【摘要】：基于X射線脈沖星導(dǎo)航是一種新型的導(dǎo)航方式,其通過X射線脈沖到達(dá)時(shí)間的探測(cè)以獲得空間位置坐標(biāo),但X射線無法穿透大氣層,故需要進(jìn)行地面驗(yàn)證探測(cè)實(shí)驗(yàn)。針對(duì)上述需求,本文搭建了X射線脈沖星信號(hào)探測(cè)的地面驗(yàn)證系統(tǒng),并對(duì)系統(tǒng)中的關(guān)鍵技術(shù)進(jìn)行了深入分析,該系統(tǒng)能夠模擬X射線脈沖星的流量信號(hào),實(shí)現(xiàn)微弱光子信號(hào)的探測(cè),并根據(jù)導(dǎo)航需求,進(jìn)行X射線脈沖星波形輪廓的還原。 X射線脈沖星信號(hào)探測(cè)的地面驗(yàn)證技術(shù)研究是開展深空導(dǎo)航的基礎(chǔ),對(duì)于實(shí)際應(yīng)用有著重大的參考價(jià)值,本課題將從驗(yàn)證平臺(tái)的各個(gè)組成部分入手,對(duì)驗(yàn)證技術(shù)進(jìn)行分析,研究內(nèi)容主要涉及以下幾個(gè)方面： 1)脈沖星數(shù)據(jù)庫的建立。脈沖星數(shù)據(jù)庫是導(dǎo)航的基礎(chǔ)也是進(jìn)行信號(hào)模擬的關(guān)鍵,本文通過國外各脈沖星數(shù)據(jù)庫的查詢以及數(shù)據(jù)處理獲取基本脈沖星參數(shù),同時(shí)走訪國內(nèi)天文臺(tái),了解相關(guān)脈沖星資訊以完善數(shù)據(jù)庫內(nèi)容,目前數(shù)據(jù)庫中已有部分脈沖星參數(shù),并且在不斷豐富中。 2)X射線脈沖星信號(hào)模擬。本文針對(duì)X射線脈沖星信號(hào)特點(diǎn),采用柵控X射線管進(jìn)行信號(hào)模擬,并對(duì)信號(hào)源關(guān)鍵參數(shù)及柵控電路進(jìn)行了設(shè)計(jì),可實(shí)現(xiàn)數(shù)據(jù)庫與控制電路的數(shù)據(jù)通訊和波形控制。 3)X射線傳感器分析及對(duì)應(yīng)探測(cè)電路設(shè)計(jì)。本文分析了提高X射線探測(cè)器探測(cè)精度的關(guān)鍵指標(biāo),優(yōu)選了Si-PIN探測(cè)器作為驗(yàn)證傳感器,并針對(duì)信號(hào)特性設(shè)計(jì)了信號(hào)檢測(cè)處理電路,并實(shí)現(xiàn)與上位機(jī)的通訊。 4)整體平臺(tái)結(jié)構(gòu)設(shè)計(jì)。結(jié)合X射線對(duì)人體的輻射危害以及X射線在空氣中的衰減情況設(shè)計(jì)了屏蔽結(jié)構(gòu)和真空結(jié)構(gòu),能夠?qū)崿F(xiàn)平臺(tái)各個(gè)部分的良好組合,并通過實(shí)際仿真和實(shí)驗(yàn)證明對(duì)應(yīng)結(jié)構(gòu)能夠起到良好的屏蔽效果,真空腔體也能夠承受對(duì)應(yīng)大氣壓力。 最后針對(duì)性地設(shè)計(jì)實(shí)驗(yàn),對(duì)X射線光子時(shí)間信號(hào)進(jìn)行了歷元折疊,得到脈沖星累積輪廓。
[Abstract]:X-ray pulsar navigation is a new type of navigation method, which can obtain the coordinates of space position by detecting the arrival time of X-ray pulses, but X-ray can not penetrate the atmosphere, so it is necessary to conduct ground verification exploration experiments. To meet the above requirements, a ground verification system for X-ray pulsar signal detection is built, and the key technologies of the system are analyzed in depth. The system can simulate the flow signals of X-ray pulsars. To realize the detection of weak photon signals and to restore the waveform profile of X-ray pulsars according to the navigation requirements, the ground verification technology of X-ray pulsars signal detection is the foundation of deep space navigation. It is of great reference value for practical application. This subject will start with each component of the verification platform and analyze the verification technology. The main contents of the research are as follows: 1) the establishment of pulsar database. Pulsar database is the basis of navigation and the key to signal simulation. This paper obtains the basic pulsar parameters through the query and data processing of the pulsar database in foreign countries, and visits the domestic observatories at the same time. To understand the relevant pulsar information to improve the database content, there are some pulsar parameters in the database at present, and in a growing number of. 2) X-ray pulsar signal simulation. In this paper, according to the characteristics of X-ray pulsar signal, the signal is simulated by gate controlled X-ray tube, and the key parameters of signal source and gate control circuit are designed. Data communication and waveform control between database and control circuit can be realized. 3) X-ray sensor analysis and corresponding detection circuit design. In this paper, the key index to improve the detection accuracy of X-ray detector is analyzed, the Si-PIN detector is selected as the verification sensor, and the signal detection and processing circuit is designed according to the signal characteristics. And realize the communication with the host computer. 4) the overall platform structure design. The shielding structure and vacuum structure are designed in combination with the radiation damage to human body caused by X-ray and the attenuation of X-ray in the air, which can realize the good combination of each part of the platform. The simulation and experiments show that the corresponding structure has good shielding effect and the vacuum cavity can bear the corresponding atmospheric pressure. Finally, experiments are designed to fold the X-ray photon time signals and obtain the cumulative profile of pulsars.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：P128.4

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本文編號(hào)：2158817