新体制偏移载波调制信号研究与设计

发布时间：2018-01-07 11:20

本文关键词：新体制偏移载波调制信号研究与设计　出处：《电子科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着时代的发展,测控、导航在科学研究、军事对抗,以及日常生活中的应用越来越广泛、联系越来越紧密,因此,对于测控、导航系统能够提供的测距、测速、定位的精度和灵敏度的要求也随之提高,同时,安全性能、抗干扰性能也是重要的考虑因素。针对以上需求,二进制偏移载波调制体制(Binary Offset Carrier,BOC)及其各类衍生调制体制以其尖锐的相关峰、分裂的功率谱、更高的测距精度而成为研究热点。但是,BOC调制信号自相关函数的多相关峰特性易于导致错锁乃至失锁,从而带来测距偏差,因此BOC调制信号接收机必须设计无模糊跟踪算法来确保码跟踪环锁定正确的相关峰,这些都将牺牲算法复杂度和实现难度。该文旨在BOC调制数学模型的基础上进行改进,提出了新体制偏移载波调制体制:扫频二进制偏移载波调制(Frequency Chirp-BOC,FC-BOC)和跳频二进制偏移载波调制(Frequency Hop-BOC,FH-BOC)。这两种调制的产生是通过将BOC调制数学模型中的二进制偏移载波改进为线性扫频或跳频二进制偏移载波,使之具有了许多继承自BOC调制的性质而又具有了更加独特的性质。仿真研究和算法实验表明:FC-BOC调制与FH-BOC调制一方面保留了BOC调制体制的主要优点,即尖锐的主相关峰和频谱公用特性;另一方面又有着出色的副峰抑制特征从而避免多相关峰模糊,并且功率谱密度函数呈现类似带通/带限白噪声功率谱密度函数的形态从而具有优良的匿踪性能和抗截获性能;再者,由于FH-BOC调制是在基带实现跳频,从而克服了跳频信号由于载波不连续,不能用于载波精确测距的问题。新体制偏移载波调制(FC-BOC和FH-BOC)在拥有上述优良性质的情况下,其信号生成算法、接收算法的结构与常规BOC调制信号类似、复杂度相当,易于工程实现。由此可以看出,新体制偏移载波调制(FC-BOC和FH-BOC)能够作为一种新型的伪码扩频测量体制应用于高精度的测距、测速、导航应用之中。
[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.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN911.3

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