Study On Method Of Multiple Sub-array Beam-space In Sonar Imaging

In recent years,With the decline of land renewable resources,Countries are increasingly focused on the scramble for Marine resources,Submarine resources can bring great benefits both in military and civilian areas.Therefore,the exploration of topographic features and targets in seawater has become a hot topic in the world.And images as the most intuitive observation method is more popular.Underwater acoustic imaging system is a complex system,is the most commonly used for imaging sonar sounding side scan sonar and multibeam sounding sonar,the multi-beam sonar sounding for has wide coverage and high precision has become the most popular in the field of sonar equipment.this paper will research focus on the estimates of parameters in pretreatment part.In order to obtain the underwater acoustic image,it is necessary to accurately estimate the echo intensity of the echo azimuth,echo arrival time and echo direction.Where IOA can be obtained by the amplitude information on the echo signal.DOAestimation technique is the focus of the research to develop a variety of high resolution azimuth algorithms.Then the echo TOA corresponding to the azimuth Angle is obtained by amplitude detection method,phase detection method or both.And the phase detection method has the advantage of overwide coverage,so a series of detection methods are developed in the traditional split beam phase detection methodIn this paper to solve the problem of multi-beam sounding sonar using traditional split beam phase accuracy of DOA and phase difference detection method in the fuzzy interval cannot coexist this problem,introduction of sounding three of sidescan sonar array yuan phase center cross-correlation technology,Combining it with beamforming technology to explore its performance under different conditions,the main tasks are as follows:1)Split beam phase detection method of DOA is derived and the phase difference of the expression of fuzzy interval,analysis its limitations sounding side scan sonar arrays three phase center of cross-correlation techniques can be introduced into the possibility of multi-beam sounding sonar,According to the mutual technology of the phase center of the beam region,the DOA and the position difference non-fuzzy interval are obtained,and its estimated performance is theoretically analyzed to verify its feasibility.2)on the basis of the theoretical derivation,under the same conditions of traditional phase splitting beam detection technology and BPCCC technology for computer simulation,validation BPCCC technical performance,and analysis of its advantages.3)The analysis and summary show that BPCCC can guarantee the length of DOA high-precision and non-fuzzy interval in the main beam,thus breaking the limitation of traditional methods and having better performance.