“户户通”支持免费接收地面数字电视节目,要求接收机具有“双模”功能,可以实现对直播卫星节目和当地地面数字节目的双向接收。笔者在此以卫星直播系统综合接收解码器(卫星地面双模型)和1000W国际数字电视发射机系统为例,对直播卫星户户通双模接收机地面接收和地面数字电视发射原理展开探究。 “Every household ” supports free receiving terrestrial digital television programs, requiring the receiver has “dual mode ” function, can achieve direct broadcast satellite programs and local terrestrial digital programs two-way reception. In this paper, we take the satellite receiving system integrated receiver decoder (satellite terrestrial dual model) and 1000W international digital television transmitter system as an example to probe into the principle of direct receiving satellite terrestrial dual-mode receiver ground receiving and terrestrial digital television transmitting principle.