DRM在广播节目传输中的应用

Application of DRM to Broadcast Transmission

通过介绍西藏小功率中波、调频转播台在改善覆盖效果,提高边远地区综合覆盖率的特殊作用,并分析了其节目源单一依赖卫星的弊端.对DRM广播抗干扰、抗多径效应等的机理进行研究,提出对大功率发射台大功率中短波发射机进行DRM广播改造,用于节目源信号的传输,研究结果表明:DRM广播作为小功率中波、调频转播台的备用节目传输通路,成本低、可靠性高、易于实现.

This thesis deals with the special effects that the rebroadcast stations of low-power medium wave, frequency modulation have in bettering and enlarging their coverage in remote districts in Tibet. The disadvantages of the program resource only relying on satellite transmission are analyzed. Relevant research is carried out on the anti-jamming theories and anti-multipath effect. It is raised that high- power transimitters can be modified to launch programs through DRM radio, which can be used to transimit program source. It is proved that, as a transimission medium of the backup programs, low- power medium wave, frequency modulation rebroadcast stations, RDM radio is leconomical, reliable, and easy to handle.