基于頻譜感知的自適應(yīng)跳頻抗干擾通信系統(tǒng)的仿真研究
發(fā)布時間：2018-05-14 23:27
本文選題：隨機矩陣?yán)碚?/strong> + 頻譜感知��； 參考：《電子科技大學(xué)》2014年碩士論文
【摘要】：隨著通信對抗技術(shù)的發(fā)展,電磁環(huán)境日益惡劣,通信系統(tǒng)隨時會遭到敵方的干擾和破壞,因此對電磁環(huán)境的偵察技術(shù)和通信系統(tǒng)的抗干擾技術(shù)成為了通信對抗技術(shù)的關(guān)鍵。本文主要針對頻譜感知技術(shù)、跳頻通信技術(shù)和自適應(yīng)抗干擾技術(shù)這三方面,對自適應(yīng)跳頻抗干擾通信技術(shù)進(jìn)行了深入的研究。干擾信號的頻譜感知算法的研究。為了準(zhǔn)確地認(rèn)知干擾信號,針對噪聲不確定性因素的影響,提出了一種新型頻譜感知算法——基于矩陣特征值極值與能量比值(Range of Eigenvalue-Energy Detection,RE-ED)的頻譜感知算法。本文根據(jù)隨機矩陣?yán)碚?Random Matrix Theory,RMT),利用一種多定向天線接收方法,對接收信號采樣協(xié)方差矩陣的特征值極差與平均能量進(jìn)行了分析與研究,提出了RE-ED算法。通過對該算法進(jìn)行仿真,結(jié)果表明,該算法較之傳統(tǒng)頻譜感知方法,不但有效地克服了噪聲不確定度對判決的影響,而且在信噪比良好的情形下檢測概率收斂于1。在應(yīng)用中采用ED算法與RE-ED算法結(jié)合的方法,在信噪比惡化并且噪聲不確定性影響的情形下保證了整體檢測概率大于0.6。跳頻通信模型的建立。為自適應(yīng)抗干擾系統(tǒng)提供仿真平臺,設(shè)計一個符合指標(biāo)的跳頻通信系統(tǒng)。首先,對跳頻通信系統(tǒng)進(jìn)行了詳細(xì)分析,包括跳頻系統(tǒng)的原理、數(shù)學(xué)模型以及主要特點。其次,對跳頻系統(tǒng)的主要參數(shù)進(jìn)行了分析,并針對后續(xù)自適應(yīng)抗干擾系統(tǒng)的研究對跳頻通信系統(tǒng)的提出了相應(yīng)的指標(biāo)要求。最后,對跳頻系統(tǒng)進(jìn)了建模和仿真分析,達(dá)到了系統(tǒng)設(shè)計的4項指標(biāo)。自適應(yīng)跳頻抗干擾通信技術(shù)的系統(tǒng)仿真與實現(xiàn)。針對復(fù)雜的干擾信號,在跳頻通信系統(tǒng)仿真平臺之上提出了三種自適應(yīng)抗干擾系統(tǒng)。首先,對常見的通信干擾系統(tǒng)進(jìn)行了分類,并將干擾信號分為阻塞式干擾、寬帶全頻段干擾和跟蹤式干擾三種干擾類型。其次,針對這三種干擾類型提出了對應(yīng)的自適應(yīng)抗干擾跳頻通信系統(tǒng),分別為擾隙自適應(yīng)跳頻抗干擾系統(tǒng)、功率自適應(yīng)抗干擾系統(tǒng)和跳速自適應(yīng)抗干擾系統(tǒng)。最后,對三種自適應(yīng)抗干擾跳頻通信系統(tǒng)分別進(jìn)行了理論研究、參數(shù)分析以及建模仿真,并分別對仿真結(jié)果進(jìn)行了分析總結(jié)。結(jié)果表明三種自適應(yīng)跳頻干擾系統(tǒng)頻譜避免了被干擾頻譜淹沒,達(dá)到了成功抗干擾的通信效果。同時均使得誤碼率收斂于0.05以下,收斂率均大于85%,從而也反映了自適應(yīng)抗干擾系統(tǒng)的抗干擾效果明顯。
[Abstract]:With the development of communication countermeasure technology, the electromagnetic environment is getting worse and worse, and the communication system will be interfered and destroyed by the enemy at any time. Therefore, the reconnaissance technology of electromagnetic environment and the anti-jamming technology of communication system have become the key of communication countermeasure technology. In this paper, the spectrum sensing technology, frequency hopping communication technology and adaptive anti-jamming technology are studied deeply. Research on spectrum sensing algorithm of interference signal. A novel spectrum sensing algorithm based on the matrix eigenvalue extremum and energy ratio (range of Eigenvalue-Energy detection RE-ED) is proposed to accurately recognize the interference signal and to deal with the effect of noise uncertainty. In this paper, based on the random Matrix theory, a multi-directional antenna receiving method is used to analyze and study the eigenvalue range and average energy of the sampling covariance matrix of the received signal, and a RE-ED algorithm is proposed. The simulation results show that the proposed algorithm not only overcomes the influence of noise uncertainty on the decision, but also converges to 1 when the signal-to-noise ratio is good. In the application, Ed algorithm combined with RE-ED algorithm is used to ensure the overall detection probability greater than 0.6 under the condition of the deterioration of SNR and the influence of noise uncertainty. The establishment of frequency hopping communication model. To provide a simulation platform for adaptive anti-jamming system, a frequency hopping communication system is designed. Firstly, the FH communication system is analyzed in detail, including the principle, mathematical model and main features of FH system. Secondly, the main parameters of frequency hopping system are analyzed, and the corresponding index requirements of frequency hopping communication system are put forward for the study of subsequent adaptive anti-jamming system. Finally, the FH system is modeled and simulated, and four indexes of the system design are achieved. System simulation and implementation of adaptive frequency hopping anti-jamming communication technology. Based on the simulation platform of frequency hopping communication system, three adaptive anti-jamming systems are proposed for complex jamming signals. Firstly, the common communication jamming systems are classified, and the jamming signals are divided into three types: blocking jamming, wideband full-band jamming and tracking jamming. Secondly, the corresponding adaptive anti-jamming frequency hopping communication system is proposed for these three kinds of interference types, which are the interference gap adaptive frequency hopping anti-jamming system, the power adaptive anti-jamming system and the speed hopping adaptive anti-jamming system. Finally, three kinds of adaptive anti-jamming frequency hopping communication systems are studied in theory, parameter analysis and modeling and simulation, and the simulation results are analyzed and summarized respectively. The results show that the spectrum of the three adaptive frequency hopping jamming systems can avoid being swamped by the interference spectrum and achieve a successful anti-jamming communication effect. At the same time, the BER converges below 0.05, and the convergence rate is more than 850.This also reflects the anti-jamming effect of the adaptive anti-jamming system.
【學(xué)位授予單位】：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
【參考文獻(xiàn)】
相關(guān)期刊論文 前1條
1 姚富強,張毅;干擾橢圓分析與應(yīng)用[J];解放軍理工大學(xué)學(xué)報(自然科學(xué)版);2005年01期
，本文編號：1889956
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