本文選題：自適應(yīng)調(diào)零天線 + MVDR算法�。� 參考：《西安電子科技大學(xué)》2014年碩士論文

【摘要】：通信對抗是保護(hù)己方無線通信系統(tǒng)工作正常、削弱或破壞對方無線通信系統(tǒng)的使用效能所采取的措施和行動。通信干擾和抗干擾技術(shù)是通信對抗的重要研究方向。自適應(yīng)調(diào)零天線可以有效削弱來自干擾方向的能量,從而改善信號干擾功率比,是一種提高接收機(jī)抗干擾能力的有效方法;而對自適應(yīng)調(diào)零天線進(jìn)行有效干擾可以顯著降低這種帶有自適應(yīng)調(diào)零天線抗干擾技術(shù)的接收機(jī)的抗干擾效能。本文研究針對具有自適應(yīng)調(diào)零天線的接收機(jī)的高效的干擾樣式和干擾策略。主要研究內(nèi)容如下:1、對自適應(yīng)調(diào)零天線進(jìn)行了理論分析和仿真,重點(diǎn)對MVDR(最小方差無失真響應(yīng))自適應(yīng)算法和MVDR的兩種遞推實(shí)現(xiàn)算法(LMS、RLS)進(jìn)行了詳細(xì)的推導(dǎo)。2、給出了一種改進(jìn)的連續(xù)可變步長LMS遞推實(shí)現(xiàn)算法。該方法根據(jù)接收信號的平均功率來連續(xù)調(diào)整步進(jìn)因子,從而達(dá)到兼顧收斂速度和穩(wěn)態(tài)誤差性能的目的。給出了連續(xù)可變步進(jìn)因子的計(jì)算公式。在多種干擾方式下的仿真結(jié)果表明,使用這種連續(xù)可變步進(jìn)因子比固定步進(jìn)因子的LMS算法可以同時(shí)具有較快的收斂速度和較好的穩(wěn)態(tài)誤差性能。3、研究了基于chirplet原子干擾樣式對應(yīng)用LMS算法遞推實(shí)現(xiàn)的自適應(yīng)調(diào)零天線系統(tǒng)的影響。給出了帶有自適應(yīng)調(diào)零天線的擴(kuò)頻接收機(jī)干擾仿真模型。仿真結(jié)果表明:對于連續(xù)波干擾樣式,chirplet原子干擾和高斯白噪聲干擾的性能基本相同;對于閃爍干擾樣式,chirplet原子的干擾持續(xù)時(shí)間在總時(shí)間中所占的比例越小,則干擾性能越好;對于混合式干擾樣式,如果chirplet原子的平均功率相等,那么干擾持續(xù)時(shí)間在總時(shí)間中所占的比例越小,則干擾性能越好,如果三個(gè)chirplet原子的平均功率是不相等的,而且把強(qiáng)功率干擾推遲發(fā)送,那么推遲發(fā)送時(shí)間越長,干擾性能越好。
[Abstract]:Communication countermeasures are measures and actions taken to protect our wireless communication system from working normally and to weaken or destroy the performance of the other wireless communication system. Communication interference and anti-jamming technology are the important research direction of communication countermeasure. Adaptive zeroing antenna can effectively reduce the energy from the interference direction and improve the signal interference power ratio. It is an effective method to improve the anti-jamming ability of the receiver. The effective interference of the adaptive zero adjusting antenna can significantly reduce the anti-jamming efficiency of the receiver with the adaptive zero adjusting antenna anti-jamming technology. In this paper, efficient interference patterns and jamming strategies for receivers with adaptive zero-adjusting antennas are studied. The main research contents are as follows: 1. The adaptive zero adjusting antenna is analyzed and simulated theoretically. In this paper, the adaptive algorithm of minimum variance distortionless response (MVDR) and two recursive realization algorithms of MVDR (LMS / RLSs) are derived in detail, and an improved continuous variable step size (LMS) recursive realization algorithm is presented. The step factor is continuously adjusted according to the average power of the received signal, so that the convergence rate and the steady-state error performance can be taken into account. The calculation formula of continuous variable step factor is given. The simulation results under various jamming modes show that, The LMS algorithm with continuous variable step factor can have faster convergence speed and better steady-state error performance than that with fixed step factor at the same time. The recursive implementation of LMS algorithm based on chirplet atomic interference pattern is studied. The effect of adaptive zero-adjusting antenna system. The interference simulation model of spread spectrum receiver with adaptive zero-adjusting antenna is presented. The simulation results show that the performance of the continuous wave interference mode chirplet atomic interference and the Gao Si white noise interference is basically the same, and the smaller the proportion of the interference duration to the total time, the better the interference performance. For hybrid interference patterns, if the average power of the chirplet atoms is equal, the smaller the proportion of the interference duration in the total time, the better the interference performance, if the average power of the three chirplet atoms is not equal, The longer the delay time, the better the jamming performance.
【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】：TN975

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相關(guān)期刊論文 前1條

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本文編號：1816602