基于多波束的导航系统抗干扰技术研究及实现

发布时间：2018-03-13 13:11

本文选题：阵列信号处理　切入点：多波束　出处：《电子科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：全球卫星导航系统利用导航卫星发射导航卫星信号,地面、海洋和空间的用户通过导航接收机享受连续、实时、高精度的定位,以及导航和授时服务。但导航接收机却很容易受到干扰而无法正确提供导航信息,这是因为导航信号达到地面之后的功率极低,且空间存在大量的电磁干扰。同时,受制于美国对全球定位系统(GPS)的控制,以及卫星导航系统在国防建设中具有重要的军事地位,世界各国都加大了对导航抗干扰技术的研究。目前,导航抗干扰系统中应用比较广泛的是基于阵列信号处理的抗干扰算法。本文研究了基于多波束的阵列信号处理技术在导航抗干扰系统中的应用。首先,本文在阵列信号处理技术基础上研究了多波束形成抗干扰算法。在不同的准则约束下,对比了多波束形成算法和传统自适应滤波算法的性能,并仿真对比了在不同情况下的广义旁瓣对消算法的性能。从仿真中能够看出多波束形成算法较传统自适应滤波算法能够在干扰来向上形成零陷的同时在有用信号来向上形成增益波束。其次,本文分析了导航抗干扰系统的总体设计,并对信号处理板进行了详细的分析和硬件设计。同时考虑到波束形成时需要滤波器,又对整个系统中需要的带通滤波器和Hilbert滤波器进行了仿真分析、性能验证和硬件实现。接下来对数字多波束算法的硬件实现进行了详细的分析说明,考虑到硬件资源消耗、实现难易程度及算法性能,本文选择了LMS算法来实现数字多波束算法中自适应处理部分。本文通过MATLAB浮点仿真和FPGA定点仿真验证了算法硬件实现的正确性。最后,利用本文设计的导航抗干扰系统进行外场实验,通过实际的抗干扰性能测试和搜星定位效果,进一步验证了基于多波束的阵列信号处理技术在导航抗干扰系统中的抗干扰能力。
[Abstract]:Global satellite navigation systems use navigation satellites to launch navigation satellite signals, and users of land, ocean and space enjoy continuous, real-time, high-precision positioning through navigation receivers. And navigation and time service. But the navigation receiver is very vulnerable to interference and can not correctly provide navigation information, because the navigation signal after reaching the ground is very low power, and there is a lot of electromagnetic interference in space. At the same time, Subject to the control of GPS by the United States and the important military status of satellite navigation system in national defense construction, countries all over the world have increased their research on navigation anti-jamming technology. The anti-jamming algorithm based on array signal processing is widely used in navigation anti-jamming system. This paper studies the application of array signal processing technology based on multi-beam in navigation anti-jamming system. In this paper, based on array signal processing technology, the anti-jamming algorithm of multi-beam forming is studied, and the performance of multi-beam forming algorithm and traditional adaptive filtering algorithm are compared under different criterion constraints. The performance of the generalized sidelobe cancellation algorithm under different conditions is compared by simulation. It can be seen from the simulation that the multi-beam forming algorithm is more effective than the traditional adaptive filtering algorithm in generating zero trapping when the interference is up and the useful signal can be obtained at the same time. To form a gain beam up. Second, In this paper, the overall design of the navigation anti-jamming system is analyzed, and the signal processing board is analyzed in detail and the hardware is designed. The simulation analysis, performance verification and hardware implementation of the bandpass filter and Hilbert filter are also carried out in the whole system. Then, the hardware implementation of the digital multi-beam algorithm is analyzed in detail, considering the consumption of hardware resources. In this paper, the LMS algorithm is chosen to implement the adaptive processing part of the digital multi-beam algorithm. The correctness of the algorithm is verified by MATLAB floating-point simulation and FPGA fixed-point simulation. Using the navigation anti-jamming system designed in this paper, the anti-jamming ability of array signal processing technology based on multi-beam in navigation anti-jamming system is further verified by the actual anti-jamming performance test and the effect of searching satellite location.
【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】：TN967.1;TN972

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