关于传播路径的潜艇目标信号优化探测研究  

Research on Propagation Paths of Submarine Detection Target Signal Optimization

作　　者：张立琛[1] 王英民[1] 郭拓[1] 

机构地区：[1]西北工业大学航海学院,陕西西安710072

出　　处：《计算机仿真》2016年第3期177-181,206,共6页Computer Simulation

基　　金：国家自然科学基金(13401367)

摘　　要：采用极低频电磁场探测潜艇信号时,电磁波的传播路径是影响探测距离的重要因素之一。根据直达波的水下电磁场分布模型,通过直达波远距离探测潜艇的电磁场信号是不可能的。基于电磁波理论,根据磁偶极子性能,考虑空气、海水、海底三层各向同性的分层模型,推导出海水中垂直磁偶极子激发的海水中电磁场表达式,进一步采用数值方法,计算了海水中电磁场的分布和各个传播路径的传播规律。结果表明,侧面波对远场的电磁场场强起主要作用,反射波和直达波贡献可忽略不计;场源和场点靠近海面时,海面侧面波起主要作用;靠近海底时,海底侧面波起主要作用,在远场情况下,总场有可测量的量级。证明由于侧面波的存在,通过极低频电磁波远距离探测潜艇是可行的。Referring to the anti-submarine by using extremely low frequency electromagnetic wave, the propagation paths play an important role in the detection range. According to the underwater electromagnetic field distribution model of direct wave, it is impossible that the electromagnetic field signal is detected in a far field. Based on the theory of electromagnetic wave. The electromagnetic fields in seawater due to a vertical magnetic dipole submerged in the sea seawater later were derived. The analytical expressions were obtained with the model of a three-layered conduc- ting medium. The simulation results show that lateral wave plays main role in the electromagnetic field intensity of far -field, and the contributions of reflection wave and direct wave can be ignored, when the transmitter and receiver close to sea surface or seafloor, which plays a major role. The magnitudes of the electromagnetic fields in seawater are measurable for the far - field. It is concluded that extremely low frequency electromagnetic wave is feasible in the anti-submarine for the far-field.

关 键 词：侧面波 三层模型 垂直磁偶极子 极低频 反射波 直达波 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]