Motion-Induced Noise Modeling of Towed Magnetic Antenna

Motion-induced noise is the main noise that restricts the communication of deeply submerged submarines at extremely low frequencies (ELFs). In this article, a model for analyzing motion-induced noise is established in the context of a long cylindrical antenna towed by a submarine. The model proposed assumes that the antenna vibration caused by vortex obeys Poisson distribution in time and space. The factors involved in the noise generation, such as the speed of the submarine, the length of the towed cable, the transverse motion of the antenna, the pressure of the boundary layer, and the variation of pressure fluctuations with time and space, are further considered in the model. Finally, the derived noise power spectrum from our model shows agreement with the measured data, and has advantages than the result derived from previous work.