shè)計,有效地解決了仿真源脈沖輪廓相似度和流量抑制的問題。同時,仿真源裝置采用直接數(shù)字頻率合成技術(shù)合成柵極控制的信號輪廓和數(shù)字序列,給仿真源建立高穩(wěn)定度的時鐘系統(tǒng)提供了有效平臺,進而為研制高輪廓吻合度、高周期穩(wěn)定度、弱X射線流量匹配的仿真X射線脈沖星源奠定了基礎(chǔ),為進一步建立完善的X射線脈沖星導(dǎo)航地面試驗系統(tǒng)提供了有利的保障,在很大程度上推進了X射線脈沖星自主導(dǎo)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.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：P128.4
本文編號：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.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：P128.4
【參考文獻】
中國期刊全文數(shù)據(jù)庫 前1條
1 胡黎強,林爭輝,李曉慶;改進型脈寬調(diào)制DC/DC變換芯片的實現(xiàn)[J];半導(dǎo)體技術(shù);2002年03期
，本文編號：2174656
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