本文選題：副峰抑制　切入點(diǎn)：相關(guān)重構(gòu)　出處：《沈陽理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：北斗(Compass)衛(wèi)星導(dǎo)航系統(tǒng)是一種重大的空間信息基礎(chǔ)設(shè)施,在社會、經(jīng)濟(jì)、軍事和科研等領(lǐng)域被廣泛應(yīng)用。衛(wèi)星導(dǎo)航信號是聯(lián)系空間段、地面段和用戶段的核心紐帶,具有十分獨(dú)特和重要的地位。傳統(tǒng)的Compass導(dǎo)航信號采用QPSK(Quadrature Phase Shift Keying)調(diào)制技術(shù),但沒有充分考慮衛(wèi)星導(dǎo)航系統(tǒng)具有測距和信息傳輸合一的特殊性,沒有很好的解決頻段擁擠等問題,因此Compass新增導(dǎo)航信號隨之發(fā)展并采用BOC(Binary Offset Carrier)族調(diào)制信號。這類調(diào)制技術(shù)具有頻譜分裂的特性,能有效緩解頻段資源短缺的問題。為此,針對B1頻段新增的高階BOC信號和B2頻段新增的AltBOC(Alternate Binary Offset Carrier)信號開展同步方法的研究。對于Compass而言,接收機(jī)對信號的同步能力尤為重要,是信號能夠被正確接收并進(jìn)行處理的前提。因此針對高階BOC信號主副峰間隔小,主副峰分離困難等問題,提出了一種基于互相關(guān)函數(shù)的副峰抑制算法CFVR(Vice peaks restraint with cross-correlation function)。該算法利用相關(guān)函數(shù)重構(gòu)理論,在此基礎(chǔ)上對函數(shù)進(jìn)行左右偏移處理,達(dá)到副峰抑制的目的。針對Alt BOC信號形式復(fù)雜和主峰恢復(fù)困難等問題,提出了一種基于正交副載波的相關(guān)函數(shù)重構(gòu)算法OSCFR(Correlation function reconstruction with orthogonal sub-carrier)。該算法通過借鑒SCPC(Sub-carrier Phase Cancellation)算法的優(yōu)點(diǎn),引入本地正交副載波信號,通過對相關(guān)函數(shù)進(jìn)行超前滯后處理,達(dá)到抑制AltBOC信號副峰的目的。針對BOC族調(diào)制信號的多峰性,為驗(yàn)證各算法的同步性能,本文首先進(jìn)行參數(shù)和指標(biāo)設(shè)置,適應(yīng)性分析,然后從副峰抑制能力和同步概率角度出發(fā),分析不同信噪比下各算法的主峰/第一副峰比值、主峰/最大副峰比值和主峰/平均副峰比值和相關(guān)峰檢測概率情況。在此基礎(chǔ)上,通過仿真對比分析,驗(yàn)證了各算法對信號主峰恢復(fù)能力和副峰抑制能力,以及相關(guān)峰檢測能力。
[Abstract]:The Beidou Compass-satellite navigation system is a major spatial information infrastructure and is widely used in social, economic, military and scientific fields. Satellite navigation signals are the core link between the space segment, the ground segment and the user segment. The traditional Compass navigation signal adopts QPSK(Quadrature Phase Shift Keying modulation technology, but it does not fully consider the particularity of ranging and information transmission in satellite navigation system, and does not solve the problem of frequency band congestion. Therefore, the new navigation signal of Compass is developed and the modulation signal of BOC(Binary Offset Carrier family is adopted. This kind of modulation technology has the characteristic of spectrum splitting and can effectively alleviate the problem of the shortage of frequency band resources. The synchronization method of the new high-order BOC signal in B1 band and the new AltBOC(Alternate Binary Offset carrier signal in B2 band is studied. For Compass, the synchronization ability of receiver is particularly important. It is the premise that the signal can be received and processed correctly. Therefore, for the high order BOC signal, the separation between the main and the secondary peaks is small, and the separation of the primary and secondary peaks is difficult. A sub-peak suppression algorithm based on cross-correlation function, CFVR(Vice peaks restraint with cross-correlation function, is proposed. Based on the theory of correlation function reconstruction, the left and right migration of the function is processed. Aiming at the complex form of Alt BOC signal and the difficulty of recovering the main peak, a correlation function reconstruction algorithm based on orthogonal subcarrier, OSCFR(Correlation function reconstruction with orthogonal sub-carrier, is proposed. The algorithm uses the advantages of SCPC(Sub-carrier Phase cancellation algorithm for reference. The local orthogonal subcarrier signal is introduced to suppress the sub-peak of AltBOC signal by processing the correlation function ahead of time. In order to verify the synchronization performance of each algorithm, the multi-peak property of BOC family modulation signal is verified. In this paper, the parameter and index setting, adaptability analysis, and then from the side peak suppression ability and synchronization probability, the ratio of the main peak to the first secondary peak in different SNR algorithms is analyzed. The ratio of the main peak to the maximum side peak, the ratio of the main peak to the average side peak and the detection probability of the correlation peak are obtained. On the basis of this, the recovery ability of the main peak and the suppression ability of the secondary peak of the signal are verified by the simulation and contrast analysis. And correlation peak detection ability.
【學(xué)位授予單位】：沈陽理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN967.1

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本文編號：1599244