南京大学学报（自然科学版）Issue(6)：1195-1202,8.DOI:10.13232/j.cnki.jnju.2015.06.015
线阵阵形畸变对目标方位估计性能影响及校正分析
Research on impact of shape distortion on the target azimuth estimation for soft linear array
摘要
Abstract
Long linear array is more important than shipborne sonar in underwater target detecting and positioning, but it seems more sensitive to the shape distortion at the mean while.In this paper,the array shape distortion effect on soft linear array Direction of Arrival (DOA )estimation performance was studied theoretically,then with simulation and field data process,an array calibration method was put forward.The steering vector of beamforming algorithm was changed when array shape was distorted,which will cause the degradation of line array direction per-formance,so far as to failure.Based on the conventional line array algorithm:Conventional BeamForming(CBF)and Adaptive BeamForming(ABF),in the interest of process the data recorded from the distorted array,this paper first derived the general arbitrary array beamforming algorithm,and based on the impact analysis of array element position error act on the acoustical signal transmission delay,introduced how the beamforming steering vector was influenced by the array shape distortion.Next,an array shape calibration method based on acoustic signal was given, which correct the steering vector through estimating the array shape distortion.At last,the simulation and field data process proved the analysis,the performance of both CBF and ABF beamforming algorithm degradation which caused by the array shape distortion,in contrast,the CBF method was better,it has more robust than ABF method;The accuracy of DOA estimation output and the 3 dB width of main lobe have been significantly improved after ap-propriate array shape distortion adj ustment,for both CBF and ABF algorithm.The method mentioned here also useful to analyze the situation of three dimensional space.关键词
阵形畸变/方位估计/阵形校正Key words
array shape distortion/Direction of arrival(DOA)estimation/array shape adj ustment分类
通用工业技术引用本文复制引用
李建,高明生,解恺..线阵阵形畸变对目标方位估计性能影响及校正分析[J].南京大学学报（自然科学版）,2015,(6):1195-1202,8.基金项目
声场声信息国家重点实验室2015年度开放课题(SKLA201504),国家海洋局南海维权技术与应用重点实验室2013年度开放基金(1306),河海大学中央高校基金(2013B18514),疏浚技术教育部工程研究中心开放课题(HDCN08003) （SKLA201504）
