Compass新增导航信号同步方法研究

发布时间：2018-03-11 17:49

本文选题：副峰抑制　切入点：相关重构　出处：《沈阳理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：北斗(Compass)卫星导航系统是一种重大的空间信息基础设施,在社会、经济、军事和科研等领域被广泛应用。卫星导航信号是联系空间段、地面段和用户段的核心纽带,具有十分独特和重要的地位。传统的Compass导航信号采用QPSK(Quadrature Phase Shift Keying)调制技术,但没有充分考虑卫星导航系统具有测距和信息传输合一的特殊性,没有很好的解决频段拥挤等问题,因此Compass新增导航信号随之发展并采用BOC(Binary Offset Carrier)族调制信号。这类调制技术具有频谱分裂的特性,能有效缓解频段资源短缺的问题。为此,针对B1频段新增的高阶BOC信号和B2频段新增的AltBOC(Alternate Binary Offset Carrier)信号开展同步方法的研究。对于Compass而言,接收机对信号的同步能力尤为重要,是信号能够被正确接收并进行处理的前提。因此针对高阶BOC信号主副峰间隔小,主副峰分离困难等问题,提出了一种基于互相关函数的副峰抑制算法CFVR(Vice peaks restraint with cross-correlation function)。该算法利用相关函数重构理论,在此基础上对函数进行左右偏移处理,达到副峰抑制的目的。针对Alt BOC信号形式复杂和主峰恢复困难等问题,提出了一种基于正交副载波的相关函数重构算法OSCFR(Correlation function reconstruction with orthogonal sub-carrier)。该算法通过借鉴SCPC(Sub-carrier Phase Cancellation)算法的优点,引入本地正交副载波信号,通过对相关函数进行超前滞后处理,达到抑制AltBOC信号副峰的目的。针对BOC族调制信号的多峰性,为验证各算法的同步性能,本文首先进行参数和指标设置,适应性分析,然后从副峰抑制能力和同步概率角度出发,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/平均副峰比值和相关峰检测概率情况。在此基础上,通过仿真对比分析,验证了各算法对信号主峰恢复能力和副峰抑制能力,以及相关峰检测能力。
[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.
【学位授予单位】：沈阳理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN967.1

【参考文献】