调制域分析仪关键技术

【作者】 孙婷；

【导师】 刘镰斧；

【作者基本信息】 电子科技大学 ， 通信与信息系统， 2008， 硕士

【摘要】 调制域是由信号的时间和频率构成的平面域,它反应信号的频率与时间的关系,可得出时间——频率曲线图,为人们提供了一个新的分析信号的方法。在此基础上发展起来的调制域分析技术作为一种新的复杂信号分析技术,已使用于众多领域,如在电子对抗、雷达等方面。应用该技术研制出来的调制域分析仪,深入的分析了频率等动态特性,提供了一种直观的测试和分析复杂信号的方法,是电子领域的重要仪器。本次课题主要研制调制域分析仪的关键部分——瞬时测频组件。该组件可分为四部分:信号接口,FPGA-计数器,MCU(主控单元),虚拟终端(即软面板)。本论文主要阐述了调制域分析仪关键部分——瞬时测频组件中,虚拟终端系统软件构成和算法,包括三大功能模块:测试模块,数据处理模块和图形显示模块,详细介绍了它们的功能设计,并对所得数据进行了分析。本文详细介绍了软件系统中使用的主要方法,在测试模块中将数据来源设计为从“文档读取”和从“并口读取”两种方式。在数据处理模块中,针对三种误差类型分别提出了解决和处理方法。在对粗大误差的处理中,除了使用常用的方法——莱特准则,还提出了一个改进方法,能够弥补莱特准则的一些缺点。在对随机误差的处理中,使用了中值滤波。在对系统误差的处理中,使用了阿卑-赫梅特判别准则和马可利夫判别准则来辅助判断。考虑到数据处理的复杂性以及需配合硬件调试,将误差处理的方法均设置成可选的方式。在图形显示模块中,主要使用了矩阵的思想,将多种图形算法用矩阵函数来实现,通过矩阵函数的调用,能简化程序,并规范程序结构,还能为更复杂的图形变化提供接口。文中首先介绍了调制域分析技术的概念和应用,接着阐述了瞬时测频组件的硬件方面相关测量原理和关键技术,然后重点阐述了软件的开发环境,软件系统的三大构成部分及各部分详细算法和功能,并列举了多个实例,对结果进行了分析,最后对不足和待改进之处进行了总结。更多还原

【Abstract】 Modulation domain is a plane domain composed of time and frequency of signal. It reflects the relationship between time and frequency, then time-frequency graph can be imported from Modulation domain. Modulation domain provides a new method for signal analysis. As a new and complex signal analysis technology, modulation domain analysis has already been applied to many fields such as electronic countermeasures and radar. Modulation Domain Analyzer (MDA), which is developed from this technology, can deeply analyze dynamic characters e.g. frequency, and provides us an intuitive method for complex signal testing and analysis. Therefore, MDA can be considered as an important device in electronics field.This program focuses on the key part of MDA -- Module of Instantaneous Testing Frequency, which includes four parts: Signal Interface, FPGA-Counter, Main Control Unit (MCU), Visual Terminal (Soft Panel). This paper mainly introduces the structure and related algorithm of Soft Panel, which includes three modules--Testing Module, Data Processing Module and Graph Display Module, also introduces their functions design and data analysis in detail.This paper introduces the main analysis methods in this system. In Testing Module, data input is categorized to file input and parallel ports input. In Data Processing Module, different solutions are presented separately according to three error types. A new method is presented to improve Wright——theorem in distinct error processing method. Mid-value filter is imported in random error processing. For system error processing, Two theorems are used as a subsidiary method. Considering the complexity of data processing as well as to cooperate with hardware debugging, error processing methods are all designed to be optional. The idea of matrix is imported in Graph Display Module, so multiple graph algorithms are implemented by matrix functions, thus the codes have been simplified and the system architecture is more standard, what’s more, it is easier to provide interfaces for more complicated dynamic graph.The paper first introduces the concept and application of Modulation Domain Analysis. Secondly, the related measuring principle and key technique of the hardware of Instantaneous Testing Frequency component. Thirdly, it expatiates the system software development environment, the three key function modules and related algorithm. At last, several actual examples are presented.更多还原