本文關鍵詞： GNSS BDS DOP 仿真 組合導航　出處：《江西理工大學》2014年碩士論文　論文類型：學位論文

【摘要】：隨著現(xiàn)有的GPS、GLONASS系統(tǒng)的現(xiàn)代化，以及BDS、Galileo系統(tǒng)的建成，全球導航衛(wèi)星系統(tǒng)將為未來測量技術帶來新的發(fā)展。未來的全球導航衛(wèi)星系統(tǒng)將為用戶提供更多的衛(wèi)星和信號，以滿足越來越高的導航、定位需求。面對用戶不斷提高的需求，更小、更輕、更快、更環(huán)保的接收機就成為未來的發(fā)展趨勢。但是對于越來越多的衛(wèi)星信號和編碼數量來說，就需要更加高效的處理技術�；诖�，本文對多星座組合衛(wèi)星導航系統(tǒng)的一些關鍵性問題展開研究。 首先，四大全球衛(wèi)星導航系統(tǒng)設計初衷都不盡相同，為了解這四個導航系統(tǒng)之間的差異。本文通過對四大導航系統(tǒng)星座的模擬仿真，對它們在不同高度截止角下中國四個地區(qū)以及全球范圍內的可見衛(wèi)星數、PDOP值和導航精度的統(tǒng)計數據進行分析，得出它們在不同情況下的導航性能數據，為用戶提供參考。 其次，本文通過組合多個導航系統(tǒng)來解決單系統(tǒng)導航性能不足的問題。而多系統(tǒng)的組合導航首先要解決的是數據解算時坐標系和時間系統(tǒng)統(tǒng)一的問題。在討論四個全球衛(wèi)星導航系統(tǒng)坐標和時間系統(tǒng)之間的不同之后，提出了將坐標系統(tǒng)統(tǒng)一到WGS-84坐標系，時間系統(tǒng)統(tǒng)一到國際原子時的解決辦法。 然后，為了解組合衛(wèi)星導航系統(tǒng)的導航性能，本文將不同的導航衛(wèi)星系統(tǒng)進行組合，模擬仿真了單星座，雙星座，三星座、四星座的四個方案，通過仿真數據分析了它們在不同高度截止角下全球范圍內的導航性能。 最后，多星座的組合使得衛(wèi)星數量大幅增加，同時也加大了數據處理的難度。在對大量的仿真數據以及前人成果的研究后，計算出在保證精度前提下的合適可見衛(wèi)星數量。同時針對傳統(tǒng)的選星算法效率比較低這一缺點，提出了改進的選星算法，大大提高了選星的速度，，并通過仿真來驗證了優(yōu)化算法的可行性。
[Abstract]:With the modernization of the existing GPS GLONASS system and the completion of the BDS Galileo system. GNSS will bring new development to the future measurement technology. The future GNSS will provide users with more satellites and signals to meet the increasing navigation. In the face of the increasing demand of users, smaller, lighter, faster and more environmentally friendly receivers will become the trend in the future. But for more and more satellite signals and coding quantity. Therefore, some key problems of multi-constellation integrated satellite navigation system are studied in this paper. First of all, the four major global satellite navigation system design intention is not the same, in order to understand the differences between the four navigation systems, this paper through the four navigation system constellation simulation. The statistical data of PDOP values and navigation accuracy of visible satellites in four regions of China and the whole world at different cutoff angles are analyzed and their navigation performance data under different conditions are obtained. Provide reference for users. Second. In this paper, the problem of insufficient navigation performance of single system is solved by integrating multiple navigation systems. The first problem of integrated navigation of multi-system is the unification of time coordinate system and time system. Four global problems are discussed in this paper. After the difference between the satellite navigation system coordinates and the time system. The solution of unifying the coordinate system to the WGS-84 coordinate system and the time system to the international atomic time is presented. Then, in order to understand the navigation performance of the integrated satellite navigation system, this paper combines different navigation satellite systems, and simulates the four schemes of single constellation, double constellation, Samsung constellation and four constellations. Their global navigation performance at different cutoff angles is analyzed by simulation data. Finally, the combination of multiple constellations greatly increases the number of satellites, but also increases the difficulty of data processing. At the same time, aiming at the low efficiency of traditional star selection algorithm, an improved star selection algorithm is proposed, which greatly improves the speed of star selection. The feasibility of the optimization algorithm is verified by simulation.
【學位授予單位】：江西理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：P228.4

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