本文關(guān)鍵詞：BOC調(diào)制系統(tǒng)性能分析及碼同步技術(shù)的研究　出處：《哈爾濱工業(yè)大學》2014年碩士論文　論文類型：學位論文

  更多相關(guān)文章： BOC調(diào)制 捕獲 跟蹤 跟蹤誤差下界

【摘要】：二進制偏移載波調(diào)制（BOC）以其特殊的裂譜特性，已經(jīng)在新一代的全球衛(wèi)星導航系統(tǒng)中得到了應用和推廣，但是其特殊的自相關(guān)函數(shù)多峰的性質(zhì)給偽碼的精準同步帶來了一定的影響。因此如何能夠降低副峰對接收端的影響，使BOC優(yōu)良的裂譜性能得到最大化的展現(xiàn)變得至關(guān)重要。 本文首先介紹了基本BOC調(diào)制以及由此衍生出的MBOC、AltBOC調(diào)制的產(chǎn)生機理，以及對各種調(diào)制方式的統(tǒng)計特性進行分析，歸納總結(jié)出相應的特點，并分析了參數(shù)的選取、帶限和均方根帶寬對BOC調(diào)制系統(tǒng)性能的影響�；谶@些理論基礎(chǔ)，著重研究了BOC調(diào)制信號偽碼的同步技術(shù)。 在對現(xiàn)有的捕獲方法研究的基礎(chǔ)上，將現(xiàn)有的無模糊的捕獲方法歸納總結(jié)并分成兩類，即對頻譜進行搬移濾波處理頻譜重構(gòu)技術(shù)和對自相關(guān)函數(shù)直接進行改造的捕獲技術(shù)，，綜合分析FOB算法、SOB算法、filtered算法、ASPeCT算法、SCPC算法以及OQCC算法的性能及優(yōu)缺點。進而利用波形重構(gòu)的思想，基于碼并行捕獲算法，推導設計出一種新的去模糊的捕獲算法，并在模擬的衛(wèi)星導航接收系統(tǒng)中，對新算法的捕獲過程進行了仿真驗證。 隨后，對經(jīng)典的跟蹤環(huán)路NELP、VNELP的原理及工作流程進行分析，發(fā)現(xiàn)與其花時間來糾正這些由自相關(guān)函數(shù)的多峰性帶來的錯誤跟蹤的情況，不如直接對環(huán)路進行改進以便直接達到無模糊的跟蹤的目的。利用新算法對傳統(tǒng)的NELP跟蹤環(huán)路進行改進，以期使得新環(huán)路相關(guān)器輸出曲線和BPSK調(diào)制的相關(guān)器輸出曲線相類似，即僅含有一個過零點達到無模糊跟蹤的目的，并研究了相關(guān)間隔對相關(guān)器輸出曲線的影響。最后對跟蹤誤差進行分析，并與偽碼跟蹤的克拉美羅下限和貝葉斯下限進行了比較。
[Abstract]:Binary offset carrier modulation (BOC) has been applied and popularized in the new generation of global satellite navigation system due to its special crack spectrum characteristics. But its special multi-peak character of autocorrelation function has a certain influence on the precise synchronization of pseudo-codes, so how to reduce the influence of the sub-peak on the receiver. It is very important to maximize the crack spectrum properties of BOC. In this paper, we first introduce the basic BOC modulation and the generated mechanism of the BOC modulation, and analyze the statistical characteristics of various modulation methods. The characteristics of BOC modulation system are summarized, and the influence of parameter selection, band limit and root-mean-square bandwidth on the performance of BOC modulation system is analyzed. The synchronization technology of BOC modulation signal pseudo code is studied emphatically. On the basis of the research on the existing capture methods, the existing non-fuzzy capture methods are summarized and divided into two categories. That is to say, the spectrum reconstruction technology and the acquisition technology which can directly transform the autocorrelation function are used to remove and filter the spectrum, and the FOB algorithm is synthetically analyzed. The performance, advantages and disadvantages of ASPeCT algorithm and OQCC algorithm are discussed. Furthermore, the parallel acquisition algorithm is based on the idea of waveform reconstruction. A new de-fuzzy acquisition algorithm is derived and designed, and the acquisition process of the new algorithm is verified by simulation in the simulated satellite navigation receiving system. Then, the principle and workflow of the classical tracking loop NELPNLP are analyzed, and it is found that it takes time to correct the error tracking caused by the multi-peakness of autocorrelation function. It is better to improve the loop directly to achieve the goal of non-fuzzy tracking. The new algorithm is used to improve the traditional NELP tracking loop. It is expected that the output curve of the new loop correlator is similar to the output curve of the correlator modulated by BPSK, that is, the output curve of the new loop correlator has only one beyond 00:00 to achieve the goal of no fuzzy tracking. The influence of correlation interval on the output curve of correlator is studied. Finally, the tracking error is analyzed and compared with Clemero lower bound and Bayesian lower bound of pseudo code tracking.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN96.1

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本文編號：1408030