Technology Research, Based On The Vector Hydrophone Adaptive Ship Noise Offset

Compared with the pressure hydrophone, vector sensors have many advantages. In this dissertation, we study directivity of acoustic vector sensor to research the method of canceling vessel noise that based on towed vector sensors. The dipole and pressure, vibration velocity combined directivity of single vector sensor are studied and the charts of the directivity are drawn by using the real-data. For resolving the problem of canceling vessel noise, the system of adaptive vessel noise canceling by towed vector sonar presents based on picking-up the noise signal by using end-fire beamforming of vector sensor. Therefore, Adapt noise canceling is used to resolve the problem of canceling vessel noise successfully All the methods are verified by computer simulations and real-data processing. The main content can be outlined as follows:The first chapter is an introduction. Introduce researches about vector transducer and vessel noise canceling both native and foreign.In the second chapter, we study the working principle of the vector transducer. mainly the calculation mould,receiving signal mathematic mould,azimuth calculation. And then, we study the vector transducer beamforming algorithm for dipole and pressure, vibration velocity combined directivity.The third chapter introduces the method of Adaptive Signal Processing, especially the mathematic model about LMS and Adaptive noise canceling.The forth chapter studies the time- frequency character of the vessel noise, introduce the methods of normal noise canceling and vessel noise canceling.The fifth chapter presents two method of vessel noise canceling by using the towed vector sensors each based on two characters of the vector sensors.In the sixth chapter, the system of adaptive vessel noise canceling by towed vector sonar are performed using experimental data collected from lake and cistern experiment.In seventh chapter, summarize the work of this dissertation and some suggestions are advanced.In summary, in this dissertation it is proved by theory deducing, computer simulations and real-data processing that the system of adaptive vessel noise canceling by towed sonar can canceling the vessel noise and advance the DOA (Direction-of-Arrival) precision of the towed vector sonar.