直扩系统中自适应零陷天线干扰技术研究
发布时间：2018-10-09 14:09
【摘要】：直扩系统(DSSS)中自适应零陷天线具有很强的抗干扰能力,对其进行干扰具有重要的军事应用价值。本文研究了高斯白噪声、噪声调频、周期性PN码和时频原子干扰在不同条件下对直扩系统中自适应零陷天线的干扰效果,并完成了各个干扰样式及其它相关模块的FPGA设计与功能仿真,主要内容如下：1.描述了直扩系统的基本概念和特点；介绍了自适应波束成形算法,包括最小方差无失真响应(MVDR)算法以及其两种迭代算法：最小均方(LMS)算法和递归最小二乘(RLS)算法。2.概述了通信系统中的干扰准则,包括时域准则、频域准则、样式准则和功率准则；论述了高斯白噪声、噪声调频、周期性PN码三种传统干扰样式和时频原子干扰样式的理论知识,并建立了时频原子中Chirplet原子仿真模型。3.根据天线阵列理论知识、自适应波束成形算法和直接序列扩频技术,构建了直扩系统自适应零陷天线仿真模型。4.在干扰平均功率相同的情况下,仿真了不同个数的噪声调频干扰、周期性PN码干扰和升余弦镶边Chirplet原子干扰在连续和闪烁(断续)条件下的干扰效果,并和单个连续高斯白噪声的干扰效果进行比较。结果表明,干扰个数的增多能够大幅度的改善干扰效果；闪烁(断续)干扰的干扰效果比连续干扰略好,但相差不大。5.根据干扰机的设计要求,给出了其总体设计方案,并完成了干扰机中高斯白噪声干扰、噪声调频干扰、周期性PN码干扰、Chirplet原子干扰以及其它相关模块的FPGA设计和功能仿真。
[Abstract]:Adaptive zero trapping antenna in direct spread spectrum (DSSS) system has strong anti-jamming ability and has important military application value. In this paper, the interference effect of Gao Si white noise, noise frequency modulation, periodic PN code and time-frequency atomic interference on adaptive zero trapping antenna in DSSS system under different conditions is studied. The FPGA design and functional simulation of each interference mode and other related modules are completed. The main contents are as follows: 1. This paper describes the basic concepts and characteristics of DSSS systems, and introduces adaptive beamforming algorithms, including the minimum variance distortionless response (MVDR) algorithm and its two iterative algorithms: the least mean square (LMS) algorithm and the recursive least square (RLS) algorithm .2. The interference criteria in communication system, including time-domain criterion, frequency-domain criterion, style criterion and power criterion, are summarized, and Gao Si's white noise and noise frequency modulation are discussed. The theoretical knowledge of three kinds of traditional interference patterns and time-frequency atomic interference patterns of periodic PN codes is discussed, and the simulation model of Chirplet atom in time-frequency atom is established. According to the theory of antenna array, adaptive beamforming algorithm and direct sequence spread spectrum technology, the simulation model of adaptive zero trapping antenna for direct sequence spread spectrum (DSSS) system is built. Under the condition of the same average interference power, the interference effects of different number of noise FM interference, periodic PN code interference and raised cosine edge Chirplet atom interference under continuous and flicker (intermittent) conditions are simulated. And the interference effect of single continuous Gao Si white noise is compared. The results show that the interference effect can be greatly improved by increasing the number of interference, and the interference effect of flicker (intermittent) interference is slightly better than that of continuous interference, but the difference is not significant. According to the design requirements of the jammer, the overall design scheme is given, and the FPGA design and function simulation of Gao Si white noise interference, noise frequency modulation jamming, periodic PN code interference Chirplet atomic interference and other related modules are completed.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN820;TN972
本文编号：2259625
[Abstract]:Adaptive zero trapping antenna in direct spread spectrum (DSSS) system has strong anti-jamming ability and has important military application value. In this paper, the interference effect of Gao Si white noise, noise frequency modulation, periodic PN code and time-frequency atomic interference on adaptive zero trapping antenna in DSSS system under different conditions is studied. The FPGA design and functional simulation of each interference mode and other related modules are completed. The main contents are as follows: 1. This paper describes the basic concepts and characteristics of DSSS systems, and introduces adaptive beamforming algorithms, including the minimum variance distortionless response (MVDR) algorithm and its two iterative algorithms: the least mean square (LMS) algorithm and the recursive least square (RLS) algorithm .2. The interference criteria in communication system, including time-domain criterion, frequency-domain criterion, style criterion and power criterion, are summarized, and Gao Si's white noise and noise frequency modulation are discussed. The theoretical knowledge of three kinds of traditional interference patterns and time-frequency atomic interference patterns of periodic PN codes is discussed, and the simulation model of Chirplet atom in time-frequency atom is established. According to the theory of antenna array, adaptive beamforming algorithm and direct sequence spread spectrum technology, the simulation model of adaptive zero trapping antenna for direct sequence spread spectrum (DSSS) system is built. Under the condition of the same average interference power, the interference effects of different number of noise FM interference, periodic PN code interference and raised cosine edge Chirplet atom interference under continuous and flicker (intermittent) conditions are simulated. And the interference effect of single continuous Gao Si white noise is compared. The results show that the interference effect can be greatly improved by increasing the number of interference, and the interference effect of flicker (intermittent) interference is slightly better than that of continuous interference, but the difference is not significant. According to the design requirements of the jammer, the overall design scheme is given, and the FPGA design and function simulation of Gao Si white noise interference, noise frequency modulation jamming, periodic PN code interference Chirplet atomic interference and other related modules are completed.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN820;TN972
【参考文献】
相关期刊论文 前1条
1 蒋乐;冯文全;;高性能可编程高斯白噪声的设计与实现[J];电子技术应用;2006年08期
，本文编号：2259625
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