针对短波信道具有多径衰落和不可逆性等特点,提出了改进的窄带短波信道模型及仿真实现算法。该模型以美国电信科学协会(ITS)提出的宽带短波信道模型为基础,经过适当的近似与简化,得到了适于计算机仿真的实现结构。改进的窄带短波信道仿真模型考虑了各个传播模式内的时延扩展,消除了经典Watterson窄带短波信道模型的使用限制,能够仿真更广泛的短波信道条件。 Aiming at the characteristics of HF channel such as multipath fading and irreversibility, an improved narrowband HF channel model and its algorithm are proposed. The model is based on the broadband shortwave channel model proposed by the American Telecommunication Science Association (ITS). After appropriate approximation and simplification, the realization structure suitable for computer simulation is obtained. The improved narrowband shortwave channel simulation model considers the delay spread in each propagation mode, eliminates the limitation of the classical Watterson narrowband shortwave channel model and simulates the wider shortwave channel conditions.