基于声矢量场处理的海洋内波预警监测技术

Early Warning and Monitoring Technology of Marine Internal Wave Based on Acoustic Vector Field Processing

目前的海洋内波检测技术在实际应用中误差大,受海洋环境影响显著,且无法自主识别。针对这一问题,文中提出了一种基于矢量场处理的海洋内波预警的监测方法。该方法基于声压和质点振速联合信息处理,利用超低频矢量水听器拾取的声场三维信息,可在复杂的海洋背景噪声场中根据方位估计算法对非协作目标进行时-空-频三维跟踪与锁定。内波的到来引起了三维声速剖面的变化,而声场的起伏则导致跟踪的目标信号源声能流强度改变。该方法根据目标信号在内波空间里的信道畸变引起垂直维掠射角异常跳变来实现海洋内波的监测和预报。仿真结果表明,在正常环境中垂直维掠射角略有浮动,变化范围较小;当内波来袭,掠射角发生强烈突变,且最大偏转可突变至负向角度,证明了所提方法的有效性。

In practical applications,the current ocean internal wave detection technology has large errors,and is significantly affected by the marine environment,and cannot be identified independently.In view of these problems,this study proposes a monitoring method for ocean internal wave early warning based on vector field processing.This method is based on the combined information processing of sound pressure and vibration velocity,and uses the three-dimensional information of the sound field picked up by the ultra-low frequency vector hydrophone.The time-space-frequency three-dimensional tracking and locking of non-cooperative targets can be carried out in the complex ocean background noise field according to the azimuth estimation algorithm.The arrival of internal wave causes the change of the three-dimensional sound velocity profile.The fluctuation of the sound field will lead to the change of the acoustic energy flow intensity of the target signal source.This method realizes the monitoring and prediction of ocean internal waves based on the abnormal jump of the vertical grazing angle caused by the channel distortion of the target signal in the internal wave space.The simulation results show that the vertical grazing angle fluctuates slightly in a normal environment,and the range of change is small.When the internal wave strikes,the grazing angle changes strongly,and the maximum deflection can be abruptly changed to a negative angle,which proves the effectiveness of the method.