【摘要】：數字相控陣雷達因其多工作模式,多目標跟蹤等優(yōu)點,現正廣泛的應用于軍事、民用領域,而這些優(yōu)點的充分運用是與多波束技術緊密相關的。目前,接收多波束技術已經相當成熟了,而與之對應的發(fā)射多波束技術卻還有很多的研究空間。本論文以陣列發(fā)射基本原理為基礎,以數字陣為研究背景,深入研究了數字陣列同時多波束發(fā)射的機理、可能的技術途徑和特點、以及實現過程中遇到的一些工程問題,給出了詳細的理論分析和完整的仿真結果,為數字陣列同時發(fā)射多波束的工程應用提供理論支撐。本文主要從下面幾個方面展開研究工作:1.介紹數字相控陣雷達的發(fā)展歷史,并分析比較傳統(tǒng)相控陣的工作原理(主要是時分模式),對于多目標同時工作存在著不足;而采用了數字陣發(fā)射多波束技術則可以在空域多個范圍內同時工作,甚至可以多種工作模式同時工作。從這個對比中可以發(fā)現數字陣發(fā)射多波束的研究意義。2.以波束形成算法為基礎,分析研究三種發(fā)射多波束的算法:基于FFT的發(fā)射多波束算法,基于正交投影的發(fā)射多波束算法,基于子陣的發(fā)射多波束算法。根據算法的分析和仿真的對比可以發(fā)現,基于正交投影的發(fā)射多波束算法更適合于數字陣的同時發(fā)射多波束形成。3.在算法實現的過程中,會產生很多工程問題,本文就發(fā)射多波束系統(tǒng)在實現過程遇到的若干問題進行了分析仿真,包括通道間幅相不一致,信號加權合并的位置,算法實現的實際方法。通過分析,為實際解決這些工程問題提供理論依據。4.作為發(fā)射端主要的非線性來源,本文重點研究了功率放大器對發(fā)射多波束的影響。首先,建立輸入信號形式和功率放大器模型。接著分析功放輸出信號形式,從分析結果可以發(fā)現,輸出信號可以分成原信號和干擾信號兩種形式,通過兩種信號的功率比可以衡量功放的非線性對波束信號的影響。最后通過仿真發(fā)現在無記憶功放中,功放對信號的影響與信號的形式有關;而在記憶功放中,記憶效應在信號能量弱的時候表現更明顯,非線性在信號能量強時表現更明顯。結論為設計功放提供了理論依據和參考。
[Abstract]:Digital phased array radar is widely used in military and civil fields because of its advantages of multi-mode and multi-target tracking. The full application of these advantages is closely related to multi-beam technology. At present, the receiving multi-beam technology has been quite mature, but the corresponding multi-beam transmission technology still has a lot of research space. Based on the basic principle of array transmission and the background of digital array, the mechanism, possible technical approaches and characteristics of simultaneous multi-beam transmission of digital array are studied in this paper, and some engineering problems encountered in the process of implementation are also discussed. Detailed theoretical analysis and complete simulation results are given, which provide theoretical support for the engineering application of digital array simultaneously transmitting multi-beam. This paper mainly from the following aspects of research work: 1. This paper introduces the development history of digital phased array radar, and analyzes and compares the working principle of traditional phased array (mainly time-division mode). The digital array transmitting multi-beam technology can work simultaneously in multiple ranges of airspace or even in multiple modes of operation. From this comparison, we can find the significance of the digital array transmitting multi-beam. Based on the beamforming algorithm, three kinds of transmit multi-beam algorithms are analyzed and studied: one based on FFT, one based on orthogonal projection, and one based on subarray. According to the analysis of the algorithm and the comparison of simulation, it can be found that the transmit multi-beam algorithm based on orthogonal projection is more suitable for simultaneous transmitting multi-beam formation of digital array. 3. During the implementation of the algorithm, many engineering problems will arise. This paper analyzes and simulates some problems encountered in the implementation process of the transmitting multi-beam system, including the position of the amplitude and phase inconsistency between channels, the position of signal weighted combination, and so on. Algorithm implementation of the actual method. Through the analysis, provides the theoretical basis for the practical solution of these engineering problems. 4. 4. As the main nonlinear source of transmitter, this paper focuses on the influence of power amplifier on transmitting multi-beam. First, the input signal form and the power amplifier model are established. From the analysis results, we can find that the output signal can be divided into two forms: the original signal and the interference signal. Through the power ratio of the two signals, the influence of the nonlinear power amplifier on the beam signal can be measured. Finally, it is found that in memoryless amplifier, the effect of power amplifier on signal is related to the form of signal, while in memory amplifier, the memory effect is more obvious when the signal energy is weak, and the nonlinearity is more obvious when the signal energy is strong. Conclusion it provides theoretical basis and reference for designing power amplifier.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN958.92

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本文編號：2140856