Research On The Long Time Integration And Matched Field Mixed Processing In Acoustic Target Localization

This thesis has studied the main body of a book under shallow sea environment, principle, method, and the analysis being in progress with simulated signal adopt longtime integration points and the matched-field processing to blend the allocation handling a technology being used for acoustic source target localization.First, the thesis expounds research background, significance first respectively to the problem studying current situation has been in progress at home and abroad, spread a model immediately next to the sound field having introduced several kinds numerical value at present in common use, the model spreading condition being in progress to the sound field building a model, adopt letter to set a wave right according to representative shallow sea middle sound accomplishes one kind of speedy, accurate effective and stable numerical value reckoning. Lead into longtime integration principle, method of matched-field processing. Subsequently, this thesis we have studied the optimization problem of this method. We adopt simulated annealing method to search the optimal solution of the correlation coefficient through simulate annealing procedures. This method can find the global best solution and enhance the search speed about one order than grid method do. Then, under studying the commixture making use of long time accumulation and the matched—field processing handles the method being used for acoustic source target allocation and has the shortcoming, different by the two kinds together condition mainly: One kind of condition is that the simulated signal adopt letter to rectify the wave form, the copy signal adopt the plane wave form; Another one kind of condition is that the simulated signal and the copy signal all adopt letter to rectify the wave model. Simulated result is indicated: When disseminates in the sea water when the sound signal wave-guide phenomenon is not obvious, regardless of the copy signal uses the plane wave model or the normal wave model, the acoustic target all can be localized precisely. The article finality carries out analysis on the factor affecting allocation accuracy various studying. Result is indicated: Sound velocity grad and seawater depth loss be qualified for in seawater is the major factor weighing to allocation accuracy.