宽带双通道波形产生器的研究
发布时间：2018-08-02 15:12
【摘要】：在现代电子战环境中,雷达面临着许多的威胁,需要具备抗干扰和强生存能力,因而要求雷达波形产生器具备产生高稳定、宽频带、快速跳变以及任意形式波形输出的能力,并且在有些场合,需要产生双通道甚至多通道的输出信号,且要求这些输出信号参数可调以及具有通道一致性。而随着现代数字技术的迅速发展,直接数字合成(DDS)技术得到了广泛的应用,数字方式产生的波形有着严格相干性、高稳定性、高频率分辨率以及可编程等优点。因此研究基于数字技术的宽带双通道波形产生器具有重要的意义。本文在深入研究了DDS的工作原理以及中频线性调频信号的产生方法的基础上,设计了基于DDWS结构的数字基带+数字正交调制的多路并行的波形产生方案,并且根据此方案完成了宽带双通道波形产生器的波形产生部分的FPGA实现,最后对输出信号波形进行了系统级仿真。本文的主要工作包括:(1)介绍了雷达信号处理的一些基本理论知识,包括信号检测理论、匹配滤波理论和脉冲压缩理论。(2)分析了DDS的工作原理,介绍了基于DDWS结构的中频线性调频信号的产生方法。(3)分析了内插滤波的多相结构设计和数控振荡器(NCO)的控制方法,提出了基于DDWS结构的数字基带+数字正交调制的多路并行的波形产生方案。(4)依据波形产生方案完成了宽带双通道波形产生器的FPGA实现,对FPGA内部的关键模块进行了分析与设计,并完成了系统级仿真。
[Abstract]:In the environment of modern electronic warfare, radar faces many threats, and needs to have anti-jamming and strong survivability. Therefore, radar waveform generator is required to have the ability to produce high stability, wide band, fast jump and output of any form of waveform. In some cases, it is necessary to produce two-channel or even multi-channel output signals, and the parameters of the output signals are required to be adjustable and have channel consistency. With the rapid development of modern digital technology, direct digital synthesis (DDS) technology has been widely used. The waveform generated by digital mode has the advantages of strict coherence, high stability, high frequency resolution and programmable. Therefore, it is of great significance to study the wideband dual-channel waveform generator based on digital technology. On the basis of deeply studying the working principle of DDS and the generation method of if LFM signal, this paper designs a multi-channel parallel waveform generation scheme of digital baseband digital quadrature modulation based on DDWS structure. According to this scheme, the FPGA implementation of the waveform generation part of the broadband dual-channel waveform generator is completed. Finally, the output signal waveform is simulated at the system level. The main work of this paper is as follows: (1) some basic theories of radar signal processing are introduced, including signal detection theory, matched filtering theory and pulse compression theory. (2) the working principle of DDS is analyzed. The generation method of if LFM signal based on DDWS structure is introduced. (3) the design of polyphase structure of interpolation filter and the control method of NC oscillator (NCO) are analyzed. A multi-channel parallel waveform generation scheme of digital baseband digital quadrature modulation based on DDWS structure is proposed. (4) based on the waveform generation scheme, the FPGA implementation of wideband dual-channel waveform generator is completed, and the key modules in FPGA are analyzed and designed. System level simulation is completed.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN741
本文编号：2159836
[Abstract]:In the environment of modern electronic warfare, radar faces many threats, and needs to have anti-jamming and strong survivability. Therefore, radar waveform generator is required to have the ability to produce high stability, wide band, fast jump and output of any form of waveform. In some cases, it is necessary to produce two-channel or even multi-channel output signals, and the parameters of the output signals are required to be adjustable and have channel consistency. With the rapid development of modern digital technology, direct digital synthesis (DDS) technology has been widely used. The waveform generated by digital mode has the advantages of strict coherence, high stability, high frequency resolution and programmable. Therefore, it is of great significance to study the wideband dual-channel waveform generator based on digital technology. On the basis of deeply studying the working principle of DDS and the generation method of if LFM signal, this paper designs a multi-channel parallel waveform generation scheme of digital baseband digital quadrature modulation based on DDWS structure. According to this scheme, the FPGA implementation of the waveform generation part of the broadband dual-channel waveform generator is completed. Finally, the output signal waveform is simulated at the system level. The main work of this paper is as follows: (1) some basic theories of radar signal processing are introduced, including signal detection theory, matched filtering theory and pulse compression theory. (2) the working principle of DDS is analyzed. The generation method of if LFM signal based on DDWS structure is introduced. (3) the design of polyphase structure of interpolation filter and the control method of NC oscillator (NCO) are analyzed. A multi-channel parallel waveform generation scheme of digital baseband digital quadrature modulation based on DDWS structure is proposed. (4) based on the waveform generation scheme, the FPGA implementation of wideband dual-channel waveform generator is completed, and the key modules in FPGA are analyzed and designed. System level simulation is completed.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN741
【参考文献】
相关期刊论文 前1条
1 李衍忠,蔡英杰,姒强,向敬成;DDS谱质分析及其杂散抑制研究综述[J];现代雷达;2000年04期
，本文编号：2159836
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