1.5GHz频谱分析仪中频与显控模块硬件设计

发布时间：2018-06-30 09:50

本文选题：频谱分析 + 数字中频　；参考：《电子科技大学》2014年硕士论文

【摘要】：在现代电子测量仪器中,频谱分析仪被广泛应用于电子通信、科研生产、航空航天、应用教学等诸多领域。随着数字处理技术与嵌入式应用的快速发展,频谱分析仪也在朝着数字化、小型化、智能化发展。论文设计了一种基于ARM+FPGA+DSP结构的1.5GHz频谱分析仪中频硬件平台,包括由FPGA和DSP组成的数字中频处理模块设计、以ARM为主控处理器的嵌入式显控模块设计。数字中频处理模块设计主要由信号调理及采样通道设计、数字中频电路设计、数字中频接口逻辑电路设计以及板级电源设计组成。板级电源为中频硬件平台提供稳定高效的电源电路;由射频输出的固定中频信号需要经过增益放大、抗混叠滤波等信号调理后,量化为数字中频信号;逻辑处理单元FPGA和协处理器DSP通过数据接口逻辑电路协同工作,共同完成被测信号的频谱/解调信息获取、整机的命令解析;最后,逻辑处理单元FPGA通过频谱数据及命令接口逻辑电路,实现中频模块与显控模块之间的数据及命令通信。显控模块设计主要包括频谱数据及命令缓冲驱动设计、频谱分析仪显示单元电路设计以及多种仪器外设接口电路设计。显控模块嵌入式平台采用了Win CE操作系统,该操作系统下的应用程序通过频谱数据及命令接口驱动的设计,实现对中频模块的数据及命令的读写访问。仪器测量信息的实时显示采用了标准显示与扩展显示接口两种显示方式,其中标准显示为LCD液晶屏显示,扩展显示则通过显示刷新缓存电路的设计,实现了VGA显示接口。除此之外,显控模块还实现了频谱分析仪的全部仪器接口,包括网口、串行接口、USB接口等等。论文通过对频谱分析仪中频模块的两个功能模块硬件电路设计测试和整机性能测试,验证了本课题论文设计方案的正确性,论文设计的硬件电路性能指标达到了设计预期。
[Abstract]:In modern electronic measuring instruments, spectrum analyzer is widely used in many fields, such as electronic communication, scientific research and production, aerospace, application teaching and so on. With the rapid development of digital processing technology and embedded application, spectrum analyzer is developing towards digitalization, miniaturization and intelligence. In this paper, a 1.5 GHz spectrum analyzer hardware platform based on arm FPGA DSP architecture is designed, including the design of digital if processing module composed of FPGA and DSP, and the design of embedded display and control module with arm as the main processor. The design of digital intermediate frequency processing module is mainly composed of signal conditioning and sampling channel design, digital if circuit design, digital intermediate frequency interface logic circuit design and board level power supply design. The board power supply provides a stable and efficient power supply circuit for the if hardware platform, and the fixed intermediate frequency signal output by RF needs to be processed by gain amplification, anti-aliasing filtering and other signals, and then quantized to digital if signal. The logic processing unit FPGA and the coprocessor DSP work together through the data interface logic circuit to obtain the spectrum / demodulation information of the signal under test and analyze the command of the whole machine. Logic processing unit FPGA realizes data and command communication between if module and display module through spectrum data and command interface logic circuit. The design of display and control module mainly includes the design of spectrum data and command buffer drive, the circuit design of display unit of spectrum analyzer and the design of interface circuit of various instruments. The embedded platform of display and control module adopts WinCE operating system. The application program in this operating system can read and write the data and commands of if module through the design of spectrum data and command interface driver. The real-time display of instrument measurement information adopts two kinds of display modes: standard display and extended display interface. The standard display is LCD LCD display, and the extended display realizes VGA display interface through the design of display refresh buffer circuit. In addition, the display and control module also realizes all the instrument interfaces of spectrum analyzer, including network port, serial interface and USB interface. This paper verifies the correctness of the design scheme of this thesis by testing the hardware circuit design of two functional modules of the if module of the spectrum analyzer and the performance test of the whole machine. The performance index of the hardware circuit designed in this paper has reached the design expectation.
【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】：TM935.21

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