大气声波超视距传播的射线追踪

The Ray-Tracing of Atmospheric Acoustic Over-the-Horizon Propagation

基于射线声学的基本原理,利用MSISE-00和HWM93两个模型建立了在真实大气环境中声波传播的模型.模拟了长春、酒泉和泉州在不同季节时,地面声源出射声线的轨迹.数值模拟结果表明,大气声波的超视距传播,是大气温度场与风场控制的结果,且这种超视距传播的声信道比较稳定,其反射高度近似在50 km或120km.当声波反射高度在50 km以下时,单跳传播距离约为250 km.该声线模型可以精确地估计大气声波传播的路径.

A numerical atmospheric acoustic propagation model is developed in this paper. This model is based on the theorem of ray acoustics and created by MSISE-00 model and HWM93 model. The ray traces of Changchun, Quanzhou and Jiuquan at different seasons are calculated and plotted by using this model. According to the results, the over-the horizon propagation of atmospheric acoustic wave is controlled by the structure of atmospheric wind and temperature, and the acoustic channel is stable. The height of reflected wave is about 50 km or 120 kin. When the height of reflection is less than 50 km, the acoustic skip distance is about 250 km in horizontal distance. The ray trace can be calculated accurately by using the numerical model.