罗兰C接收信号的抗干扰算法研究

发布时间：2018-06-13 02:23

本文选题：罗兰C + 频域滤波　；参考：《西安理工大学》2017年硕士论文

【摘要】：如今星基导航系统在导航领域占据着主导地位,罗兰C系统以其信号功率大、抗干扰能力强等优点仍有存在的意义,常被用来作为星基导航系统的备份手段,弥补其不足。其中,如何能从实际接收到的罗兰C信号中得到比较纯净的罗兰C信号一直以来都是专家学者研究讨论的重点。本文着重研究了罗兰C信号的单频干扰抑制算法并通过识别捕获算法对抑制效果进行了验证。本文首先对罗兰C导航系统进行了分析,由接收前端滤波切入单频干扰抑制算法;然后对经典的自适应滤波单频干扰抑制算法进行了论述,针对其算法中的期望信号在实际应用中生成比较困难这一不足,本文引入了扩频通信抗单频干扰技术,采用频域滤波算法进行单频干扰抑制,并通过Matlab仿真与自适应滤波算法进行了比较,不仅证明频域滤波算法对单频干扰抑制的可行性,而且在能够满足设计要求的前提下比自适应滤波算法更容易实现;最后,详细分析了传统捕获算法和延迟一个GRI捕获算法,并在后者基础上进行了捕获算法的改进,利用相位编码特性,对信号延迟4个脉冲进行相关累积,从而实现了罗兰C信号的捕获。同传统方法比较,这种算法在硬件实现中资源占用更少。本文对上述所提及的两种抗干扰算法和两种延迟捕获算法进行了 Matlab仿真,并对数字带通滤波算法、自适应滤波算法和延迟4个脉冲捕获算法进行了 ISE仿真。通过对上述几种算法原理的阐述和仿真结果的分析对比,充分证明了其设计的正确性和有效性,很好地满足了现代罗兰C数字接收机的设计要求。
[Abstract]:Nowadays, the space-based navigation system plays a leading role in the navigation field. Roland C system is often used as the backup method of the space-based navigation system to make up for its deficiency because of its high signal power and strong anti-jamming ability. How to get the purer Loran-C signal from the actual Loran-C signal has always been the focus of experts and scholars. In this paper, the single frequency interference suppression algorithm of Loran-C signal is studied and the suppression effect is verified by the recognition and acquisition algorithm. In this paper, the Loran-C navigation system is first analyzed, and the single-frequency interference suppression algorithm is cut into the receiver front-end filter, and then the classical adaptive filtering single-frequency interference suppression algorithm is discussed. Aiming at the difficulty of generating the desired signal in practical application, this paper introduces the spread spectrum communication anti-single frequency interference technology, and adopts the frequency domain filtering algorithm to suppress the single frequency interference. The comparison between Matlab simulation and adaptive filtering algorithm not only proves the feasibility of frequency domain filtering algorithm for single frequency interference suppression, but also can be realized more easily than adaptive filtering algorithm on the premise of satisfying the design requirements. The traditional acquisition algorithm and the delay GRI acquisition algorithm are analyzed in detail, and the improvement of the acquisition algorithm is carried out on the basis of the latter. The signal delay four pulses are correlated with each other by using the phase coding characteristic. Thus the acquisition of Roland C signal is realized. Compared with traditional methods, this algorithm occupies less resources in hardware implementation. In this paper, two anti-jamming algorithms and two delay acquisition algorithms mentioned above are simulated by Matlab, and ISE simulation of digital band-pass filtering algorithm, adaptive filtering algorithm and delay four pulse acquisition algorithms are carried out. The correctness and validity of the design are fully proved by the analysis and comparison of the principles of the above algorithms and the simulation results, and the design requirements of the modern Loran-C digital receiver are well met.
【学位授予单位】：西安理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN966

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