摘要
针对空间欠采样情况下的角度估计模糊问题,本文提出了一种基于多载频的分布式目标波达方向(Direction of Arrival,DOA)估计方法。该方法首先把阵列接收的空时二维回波数据重新组成新的空时频三维数据,然后利用多载频技术来构造空时最优处理器滤除地杂波并匹配目标信号,最后利用最优处理器的输出结果对目标DOA进行估计,能够在空间欠采样情况下获得分布式目标中心DOA的准确估计。仿真结果表明了该方法的有效性。
A multi-carrier frequency based direction-of-arrival(DOA)estimation method for distributed targets is proposed for solving angle ambiguities under space sub-Nyquist sampling.First,three-dimensional space-time-frequency matrix is built based on two-dimensional space-time echoes data received by array;then space-time optimal processor is built by using multi-carrier frequency technique for clutter suppression and target signal matching.Central DOA of distributed targets can be estimated accurately under space sub-Nyquist sampling by using output of the space-time optimal processor.Simulation results show the effectiveness of the method proposed.
作者
李海
居梦琪
章涛
吴仁彪
Li Hai;Ju Mengqi;Zhang Tao;Wu Renbiao(Civil Aviation University of China,Tianjin 300300)
出处
《火控雷达技术》
2018年第2期7-13,共7页
Fire Control Radar Technology
基金
国家自然科学基金项目(编号:61471365
U1733116
U1633106)
中国民航大学蓝天青年学者培养经费
中央高校基本科研业务费项目(3122017007)
关键词
空间欠采样
模糊
DOA估计
多载频
分布式目标
space sub-Nyquist sampling
ambiguity
DOA estimation
multi-carrier frequency
distributed target
