| 摘要: |
| 针对频率分集条件下，集中式OFDM-MIMO雷达在未知杂波环境中的目标检测问题，首先分析了OFDM-MIMO雷达回波数据模型，由于OFDM-MIMO雷达的频率分集特性，不同频率通道回波数据相互独立，在此基础上，分别基于一步和两步广义最大似然比准则，给出了集中式OFDM-MIMO雷达GLRT和OFDM-MIMO雷达AMF两种检测器，并分析了这两种检测器的恒虚警特性。两种检测器有效利用集中式OFDM-MIMO雷达频率分集特性，提升目标检测性能，同时降低了矩阵求逆维数，以及参考单元数目的要求，并且具有恒虚警性能。计算机仿真验证了算法的有效性。 |
| 关键词: MIMO雷达 频率分集 自适应检测 恒虚警 |
| DOI：DOI:10.3969/j.issn.1672-2337.2019.03.010 |
| 分类号:TN958 |
| 基金项目:国家自然科学基金(No.61401198)；安徽高校自然科学研究重点项目(No.KJ2016A515, KJ2015A198)；江苏省自然科学基金青年基金(No.K2014041565) |
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| Generalized Likelihood Ratio Detector for Colocated OFDM-MIMO Radar |
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WANG Juting，QIAN Yewang，HU Wen
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1.School of Mechanical and Electronic Engineering, Chizhou University, Chizhou 247000, China;2.2. College of Electronic and Information Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
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| Abstract: |
| This paper studies the problem of signal detection in clutter for the colocated OFDM-MIMO radar. With frequency diversity, the data of OFDM-MIMO radar from different frequency channels are uncorrelated each other. Based on this, a one-step and a two-step generalized likelihood ratio test detectors (GLRTD) are firstly proposed which are called GLRT and AMF (adaptive matched filter) respectively. Then, the constant false alarm rate (CFAR) properties of the two proposed detectors are demonstrated. With frequency diversity, target detection performance is improved, also the computational complexity of the two detectors and the secondary range cell numbers for clutter covariance matrix estimation are reduced. The simulation results show the effectiveness of the two detectors. |
| Key words: MIMO radar frequency diversity adaptive detection constant false alarm rate (CFAR) |
