通信综测仪谱分析与控制模块设计

发布时间：2018-05-11 03:17

本文选题：群延迟校正 + 实时频谱分析　；参考：《电子科技大学》2016年硕士论文

【摘要】：通信综合测试仪是无线通信设备在开发、生产、测试和维护过程中必不可少的测试仪器,以软件无线电技术为基础,其核心功能之一是信号的频谱分析。随着宽带通信技术的快速发展以及跳频、扩频技术的广泛使用,通信综合测试仪频谱分析面临着高带宽、窄信号、多突发等测试挑战。论文针对通信综合测试仪的宽带频域测试需求,设计了一种基于软件无线电理论的宽带频谱处理模块。模块采用全数字中频处理方法,将“触发—捕获—存储—分析”结构作为设计的整体架构,实现宽带信号的实时频谱分析功能。论文首先介绍了传统频谱分析与实时频谱分析方法的架构特点,并根据测试需求,设计了用于宽带信号频谱测试的硬件逻辑方案;关于模拟通道带通滤波器的群延迟校正,论文从数字全通滤波器的系数特征出发,利用最小相位序列与其复倒谱系数之间的关系,由期望全通滤波器的群延迟函数得到全通滤波器的传递函数,完成校正滤波器的设计;针对不同测试信号的特点,设计了包括频率模板触发的四种触发功能,实现不同条件下的触发捕获功能;设计了基于DDR3 SDRAM存储芯片的触发存储机制,配合触发功能模块,将触发时刻附近的时域信号经正交解调降速得到基带I/Q信号后不间断的存入SDRAM中;对于实时频谱分析中的关键技术——重叠帧,论文设计了工作于不同模式下的两种重叠算法,包括dual_FIFO和SDRAM地址重叠。重叠后的数据以数据帧的格式与时域窗口函数相乘,数据经加窗处理后送入到频谱分析功能块完成宽带信号的频谱分析处理;最后,设计了命令解析仲裁中心,完成上位机命令解析工作,并产生本地控制信号,控制相应模块的功能调整,实现用户对模块的整体控制。通过模块与宽带信号源和相关测试软件的联合调试,合理设计测试信号对论文所设计的各功能模块依次进行测试,并与理论值进行对比分析,验证了论文给出的各模块功能,实现了宽带频谱分析功能。
[Abstract]:The communication comprehensive testing instrument is an indispensable test instrument in the development, production, testing and maintenance of wireless communication equipment. It is based on the software radio technology. One of its core functions is signal spectrum analysis. With the rapid development of broadband communication technology and the wide use of frequency hopping and spread spectrum technology, the spectrum analysis of communication integrated tester is faced with high bandwidth, narrow signal, multi-burst and other testing challenges. In this paper, a broadband spectrum processing module based on software radio theory is designed to meet the requirement of broadband frequency domain testing of communication integrated tester. In the module, the full-digital if processing method is adopted, and the "triked-capture-storage-analysis" structure is taken as the whole structure of the design to realize the real-time spectrum analysis function of wideband signal. Firstly, the paper introduces the architecture characteristics of traditional spectrum analysis and real-time spectrum analysis methods, and designs the hardware logic scheme for broadband signal spectrum testing according to the test requirements, and the group delay correction of analog channel bandpass filter. Based on the coefficient characteristics of digital all-pass filter and the relationship between the minimum phase sequence and its complex cepstrum coefficient, the transfer function of the all-pass filter is obtained from the group delay function of the expected all-pass filter, and the design of the correction filter is completed. According to the characteristics of different test signals, four trigger functions including frequency template trigger are designed to realize the trigger capture function under different conditions, and the trigger storage mechanism based on DDR3 SDRAM memory chip is designed to cooperate with the trigger function module. The time domain signal near the trigger time is saved into SDRAM by quadrature demodulation and deceleration. For the key technology of real-time spectrum analysis, overlapping frame, two overlapping algorithms working in different modes are designed in this paper. Including dual_FIFO and SDRAM address overlap. The overlapped data is multiplied by the time domain window function in the format of the data frame, and the data is sent to the spectrum analysis function block to complete the spectrum analysis of the wideband signal after windowing. Finally, the command analysis arbitration center is designed. The command analysis of the upper computer is completed, and the local control signal is generated, the function adjustment of the corresponding module is controlled, and the overall control of the module is realized. Through the joint debugging of the module with the wideband signal source and the related test software, the test signal is designed to test the functional modules designed in turn, and compared with the theoretical values, the functions of each module are verified. The function of broadband spectrum analysis is realized.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN806

【参考文献】