【摘要】：數(shù)字相控陣?yán)走_(dá)因其多工作模式,多目標(biāo)跟蹤等優(yōu)點(diǎn),現(xiàn)正廣泛的應(yīng)用于軍事、民用領(lǐng)域,而這些優(yōu)點(diǎn)的充分運(yùn)用是與多波束技術(shù)緊密相關(guān)的。目前,接收多波束技術(shù)已經(jīng)相當(dāng)成熟了,而與之對(duì)應(yīng)的發(fā)射多波束技術(shù)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(chǔ),以數(shù)字陣為研究背景,深入研究了數(shù)字陣列同時(shí)多波束發(fā)射的機(jī)理、可能的技術(shù)途徑和特點(diǎn)、以及實(shí)現(xiàn)過(guò)程中遇到的一些工程問(wèn)題,給出了詳細(xì)的理論分析和完整的仿真結(jié)果,為數(shù)字陣列同時(shí)發(fā)射多波束的工程應(yīng)用提供理論支撐。本文主要從下面幾個(gè)方面展開(kāi)研究工作:1.介紹數(shù)字相控陣?yán)走_(dá)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(shí)分模式),對(duì)于多目標(biāo)同時(shí)工作存在著不足;而采用了數(shù)字陣發(fā)射多波束技術(shù)則可以在空域多個(gè)范圍內(nèi)同時(shí)工作,甚至可以多種工作模式同時(shí)工作。從這個(gè)對(duì)比中可以發(fā)現(xiàn)數(shù)字陣發(fā)射多波束的研究意義。2.以波束形成算法為基礎(chǔ),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(jù)算法的分析和仿真的對(duì)比可以發(fā)現(xiàn),基于正交投影的發(fā)射多波束算法更適合于數(shù)字陣的同時(shí)發(fā)射多波束形成。3.在算法實(shí)現(xiàn)的過(guò)程中,會(huì)產(chǎn)生很多工程問(wèn)題,本文就發(fā)射多波束系統(tǒng)在實(shí)現(xiàn)過(guò)程遇到的若干問(wèn)題進(jìn)行了分析仿真,包括通道間幅相不一致,信號(hào)加權(quán)合并的位置,算法實(shí)現(xiàn)的實(shí)際方法。通過(guò)分析,為實(shí)際解決這些工程問(wèn)題提供理論依據(jù)。4.作為發(fā)射端主要的非線性來(lái)源,本文重點(diǎn)研究了功率放大器對(duì)發(fā)射多波束的影響。首先,建立輸入信號(hào)形式和功率放大器模型。接著分析功放輸出信號(hào)形式,從分析結(jié)果可以發(fā)現(xiàn),輸出信號(hào)可以分成原信號(hào)和干擾信號(hào)兩種形式,通過(guò)兩種信號(hào)的功率比可以衡量功放的非線性對(duì)波束信號(hào)的影響。最后通過(guò)仿真發(fā)現(xiàn)在無(wú)記憶功放中,功放對(duì)信號(hào)的影響與信號(hào)的形式有關(guān);而在記憶功放中,記憶效應(yīng)在信號(hào)能量弱的時(shí)候表現(xiàn)更明顯,非線性在信號(hào)能量強(qiáng)時(shí)表現(xiàn)更明顯。結(jié)論為設(shè)計(jì)功放提供了理論依據(jù)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(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN958.92

【參考文獻(xiàn)】

相關(guān)期刊論文 前2條

1 張光義,華海根,邵潤(rùn)朋;相控陣接收多波束的數(shù)字形成方法及計(jì)算機(jī)模擬實(shí)驗(yàn)[J];電子學(xué)報(bào);1982年04期

2 南敬昌;高明明;劉元安;唐碧華;;非線性射頻功率放大器行為模型的分析與比較[J];微波學(xué)報(bào);2008年S1期

相關(guān)博士學(xué)位論文 前1條

1 胡嘯;基于二階及高階統(tǒng)計(jì)量的數(shù)字接收機(jī)非線性盲辨識(shí)技術(shù)[D];華中科技大學(xué);2011年

相關(guān)碩士學(xué)位論文 前1條

1 王青;基于FPGA的發(fā)射數(shù)字多波束形成算法研究及工程實(shí)現(xiàn)[D];西安電子科技大學(xué);2011年

，

本文編號(hào)：2140856