传播损失 meaning in English

propagation loss

An acoustic wave propagation model in low frequency multi - layered media of shallow sea
浅海低频多层介质中声传播损失的数学模型
The propagation characteristics of underwater acoustic channels and their influences on long - range information transmission are studied thoroughly . based on the sonar equation , the optimal frequency band is abtained . from the calculation about transmission loss , the source level is forecasted . based on the random time varying channel theory , the fading characteristics of long - range underwater acoustic channels are analyzed
系统、深入地研究了水声信道特性及其对水声远程信息传输系统的影响；从声纳方程出发，确定了系统的最佳工作频段；在声传播损失计算的基础上，给出了声源级的预报；基于时变信道理论，描述了远程水声信道的衰落特性。