浅海声信道“时域衰落”特性研究

A STUDY ON THE TIME-DOMAIN ATTENUATION CHARACTERISTICS OF A SHALLOW SEA ACOUSTIC CHANNEL

研究了浅海声信道“时域衰落”与海况、波高、中心频率和作用距离的关系。结果表明：在相同海况下，波浪愈高，振幅起伏愈明显；在同样作用距离、深度下，中心频率２０ｋＨｚ是信道较好的传播频率，其振幅起伏小，自相关时间较长；在该声道中，作用距离在２０００─２５００ｍ处振幅起伏最大。

This paper studies the relations between 'time-domain attenuation' and sea state or wave height, center frequency or transmitting range. It is shown that (1) under similar sea state conditions, the higher the wave heights, the more serious the amplitude fluctuations;(2) in the experimental sea area, the center frequency 20 kHz was a better transmission frequency, i. e. less amplitude fluctuation and longer autocorrelation time;(3) the amplitude fluctuation was maximum at a transmitting range of about 2 0002 500m in the experimental sea area.