基于嵌入式SOC手持式频谱仪的硬件设计与实现

发布时间：2018-05-29 18:31

  本文选题：频谱分析仪 + AXI　； 参考：《电子科技大学》2015年硕士论文

【摘要】：频谱分析是对信号进行频域分析的重要手段,要求仪器同时具有时频转换、频谱分析和信号处理的能力。现代无线通信测试不仅要求测试设备具有实时频谱测量的能力,还需要具备高动态范围,良好的EVM和高SNR。为了适应现代信息化战争以及电子设备便携化的趋势,通信测量仪器在不仅相比于以前要求更高的性能指标,在集成度方面也提出了更高的要求。现代战争中需要工程兵种能够使用高度集成化的手持式无线通信测量设备对战场进行特定的频段的无线电磁检测;在民用方面,通信运营商和无线电监测部门对室内与室外的电磁环境进行监测,工程人员需要一种轻便的高性能的设备进行无线信号测量。本文针对以上问题,首先介绍了国内外的手持式频谱仪的发展动态,分析了常规的超外差通信接收机结构和高集成度的零中频通信接收机架构以及片上系统ZYNQ系列可扩展处理器。文中研究了ZYNQ系列器件的资源、AXI4总线结构以及其高效率的开发流程,还介绍了基于零中频(ZIF)结构的捷变通信收发芯片AD9361的各种特点,该芯片将滤波,低噪声放大,混频,本振,基带数据通信等一系列电路全部集成在了单个芯片上。基于以上研究提出了基于捷变收发芯片AD9361和全面可编程片上系统芯片xc7z020可编程无线通信收发机系统方案。设计了基于ZYNQ片上系统和AD9361的手持式频谱仪的射频测量单板电路,将射频接收、基带处理和人机界面全部集成在了单个电路板上。在ZYNQ的可编程逻辑部分设计并实现了双速率LVDS信号的接收和I/Q信号拼接,直流失调跟踪与补偿以及I/Q失调的校准。使用xilinx提供的开发环境和桥接IP核进行基于AXI总线的DMA传输的开发,实现了SOC片内可编程逻辑和片内ARM核的高速数据交互。经软件和硬件联合调试后,使得频谱仪达到射频芯片所能达到的性能指标,频谱测量范围达到70MHz~6GHz,实时测量带宽达到50MHz。本论文所论述的极高集成度频谱分析仪以及基带信号接收和前级处理单元均能够正常运行工作,基本达到了预定的指标和工程技术要求,在各个测试和实验的场合中工作稳定,使得该手持式频谱仪可运用于常见的通信测试场合。
[Abstract]:Spectrum analysis is an important means to analyze signals in frequency domain, which requires the ability of time-frequency conversion, spectrum analysis and signal processing. Modern wireless communication testing requires not only the capability of real-time spectrum measurement, but also the capability of high dynamic range, good EVM and high SNR. In order to adapt to the trend of modern information war and portable electronic equipment, communication measuring instruments not only require higher performance than before, but also put forward higher requirements in integration. In modern warfare, engineers are required to be able to use highly integrated hand-held wireless communication measurement equipment to carry out wireless electromagnetic detection in a specific frequency band on the battlefield. Communication operators and radio monitoring departments monitor the electromagnetic environment both indoors and outdoors. Engineers need a portable high performance device for wireless signal measurement. Aiming at the above problems, this paper first introduces the development trends of hand-held spectrometers both at home and abroad. The structure of conventional superheterodyne receiver, the architecture of highly integrated zero-if communication receiver and the ZYNQ series extensible processors of on-chip system are analyzed. In this paper, the resource AXI4 bus structure of ZYNQ series devices and its high efficiency development flow are studied. The characteristics of AD9361 based on ZIF structure are also introduced, which filter, low noise amplification, mixing frequency, local oscillator, etc. A series of circuits such as baseband data communication are integrated on a single chip. Based on the above research, this paper presents a system scheme based on agile transceiver chip (AD9361) and total programmable on-chip system chip (xc7z020) for programmable wireless communication transceiver. The RF measurement circuit of hand-held spectrometer based on ZYNQ and AD9361 is designed. The RF receiver, baseband processing and man-machine interface are all integrated on a single circuit board. In the programmable logic part of ZYNQ, the dual rate LVDS signal receiving and I / Q signal splicing, DC offset tracking and compensation, and I / Q offset calibration are designed and implemented. The DMA transmission based on AXI bus is developed by using the development environment provided by xilinx and the bridging IP core. The high speed data exchange between SOC on-chip programmable logic and on-chip ARM core is realized. After the joint debugging of software and hardware, the spectrometer can achieve the performance index of RF chip. The spectrum measurement range is 70 MHz, and the bandwidth of real-time measurement is 50 MHz. The highly integrated spectrum analyzer, baseband signal receiving and pre-processing unit discussed in this paper can work normally, and basically reach the predetermined targets and engineering technical requirements, and work stably in various testing and experimental situations. So that the hand-held spectrometer can be used in common communication test occasions.
【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】：TM935.21
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本文编号：1951948