【作者】 吴银成；

【导师】 蒙建波；

【作者基本信息】 重庆大学 ， 检测技术与自动化装置， 2003， 硕士

【摘要】 本文以某测通公司研究生产的“红九”系统中遥测仿真组合子系统为背景，对其中的数字中频调制器的研究开发进行探讨，主要任务是研究如何用直接数字合成技术进行高速数字中频调制器的设计与实现、并提出了研发过程中所出现的问题的解决方案。首先，对遥测遥控系统的基本概念作了介绍；在此基础上，对遥测遥控系统共有部分——信息传输部分进行了讨论；对研发遥测仿真组合系统的中频调制器所用到的角度调制作了介绍，它也是无线遥测遥控系统信息传输的一个重要组成部分；对遥测遥控系统的组成及其功用作了一定的概述。其次，介绍了频率合成技术。讨论了直接式频率技术、锁相式频率合成技术、数字式频率合成技术、直接数字频率合成技术等几种基本频率合成技术，给出的衡量频率合成技术的各种性能指标，并对全数字频率合成技术作了较详细的讨论。其次，对遥测仿真组合子系统中的数字中频调制器的设计作了分析。给出了系统设计的过程与整个遥测仿真子系统的系统框图。在分析了中频调制器所要求的性能指标的基础上，对数字中频调制器进行了工程设计分析，包括AGC电路设计、DDS方案选择等。再次，对遥测仿真组合子系统中的数字中频调制器的实现进行讨论。先对DDS器件AD9854进行了介绍，在此基础上，讨论数字中频调制器的硬件实现与软件实现过程，如AGC电路、数字倍频电路、DDS电路等电路的实现过程和调制状态流程。然后，对遥测仿真组合子系统中的数字中频调制器的实现过程中所出现的问题作了分析及给出了其解决方案。最后，对本文的工作进行了总结讨论，并提出了作者在这方面的工作需要提高的部分问题。更多还原

【Abstract】 This Dissertation use rebuild of Combined Telemeter System, which is the Subsystem of the RED-NINE system developed by the Aerospace Measure and Telecommunication Incorporated Company, as background, study and discuss Frequency Synthesize Technology. The mostly task is to study how to use the Direct Digital Synthesis technology to design and realize the high speed digital mid-frequency modulator, and give the answers of the problems which emerge in the development.Firstly, introduce the basic conception of the telemeter and the telecontrol system; discuss the common department of the telemeter and the telecontrol system, and the angle modulation used by it; summarize the structure and function of the telemeter and telecontrol.Secondly, introduce the frequency synthesis technology. It discusses some kinds of basic frequency synthesis technology such as direct, phase-lock, digital and direct digital frequency synthesis, then give the performance index of the frequency synthesis, and discusses the digital frequency synthesis technology in detail.Thirdly, give the way to how to design the digital mid-frequency modulator, discuss the design process of the system, and give the block diagram of it. It analyze the performance index of the mid-frequency modulator firstly, abased this, analyze the design of it, which include the AGC circuit、DDS circuit、and so on.Fourthly, discuss how to realize the digital mid-frequency modulator. At the start, introduce the AD9854, which is a DDS chirp, and then, discuss the realization process of the hardware and software of the system, such as realization of the AGC circuit, DDS circuit, state flow, and so on.Afterward, analyze the problems emerged in the debugging, and then to get out the way to disposal them.Finally, summarize this text, then put forward something that author ought to enhance.更多还原