本文選題：導(dǎo)航衛(wèi)星 + 時頻基準(zhǔn)�。� 參考：《復(fù)旦大學(xué)》2014年碩士論文

【摘要】：精確的導(dǎo)航主要依賴于精確的時間。在導(dǎo)航衛(wèi)星系統(tǒng)中,精確位置的測量實際上是精確時間的測量,而精確的時間來自于精確的時頻基準(zhǔn)信號。高精度的衛(wèi)星時頻基準(zhǔn)信號是整個衛(wèi)星導(dǎo)航系統(tǒng)實現(xiàn)導(dǎo)航定位、授時和測速的基礎(chǔ)。研究高精度的導(dǎo)航時頻基準(zhǔn)源生成技術(shù),是各個國家基礎(chǔ)研究的重點方向,對國家建設(shè)和發(fā)展意義重大。本文第一部分,介紹國內(nèi)外導(dǎo)航衛(wèi)星時頻基準(zhǔn)設(shè)備的研究發(fā)展現(xiàn)狀,給出相關(guān)實現(xiàn)方法和技術(shù)指標(biāo)。并在前人研究的基礎(chǔ)上,梳理出下一代高性能導(dǎo)航定位系統(tǒng)時頻基準(zhǔn)設(shè)備的技術(shù)發(fā)展趨勢。第二部分分析了時頻信號的準(zhǔn)確度、頻率穩(wěn)定度等關(guān)鍵技術(shù)指標(biāo),并給出相關(guān)指標(biāo)的相互轉(zhuǎn)化關(guān)系。在此基礎(chǔ)上,研究基于數(shù)字鎖相環(huán)DPLL和直接數(shù)字頻率合成DDS相混合的導(dǎo)航高精度時頻基準(zhǔn)源生成技術(shù),仿真產(chǎn)生高精度、高穩(wěn)定度、低相噪和低雜散的基準(zhǔn)信號,并分析其性能。作為原理樣機(jī)設(shè)計的理論基礎(chǔ)。第三部分是根據(jù)系統(tǒng)的功能和指標(biāo)要求,提出一種可行的高精度時頻基準(zhǔn)源原理樣機(jī)實現(xiàn)方案,將銣原子鐘輸出10MHz參考信號轉(zhuǎn)換為高可靠、高精度、穩(wěn)定并且連續(xù)的10.23MHz導(dǎo)航衛(wèi)星時頻基準(zhǔn)信號,并進(jìn)行軟硬件實現(xiàn)。最后,針對原理樣機(jī)的關(guān)鍵技術(shù)指標(biāo),進(jìn)行測試驗證,給出具體測試結(jié)果。
[Abstract]:Accurate navigation depends mainly on precise time. In the navigation satellite system, the accurate position measurement is actually the accurate time measurement, but the accurate time comes from the accurate time frequency reference signal. High precision satellite time frequency reference signal is the basis of the whole satellite navigation system to realize navigation positioning, timing and velocity measurement. The research of high-precision time-frequency reference source generation technology is the key direction of basic research in each country, and it is of great significance to national construction and development. In the first part of this paper, the research and development of navigation satellite time-frequency reference equipment at home and abroad are introduced, and the relevant implementation methods and technical specifications are given. On the basis of previous studies, the technical development trend of the next generation high performance navigation and positioning system time-frequency reference equipment is sorted out. In the second part, the key technical indexes, such as accuracy and frequency stability of time-frequency signal, are analyzed, and the relationship between relative indexes is given. On this basis, the high precision time-frequency reference source generation technology based on DPLL and DDS is studied, which can generate high precision, high stability, low phase noise and low spurious reference signal. Its performance is analyzed. As the theoretical basis of prototype design. In the third part, according to the function and index requirement of the system, a feasible prototype of time-frequency reference source with high precision is proposed. The output 10MHz reference signal of rubidium clock is converted into high reliability and high precision. Stable and continuous 10.23 MHz navigation satellite time frequency reference signal, and software and hardware implementation. Finally, the key technical indexes of the principle prototype are tested and verified, and the concrete test results are given.
【學(xué)位授予單位】：復(fù)旦大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN967.1

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本文編號：2014897