【摘要】：相控陣雷達問世以來,突出的優(yōu)越性使它獲得了快速的發(fā)展。相控陣雷達能夠形成同時多波束實現(xiàn)快速掃描探測空域并且還可以根據(jù)實際環(huán)境靈活的控制波束形狀,這些特點使其不僅在雷達領域,同時也在通信、航空導航領域快速的得到應用并不斷取得進展�，F(xiàn)今,相控陣雷達多波束形成技術特別是數(shù)字多波束形成技術(DBF)已越來越多的得到國內外研究機構和學者的重視并進行研究。為了了解相控陣雷達多波束技術的現(xiàn)狀以及形成方式、實際工程實現(xiàn)中遇到的難題,本文主要做了以下工作:1.詳細的介紹相控陣雷達的產(chǎn)生背景、發(fā)展歷史及現(xiàn)狀,并闡述了相控陣雷達形成多個發(fā)射/接收波束的意義。2.分別介紹了相控陣雷達傳統(tǒng)多波束形成方式以及數(shù)字多波束形成方式。傳統(tǒng)多波束形成方式主要有兩種,射頻多波束形成和中頻多波束形成。接著,本文從數(shù)字多波束的基本原理出發(fā),研究了雷達線性陣列模型及其基礎上的多波束方向圖函數(shù)。最后介紹了多波束在實際中的應用。3.在DBF基本原理的基礎上,并兼顧發(fā)射/接收多波束形成技術,本文詳細分析了以下幾種DBF算法:FFT多波束形成算法,分子陣級別的的多波束形成算法,自適應多波束算法。最后,結合理論推導和Matlab仿真,本文詳細對比分析了三種算法各自特點以及優(yōu)劣之處。4.作為引起雷達系統(tǒng)非線性.失真的一個很重要的因素,本文在最后章節(jié)研究了射頻功放對多波束形成的影響�；诠β史糯笃鞯湫蛿�(shù)學模型,本文先推導了功放輸入輸出信號的數(shù)學關系式,然后分別討論了功放在輸入恒包絡和非恒包絡載波時功放的期望信號和干擾分量。通過Matlab仿真,分別分析了功放在恒包絡和非恒包絡輸入信號的情況下對多波束形成造成的影響,因此,分析結果可以作為選用功放的一個指導。
[Abstract]:Since the advent of phased array radar (phased array radar), it has achieved rapid development due to its outstanding advantages. Phased array radar (phased array radar) is capable of forming simultaneous multi-beam to realize fast scanning in detecting airspace, and it can also control beam shape flexibly according to the actual environment. These characteristics make it not only in radar field, but also in communication. The field of aeronautical navigation has been applied rapidly and has made great progress. Nowadays, phased array radar multi-beam forming technology, especially digital multi-beam forming technology (DBF), has been paid more and more attention and studied by domestic and foreign research institutions and scholars. In order to understand the present situation and forming mode of phased array radar multi-beam technology and the difficult problems encountered in practical engineering implementation, the main work of this paper is as follows: 1. The background, development history and present situation of phased array radar are introduced in detail, and the significance of forming multiple transmit / receive beams by phased array radar is expounded. The traditional multi-beam forming and digital multi-beam forming of phased array radar are introduced respectively. There are two kinds of traditional multi-beam forming methods, radio frequency multi-beam forming and intermediate frequency multi-beam forming. Then, based on the basic principle of digital multi-beam, the linear array model of radar and its multi-beam pattern function are studied in this paper. Finally, the application of multi-beam in practice is introduced. 3. Based on the basic principle of DBF and taking into account the transmit / receive multi-beam forming technology, this paper analyzes the following DBF algorithms in detail: FFT multi-beam forming algorithm, multi-beam forming algorithm at molecular array level, and adaptive multi-beam algorithm. Finally, combined with theoretical derivation and Matlab simulation, this paper compares and analyzes the characteristics and advantages and disadvantages of the three algorithms in detail. 4. As the cause of radar system nonlinearity. As an important factor of distortion, the influence of RF power amplifier on multi-beam forming is studied in the last chapter of this paper. Based on the typical mathematical model of the power amplifier, this paper first deduces the mathematical relation of the input and output signals of the amplifier, and then discusses the expected signal and the interference component of the amplifier when the input constant envelope carrier and the non-constant envelope carrier are respectively discussed. Through Matlab simulation, the influence of power amplifier on multi-beam forming under constant envelope and non-constant envelope input signal is analyzed respectively. Therefore, the analysis result can be used as a guide for selecting 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】：2015
【分類號】：TN958.92

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本文編號：2471920