【摘要】：直擴(kuò)系統(tǒng)(DSSS)中自適應(yīng)零陷天線具有很強(qiáng)的抗干擾能力,對其進(jìn)行干擾具有重要的軍事應(yīng)用價(jià)值。本文研究了高斯白噪聲、噪聲調(diào)頻、周期性PN碼和時(shí)頻原子干擾在不同條件下對直擴(kuò)系統(tǒng)中自適應(yīng)零陷天線的干擾效果,并完成了各個(gè)干擾樣式及其它相關(guān)模塊的FPGA設(shè)計(jì)與功能仿真,主要內(nèi)容如下：1.描述了直擴(kuò)系統(tǒng)的基本概念和特點(diǎn)；介紹了自適應(yīng)波束成形算法,包括最小方差無失真響應(yīng)(MVDR)算法以及其兩種迭代算法：最小均方(LMS)算法和遞歸最小二乘(RLS)算法。2.概述了通信系統(tǒng)中的干擾準(zhǔn)則,包括時(shí)域準(zhǔn)則、頻域準(zhǔn)則、樣式準(zhǔn)則和功率準(zhǔn)則；論述了高斯白噪聲、噪聲調(diào)頻、周期性PN碼三種傳統(tǒng)干擾樣式和時(shí)頻原子干擾樣式的理論知識,并建立了時(shí)頻原子中Chirplet原子仿真模型。3.根據(jù)天線陣列理論知識、自適應(yīng)波束成形算法和直接序列擴(kuò)頻技術(shù),構(gòu)建了直擴(kuò)系統(tǒng)自適應(yīng)零陷天線仿真模型。4.在干擾平均功率相同的情況下,仿真了不同個(gè)數(shù)的噪聲調(diào)頻干擾、周期性PN碼干擾和升余弦鑲邊Chirplet原子干擾在連續(xù)和閃爍(斷續(xù))條件下的干擾效果,并和單個(gè)連續(xù)高斯白噪聲的干擾效果進(jìn)行比較。結(jié)果表明,干擾個(gè)數(shù)的增多能夠大幅度的改善干擾效果；閃爍(斷續(xù))干擾的干擾效果比連續(xù)干擾略好,但相差不大。5.根據(jù)干擾機(jī)的設(shè)計(jì)要求,給出了其總體設(shè)計(jì)方案,并完成了干擾機(jī)中高斯白噪聲干擾、噪聲調(diào)頻干擾、周期性PN碼干擾、Chirplet原子干擾以及其它相關(guān)模塊的FPGA設(shè)計(jì)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.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN820;TN972

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本文編號：2259625