波束-多普勒酉ESPRIT多目标DOA估计  

Multi-target DOA Estimation Using Beam-Doppler Unitary ESPRIT

作　　者：文才 吴建新[2] 王彤[2] 周延 彭进业[1] WEN Cai;WU Jianxin;WANG Tong;ZHOU Yan;PENG Jinye(School of Information Science and Technology,Northwest University,Xi’an 710069,China;National Laboratory of Radar Signal Processing,Xidian University,Xi’an 710071,China)

机构地区：[1]西北大学信息科学与技术学院,西安710069 [2]西安电子科技大学雷达信号处理国家重点实验室,西安710071

出　　处：《电子与信息学报》2018年第5期1136-1143,共8页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(61471285;61371233);陕西省教育厅科研计划项目(17JK0789)~~

摘　　要：高分辨波达方向(DOA)估计是地基/空基预警雷达实现主波束内多目标精细跟踪需要解决的关键问题。针对上述问题,该文提出一种波束-多普勒酉ESPRIT多目标DOA估计算法。该方法首先通过时域平滑技术构造多个快拍。然后采用中心共轭对称傅里叶变换矩阵将数据变换至波束-多普勒域,同时保留旋转不变结构。最后采用实值ESPRIT算法估计目标的DOA。所提方法充分利用了信号的时域信息来改善空域参数估计性能,同时具有较低的计算复杂度。实验结果证明了所提方法的有效性。High-resolution Direction Of Arrival （DOA） estimation is a critical issue for mainbeam multi-target tracking in ground-based or airborne early warning radar system. A Beam-Doppler Unitary ESPRIT （BD- UESPRIT） algorithm is proposed to deal with this problem. Firstly, multiple snapshots without spatial aperture loss are obtained using the technique of time-smoothing. Then the conjugate centrosymmetric Discrete Fourier Transform （DFT） matrix is used to transform the extracted data into beam-Doppler domain. Finally, the rotational invariance property of the space-time beam is exploited to estimate DOA. Since the proposed algorithm takes full advantage of temporal information and is implemented in low-dimensional beamspace, the DOA estimation accuracy can be improved greatly with dramatically reduced computational complexity. Numerical examples are given to verify the effectiveness of the proposed algorithm.

关 键 词：波达方向估计 目标跟踪 时域平滑技术 波束空间ESPRIT 

分 类 号：TN957.51[电子电信—信号与信息处理]