阵形畸变对拖线阵三维探测性能的影响及补偿技术

Effect of Array Shape Distortion on 3D Detection Performance of Towed Line Array and Compensation Technique

针对拖曳阵阵形畸变导致的目标检测不准确问题,首先,分析了阵形畸变对拖线阵三维探测性能的影响,并论证了利用实际阵形在垂直方向形成的孔径实现对目标深度信息提取可行性;然后,依据拖线阵中姿态与深度传感器监测数据,提出一种基于阵形自动拟合的三维补偿技术;最后,通过三维补偿技术修正导向矢量,降低导向矢量与协方差矩阵之间不匹配度,解决阵形畸变所导致的目标检测不准确问题。数值仿真结果表明,对畸变阵形进行三维阵形估计和补偿,实现了对未知目标的三维探测,且避免了标校声源对拖线阵实时探测目标的影响,便于工程应用。

For the discontinuous problem of the target detection caused by the array shape distortion of the towed line array, firstly,the influence of the array shape distortion on the 3D detection performance is ana-lyzed ,and the feasibility of extracting target depth information is demonstrated via the actual array shape forming the aperture in the vertical direction. Then,according to the monitoring data of the attitude sensor and depth sensor,a 3D compensation technique based on array shape automatic fitting is proposed. Final-ly ,the steering vector is modified by the 3D compensation technique to reduce the mismatch between the steering vector and covariance matrix,and the discontinuous problem of the target detection caused by the array shape distortion is solved. The results of numerical simulation show that,estimation of the 3D array shape and compensation for the distortion array shape can achieve 3D detection of underwater unknown tar- get,avoid the influence of calibration source on the real-time detecting target,and is convenient for engi-neering application.