基于GX3011的直播卫星户户通机顶盒硬件电路设计与实现

发布时间：2018-05-17 05:38

本文选题：直播卫星户户通机顶盒 + GX3011芯片　；参考：《山东大学》2016年硕士论文

【摘要】：为使偏远地区的群众能免费收看电视和收听广播,国家推出直播卫星服务,利用中国自主发射的中星九号卫星进行电视节目和服务直播,同时利用地面接收设备进行信号接收。直播卫星户户通机顶盒是直播卫星系统的地面接收设备,主要用于接收直播卫星下发的信号,将信号进行转换和处理后,输出音视频信号到显示设备,便于用户收看。本文主要研究直播卫星户户通机顶盒相关标准、硬件原理、设计要点,完成基于GX3011的直播卫星户户通机顶盒硬件电路的设计与实现,并给出户户通机顶盒设计过程中常见问题的解决方法。论文的主要工作包括：1)在简要介绍直播卫星相关标准的基础上,对以国芯GX3011为主解码芯片的户户通机顶盒的工作原理进行深入研究,分析系统器件需求,选择系统主要器件,包括GPRS模块、Flash模块、DDR模块、复位芯片、音视频芯片等,并给出户户通机顶盒的硬件电路结构和功能。2)在以上基础上,论文对机顶盒硬件系统的电源电路、射频模块、GPRS模块、主处理器和存储器模块、音视频模块等进行深入研究,给出详细的电路设计方案和原理图,实现了整个硬件系统的设计。其中,针对电源电路,论文分析硬件系统的电源需求,结合系统功耗设计要求,设计系统电源分配方案,选择电源芯片,给出具体电源部分电路。3)完成了机顶盒硬件系统的整体测试,包括电源电压、基本功能、射频信号接收灵敏度和信噪比、音视频指标、智能卡电压时序、遥控性能、显示和按键等等,并给出测试结果和分析。4)给出机顶盒硬件系统测试过程中遇到的问题,描述故障现象,进行测试分析后,给出故障的解决方法。包括非正常启动、GPRS模块、遥控器接收、视频显示异常、视频干扰、音频杂音、数码管工作异常等问题。另外,在机顶盒硬件系统设计与实现过程中,电源系统采用全新的全DC/DC单电源供电设计,整机功耗低于8W,实现户户通机顶盒的超低功耗设计；射频电路设计中,卫星部分采用Tuner on board设计,在保证系统性能的情况下,大幅度降低成本；GPRS模块部分采用on board设计,避免模块对接的不可靠因素,提高系统的可靠性。
[Abstract]:In order to enable people in remote areas to watch television and listen to radio for free, the state has launched a live satellite service, using China's independently launched Zhongxing 9 satellite for live television programs and services, and using terrestrial reception equipment for signal reception. The set-top box is the ground receiving equipment of the direct broadcast satellite system. It is mainly used to receive the signal sent by the direct broadcast satellite. After the signal is converted and processed, the audio and video signal is output to the display device, which is convenient for the user to watch. This paper mainly studies the related standard, hardware principle and design essentials of the satellite home communication set-top box, and accomplishes the design and realization of the hardware circuit of the satellite home communication set-top box based on GX3011. The solutions to the common problems in the design process of the home-to-door STB are also given. The main work of this paper includes: (1) on the basis of briefly introducing the related standards of direct broadcast satellite, the working principle of home communication set-top box, which is based on GX3011 decoder chip, is studied deeply, the demand of the system device is analyzed, and the main components of the system are selected. It includes GPRS module, reset chip, audio and video chip and so on. The hardware circuit structure and function of home communication set-top box are also given. On the basis of above, the paper discusses the power supply circuit of set-top box hardware system, RF module and GPRS module. The main processor, memory module, audio and video module are studied in depth, and the detailed circuit design scheme and schematic diagram are given to realize the design of the whole hardware system. According to the power supply circuit, the paper analyzes the power demand of the hardware system, designs the power distribution scheme of the system and selects the power chip according to the power design requirements of the system. The whole test of set-top box hardware system is completed, including power supply voltage, basic function, RF signal reception sensitivity and SNR, audio and video index, smart card voltage timing, remote control performance, etc. Display and press keys, etc., and give the test results and analysis. 4) give the problems encountered in the testing process of the set-top box hardware system, describe the fault phenomenon, and after testing and analysis, give the solution of the fault. Including abnormal start GPRS module, remote control receiving, video display abnormal, video interference, audio murmur, digital tube work abnormal and so on. In addition, in the design and implementation of the set-top box hardware system, the power supply system adopts a new all-DC/DC single power supply design, the power consumption of the whole machine is less than 8W, the ultra-low power consumption design of the home communication set-top box is realized, and the RF circuit design, The satellite part is designed by Tuner on board, and the cost is greatly reduced by using on board, which can avoid the unreliable factors of module docking and improve the reliability of the system.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN948.55

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