HARQ是基于ARQ与FEC的不足而提出的一种新的差错控制方式,作为3G的核心技术之一,对提高数据的可靠性、有效性起到了重要的作用,但在卫星通信环境下,HARQ技术并没有得到深入研究。文中主要基于卫星通信环境,对Ⅱ型和Ⅲ型HARQ在误帧率,平均传输次数,有效通过率以及系统吞吐量方面进行比较分析,得出针对不同业务选择HARQ的依据,为其今后在卫星通信中进一步应用提供必要的参考依据。 HARQ is a new error control method based on the shortage of ARQ and FEC. As one of the core technologies of 3G, HARQ plays an important role in improving the reliability and validity of data. However, in the environment of satellite communication, HARQ Technology has not been studied in depth. Based on the environment of satellite communication, this paper mainly analyzes the frame error rate, the average number of transmissions, the effective transmission rate and the system throughput of Type II and Type III HARQ, and draws the basis for choosing HARQ for different services. In the future, Further application in communications provides the necessary reference.