局域增强系统中VDB发射电台前向纠错编码技术研究与实验

摘要

A VDB transmitter in Local Area Augmentation System is a kind of special TDMA-based data communication equipment for aviation. The paper researches the composition and data processing of VDB, analyzes theoretically how to improve performance of VDB communication system by using FEC RS (255,249). In addition, the combination of signal generator and computer is used to build an experiment of VDB transmitter for observing the VDB transmitting signals, together with simulation system of VDB communication by MATLAB. The simulation shows that FEC coding can improve the performance of VDB communication system.%　　局域增强系统中的甚高频数据广播电台是一种基于 TDMA 技术的航空专用数据传输电台，本文对用 VDB 电台结构和数据处理方式进行了研究，对采用 RS(255,249)前向纠错编码提高 VDB 通信系统性能进行了理论分析。最后利用矢量信号发生器和电脑搭建了实验环境，并且利用 Matlab 搭建 VDB 通信仿真系统，仿真验证了 FEC 编码可以提升 VDB 通信系统性能。