宽带卫星通信实验教学平台的设计  

Design of Experiment Teaching Platform for Wideband Satellite Communication

作　　者：杨德伟[1] 程田丰 王华[1] 

机构地区：[1]北京理工大学通信技术研究所,北京100081

出　　处：《实验室研究与探索》2015年第5期49-51,82,共4页Research and Exploration In Laboratory

基　　金：国家自然科学基金(61072049);北京理工大学实验教学骨干教师培养项目

摘　　要：为满足宽带卫星通信的实验教学改革和科研创新需要,设计并搭建了宽带卫星通信实验教学平台。该平台由信源处理单元、宽带调制解调器、噪声发生器、多路数据复用/解复用器等模块组成,具备典型的卫星通信中频链路传输功能。通过该系统,学生可以自行选择视频/音频信号及以太网数据进行传输。通过参数配置,该系统可以实现多频段、多种编码调制方式的传输要求,在较低信噪比下仍有良好性能。该系统在中频部分采用噪声发生器产生高斯白噪声来模拟卫星信道由于功率损耗产生的信噪比变化,可以使学生更好地理解卫星通信的重要概念和关键参数。另外,通过设计和搭建宽带卫星传输系统,学生可以加深对新型卫星通信链路传输原理的掌握和信号处理算法的理解。To meet the need of the teaching experiment reform and innovation of satellite communications, a teaching experiment platform of wideband satellite communications is constructed based on the practical application. The system is made up of the data source processing units, wideband modulator and demodulator, the noise generator, the multiplexer and the demuhiplexer ete, and has the typical intermediate frequency （IF） transmission link function in the satellite communication. Through the system, the video signal, the audio signal and the Ethernet data can be the transmitted selectively and flexibly. Besides, the system can implement multi-frequency transmission with various code modulation schemes by the parameters configuration, and has a good performance even under the low SNR conditions. In the IF section, the noise generator which generates the Gaussian white noise and simulates the SNR variation owing to the power loss is adopted by the system, and the students can understand the important concepts and the key parameters much better in the satellite communication. Through designing and building the wideband satellite transmission system, students can grasp the transmission theories of the new satellite communication link profoundly and understand the signal processing algorithms thoroughly. The students can also use the modularized platform to develop innovative experiments, which can help students combine the theories with the engineering practice and offer original data for students＇scientific research. After the platform has tried out, the quality is significant.

关 键 词：卫星通信链路 实验教学平台 模块设计 调制解调 

分 类 号：TN911.7[电子电信—通信与信息系统]