Research On The Phenomena Of Counteraction And Phase Property In The Vector Sound Field

The vector hydrophone gives attention to two aspects: the vector quantity and scalar quantity, so more attention is paid on it. Surrounding the making of the vector hydrophone , the signal processing and application ,a new subject--ocean vector acoustics— has been gradually formed, which studies thevector property of the sound field in ocean .Good development is made in the application of military affairs in the future.The thesis puts the emphases on the study of the counteraction of acoustic energy flux in the coherent noise field, and on the statistic property of the phase difference in the aspect of signal detection, from which the difference between signal and noise in essence can be found .The difference offers theoretic gist to the implement of noise detection in the complex ocean noise field.The purpose of the thesis is to construct perfect model of vector sound field. By means of constructing some corresponding concepts, accurate description of vector field is given. It provides the basic properties of the vector hydrophone and analysis of the principle of its anti-interference. By analyzing the superposition of the two plane harmonic waves whose directions of propagation are opposite, the corresponding model is constructed and the simulation is analyzed. Combining the spectral map of deep-sea trial, the concepts -"negative gain"-is given, the model of the best energy detector is also given. The thesis analyzes the principle of jump phase, and constructs the model of object' moving situation by exerting the vector hydrophone. The phase difference of Sound pressure and vibration velocity is studied, including the mean and variance of change rate of phase difference .The result of the study indicates: the change rate of phase difference in compound body of signal and noise has good stability, when the SNR is low, it...