本文關(guān)鍵詞：新體制偏移載波調(diào)制信號研究與設(shè)計　出處：《電子科技大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 偽碼擴(kuò)頻體制 二進(jìn)制偏移載波 多相關(guān)峰模糊 掃頻二進(jìn)制偏移載波調(diào)制 跳頻二進(jìn)制偏移載波調(diào)制 副峰抑制

【摘要】：隨著時代的發(fā)展,測控、導(dǎo)航在科學(xué)研究、軍事對抗,以及日常生活中的應(yīng)用越來越廣泛、聯(lián)系越來越緊密,因此,對于測控、導(dǎo)航系統(tǒng)能夠提供的測距、測速、定位的精度和靈敏度的要求也隨之提高,同時,安全性能、抗干擾性能也是重要的考慮因素。針對以上需求,二進(jìn)制偏移載波調(diào)制體制(Binary Offset Carrier,BOC)及其各類衍生調(diào)制體制以其尖銳的相關(guān)峰、分裂的功率譜、更高的測距精度而成為研究熱點(diǎn)。但是,BOC調(diào)制信號自相關(guān)函數(shù)的多相關(guān)峰特性易于導(dǎo)致錯鎖乃至失鎖,從而帶來測距偏差,因此BOC調(diào)制信號接收機(jī)必須設(shè)計無模糊跟蹤算法來確保碼跟蹤環(huán)鎖定正確的相關(guān)峰,這些都將犧牲算法復(fù)雜度和實(shí)現(xiàn)難度。該文旨在BOC調(diào)制數(shù)學(xué)模型的基礎(chǔ)上進(jìn)行改進(jìn),提出了新體制偏移載波調(diào)制體制:掃頻二進(jìn)制偏移載波調(diào)制(Frequency Chirp-BOC,FC-BOC)和跳頻二進(jìn)制偏移載波調(diào)制(Frequency Hop-BOC,FH-BOC)。這兩種調(diào)制的產(chǎn)生是通過將BOC調(diào)制數(shù)學(xué)模型中的二進(jìn)制偏移載波改進(jìn)為線性掃頻或跳頻二進(jìn)制偏移載波,使之具有了許多繼承自BOC調(diào)制的性質(zhì)而又具有了更加獨(dú)特的性質(zhì)。仿真研究和算法實(shí)驗(yàn)表明:FC-BOC調(diào)制與FH-BOC調(diào)制一方面保留了BOC調(diào)制體制的主要優(yōu)點(diǎn),即尖銳的主相關(guān)峰和頻譜公用特性;另一方面又有著出色的副峰抑制特征從而避免多相關(guān)峰模糊,并且功率譜密度函數(shù)呈現(xiàn)類似帶通/帶限白噪聲功率譜密度函數(shù)的形態(tài)從而具有優(yōu)良的匿蹤性能和抗截獲性能;再者,由于FH-BOC調(diào)制是在基帶實(shí)現(xiàn)跳頻,從而克服了跳頻信號由于載波不連續(xù),不能用于載波精確測距的問題。新體制偏移載波調(diào)制(FC-BOC和FH-BOC)在擁有上述優(yōu)良性質(zhì)的情況下,其信號生成算法、接收算法的結(jié)構(gòu)與常規(guī)BOC調(diào)制信號類似、復(fù)雜度相當(dāng),易于工程實(shí)現(xiàn)。由此可以看出,新體制偏移載波調(diào)制(FC-BOC和FH-BOC)能夠作為一種新型的偽碼擴(kuò)頻測量體制應(yīng)用于高精度的測距、測速、導(dǎo)航應(yīng)用之中。
[Abstract]:With the development of the times, measurement and control, navigation in scientific research, military confrontation, as well as daily life in the application of more and more extensive, more and more closely linked, therefore, for the measurement and control, navigation system can provide ranging. Speed measurement, positioning accuracy and sensitivity requirements are also increased, at the same time, security performance, anti-jamming performance is also an important consideration. Binary Offset Carrier Modulation (BOC) and its various derivative modulation schemes have sharp correlation peaks and split power spectra. Higher ranging accuracy has become a research hotspot, but the multi-correlation peak characteristics of BOC modulation signal are prone to lead to mislocks and even lock-ups, resulting in ranging errors. Therefore, the BOC modulation signal receiver must design a fuzzy-free tracking algorithm to ensure that the code tracking loop locks the correct correlation peak. All of these will sacrifice the complexity of the algorithm and the difficulty of implementation. This paper aims to improve the mathematical model of BOC modulation. In this paper, a new carrier offset modulation scheme is proposed, which is the sweep binary offset carrier modulation (Chirp-BOC). FC-BOC) and frequency-hopping binary offset carrier modulation (Hop-BOC). These two kinds of modulation are produced by improving the binary offset carrier in the mathematical model of BOC modulation to linear sweep or frequency-hopping binary offset carrier. It has many properties inherited from BOC modulation and has more unique properties. Simulation research and algorithm experiments show that:. On the one hand, FC-BOC modulation and FH-BOC modulation retain the main advantages of BOC modulation system. The sharp main correlation peak and spectrum common characteristic; On the other hand, it has excellent side peak suppression characteristics to avoid multiple correlation peak ambiguity. The power spectral density function is similar to the band-pass / band-limited white noise power spectral density function, so it has good traceability and anti-interception performance. Furthermore, frequency hopping is realized in baseband by FH-BOC modulation, which overcomes frequency hopping signal because of carrier discontinuity. New system offset carrier modulation FC-BOC and FH-BOC have their signal generation algorithm in the case of the above excellent properties. The structure of the receiving algorithm is similar to that of the conventional BOC modulation signal, which has the same complexity and is easy to be implemented in engineering. The new system offset carrier modulation FC-BOC and FH-BOC can be used as a new pseudo-code spread spectrum measurement system for high-precision ranging, velocity measurement and navigation applications.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN911.3

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本文編號：1392345