摘要
针对水下声呐成像算法中旁瓣电平过高的问题,提出一种基于凸优化的3D变迹函数优化方法,用于成像算法之前,以求在波束形成中获得较低旁瓣电平。利用凸优化算法高效求解满足约束条件的阵元激励权值,将激励权值形成一个3D变迹函数,以幅度变迹的方式作用于各阵元接收的信号,并对幅度变迹后的各阵元接收信号采用延时叠加方法波束形成并成像。以主瓣宽度和峰值旁瓣电平作为衡量波束性能的指标,将所提出方法与切比雪夫窗函数方法和未经变迹函数方法处理进行对比,并进行成像仿真。实验结果表明:所提出方法可以有效地抑制波束峰值旁瓣电平,提高成像对比度。
Aiming at the problem of excessive sidelobe level in underwater sonar imaging algorithm,a 3D apodization function optimization method based on convex optimization is proposed in the paper,which is used to obtain lower sidelobe level in beamforming before imaging algorithm.The convex optimization algorithm is used to efficiently solve the excitation weights of the array elements satisfying the constraints,and the excitation weights are formed into a 3D apodization function,which acts on the signals received by the array elements in the manner of amplitude apodization,and the array element receives the signal using a delay and sum method for beamforming and imaging.The main lobe width and the peak side lobe level are used as the indicators to measure the beam performance.The proposed method was compared with the chebyshev window function method and the un-anisotropy function method,and the imaging simulation was carried out.The experimental results show that the proposed method can effectively suppress the beam peak sidelobe level and improve the imaging contrast.
作者
李鹏
宋逸君
俞传富
夏翔
LI Peng;SONG Yi-jun;YU Chuan-fu;XIA Xiang(Jiangsu Collaborative Innovation Center on Atmospheric Environment and Equipment Technology,Nanjing University of Information Science and Technology,Nanjing Jiangsu 210044,China;Jiangsu Key Laboratory of Meteorological Detection and Information Processing,Nanjing University of Information Science and Technology,Nanjing Jiangsu 210044,China)
出处
《计算机仿真》
北大核心
2020年第2期183-187,410,共6页
Computer Simulation
基金
国家自然科学基金资助项目(41075115)
江苏省重点研发计划社会发展项目(BE2015692)。
关键词
凸优化
三维变迹函数
旁瓣抑制
水下正视成像
Convex optimization
3D apodization function
Sidelobe suppression
Underwater emmetropic imaging
