复杂电磁环境模拟中基带信号产生单元的设计与实现

发布时间：2018-03-10 23:19

本文选题：FPGA　切入点：基带信号处理　出处：《电子科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着科学技术的日益进步,越来越多的电子设备使用在人类的生活中和现代化战场上,使空间的电磁环境变得越来越复杂,对人类的生活和战争的胜负起到了重要的作用。只有充分了解所处空间的电磁环境才能更好的利用它,所以对复杂电磁环境的研究对人类的生活、科技和军事的发展是十分重要的。本文主要介绍了复杂电磁环境模拟中基带信号产生单元的设计与实现。应用了任意波模式的基带信号产生技术和复调制技术,以“DSP+FPGA+DDR2+DA板”为硬件平台,实现了单设备能同时产生最多24路频率、幅度、调制方式、码元速率均可调的载波调制信号的基带信号产生单元。本文根据软件无线电的思想提出了复杂电磁环境模拟中基带信号产生单元设计的方案。该方案主要包含多速率基带信号处理与多路载波调制信号的产生两部分内容。多速率基带信号处理总共有以下三个模块:一、DSP与FPGA之间数据通路的建立,实现了DSP与FPGA之间的通信。二、海量高速基带信号数据存取控制器的设计,利用DDR2 SDRAM存储器实现了对基带信号数据的快速存入与读取操作,完成了对模拟的复杂电磁环境中的背景信号可以进行回放的功能。三、多速率基带信号变采样率处理模块,利用CIC插值滤波器提高了基带信号的采样率,有效抑制了基带信号的镜像成分和谐波分量。多路载波调制信号产生模块是本文的另一个重点,运用了复调制技术,将经过多速率基带信号处理模块处理之后的基带信号与频率可控的不同频率的载波信号进行复调制得到多路载波调制信号。将得到的多路载波调制信号上变频到射频并通过信号调理电路便可以对复杂电磁环境中的信号进行模拟。复杂电磁环境模拟中基带信号产生单元的各个功能模块均是利用ISE软件在Xilinx公司的FPGA中进行实现的,有效的节省了系统的开发时间。使用ChipScope在线逻辑分析仪和频谱分析仪测试了每个单元,由最终得到的数据可知本文中复杂电磁环境模拟中基带信号产生单元的设计满足预定的要求。
[Abstract]:With the advances of science and technology, more and more electronic devices used in human life and the modern battlefield, the electromagnetic environment becomes more and more complex, has important effect on human life and the outcome of the war. Only fully understand the space electromagnetic environment in order to better use of it, so on in the complicated electromagnetic environment on human life, the development of science and technology and the military is very important. This paper mainly introduces the design and implementation of baseband signal generation unit in simulation of complex electromagnetic environment. The application of arbitrary wave mode baseband signal generation technology and complex modulation technique to the DSP+FPGA+DDR2+DA board as the hardware platform, realize a single device can simultaneously produce up to 24 frequency, amplitude modulation, baseband signal carrier modulation signal symbol rate can be adjusted for the generating unit according to software. Radio proposed unit design scheme produces baseband signal simulation of complex electromagnetic environment. The scheme mainly includes the multi rate baseband signal processing and multi carrier modulation signal generation part two. Multi rate baseband signal processing a total of the following three modules: first, establish a data path between DSP and FPGA, to achieve communication between DSP and FPGA. Two, the design of massive high-speed baseband signal data access controller, to achieve a rapid deposit of baseband signal and data read operation using the DDR2 SDRAM memory, the background signal simulation of complex electromagnetic environment can playback function. Three, the sampling rate variable rate baseband processing module the signal, using CIC interpolation filter to improve the sampling rate of the baseband signal, can effectively restrain the mirror components of the baseband signal and harmonic components. Multi carrier modulation signal. Module is another focus of this article, the use of complex modulation technology, the multi rate baseband signal processing of baseband signal processing module and frequency controllable after different frequency carrier signal for polyphonic system receive multi carrier modulation signal. The multi carrier modulation signal to a radio frequency signal and can in the complex electromagnetic environment is simulated through the signal conditioning circuit. Each function module of baseband signal generating unit in simulation of complex electromagnetic environment are implemented on FPGA Xilinx, using ISE software, effectively save system development time. Each unit is tested using ChipScope logic analyzer and a spectrum analyzer, design unit by the baseband signal in complex electromagnetic environment simulation data shows that the resulting in meet the predetermined requirements.

【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TP333;TN791

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