The key parameter selection in asynchronous multiplexing at low rate in scatter channel is designed. Considering the low rate characteristic of scatter channel and the need of engineering, positive/zero/negative justification is used in asynchronous multiplexing. The parameters of frame structure, data rate justification, data rate recovery ete are calculated with mathematical formula. The method is proved correct by test, providing theoretical basis for asynchronous multiplexing design in project applications. Finally the paper describes the importance of low-rate asynchronous multiplexing application in scatter communication.%主要提出了低速率散射链路异步复接的关键参数选取方法,结合散射链路低速率特性和工程应用需求,在异步复接中采用正/0/负码速调整技术,通过公式计算推导出帧结构、码速调整和码速时钟恢复等关键参数的工作范围,经试验测试验证了关键参数选取的正确性,为工程实现异步复接提供了理论设计依据,最后提出低速异步复接在散射链路中的重要意义.
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