【摘要】：由于現(xiàn)代軍事技術(shù)的發(fā)展對雷達要求的日益提高,以及雷達所面臨的挑戰(zhàn)日益嚴峻,寬帶雷達技術(shù)的發(fā)展將成為一個重要的發(fā)展方向,它的重要組成部分寬帶波形產(chǎn)生便成為一個必不可少的研究內(nèi)容。信號要求具有大的時寬積、高穩(wěn)定性以及任意形狀等�；贒DS的現(xiàn)代波形產(chǎn)生技術(shù)具有高的頻率和相位分辨率、高穩(wěn)定性、可編程輸出等特點,適應現(xiàn)代雷達波形產(chǎn)生的需求。本文研究了兩種基于內(nèi)插的寬帶信號數(shù)字產(chǎn)生技術(shù),包括基帶內(nèi)插加數(shù)字正交調(diào)制的方法和直接低中頻內(nèi)插加帶通濾波的方法,并通過具體設計實例對兩種方法做了仿真和對比,針對第一種方法做了FPGA仿真實現(xiàn)。本文主要工作如下:1.針對寬帶高中頻的應用要求,對傳統(tǒng)基帶內(nèi)插+正交調(diào)制的數(shù)字波形產(chǎn)生方案提出了改進,得出基于多相原理的并行正交調(diào)制結(jié)構(gòu),并利用系數(shù)對稱性對多相濾波器實現(xiàn)優(yōu)化。2.根據(jù)某具體應用實例,采用改進后的基帶內(nèi)插+正交調(diào)制結(jié)構(gòu)完成了FPGA總體設計,并對各個功能模塊進行了仿真。3.提出了一種基于低中頻信號內(nèi)插+帶通濾波實現(xiàn)高中頻信號的數(shù)字波形產(chǎn)生方案,分析并推導了低中頻信號參數(shù)設計應滿足的條件,提出了該方法的多相濾波高效結(jié)構(gòu),并進行了理論仿真。4.將兩種寬帶高中頻數(shù)字波形產(chǎn)生方案進行了對比,分析了各自的適應條件。
[Abstract]:The development of broadband radar technology will become an important development direction due to the development of modern military technology and the increasing demand for radar and the increasingly serious challenges facing radar. The generation of wideband waveform, an important part of it, has become an essential research content. The signal must have large time width product, high stability and arbitrary shape. The modern waveform generation technology based on DDS has the characteristics of high frequency and phase resolution, high stability, programmable output and so on, which can meet the needs of modern radar waveform generation. In this paper, two kinds of wideband signal digital generation techniques based on interpolation are studied, including baseband interpolation digital quadrature modulation and direct low intermediate frequency interpolation with bandpass filtering. The two methods are simulated and compared by a concrete design example, and the FPGA simulation is implemented for the first method. The main work of this paper is as follows: 1. In order to meet the requirements of wideband and high frequency applications, the digital waveform generation scheme of traditional baseband interpolation quadrature modulation is improved, and the parallel quadrature modulation structure based on polyphase principle is obtained. The coefficient symmetry is used to optimize the polyphase filter. 2. According to a specific application example, the improved baseband interpolation quadrature modulation structure is used to complete the overall design of FPGA, and each functional module is simulated. This paper presents a digital waveform generation scheme based on low intermediate frequency signal interpolation bandpass filter, analyzes and deduces the conditions that should be satisfied in the parameter design of low intermediate frequency signal, and puts forward an efficient structure of polyphase filter for this method. And the theoretical simulation. 4. Two kinds of broadband and high frequency digital waveform generation schemes are compared and their adaptive conditions are analyzed.
【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】：TN957.51

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本文編號：2304119