王党卫,
马晓岩
空军预警学院 ??武汉 ??430019
基金项目:国家自然科学基金(61179015)
详细信息
作者简介:李星星：男 1988年生，博士生，研究方向为MIMO雷达信号处理、自适应波束形成与目标定位
王党卫：男 1977年生，副教授，研究方向为MIMO雷达信号处理、目标成像与识别
马晓岩：男 1962年生，教授，博士生导师，研究方向为雷达系统、雷达信号处理与检测理论、现代信号处理及其应用
通讯作者:李星星 ?li_x_xing@163.com
中图分类号:TN957计量
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被引次数:0
出版历程
收稿日期:2017-11-01
修回日期:2018-04-26
网络出版日期:2018-06-07
刊出日期:2018-08-01
Beam Performance and Optimization Method for Meter-wave Frequency Diverse MIMO Radar in Multipath Scenario
Xingxing LI,,Dangwei WANG,
Xiaoyan MA
Air Force Early Warning Academy, Wuhan 430019, China
Funds:The National Natural Science Foundation of China (61179015)
摘要
摘要:针对传统米波雷达低仰角下波瓣分裂和盲区问题，该文提出一种频率分集子孔径MIMO雷达，构建了该体制下多径特性定量分析的理论框架，推导了镜面反射和扰动多径模型及其联合发射-接收方向图增益闭合表达式；提出了多径抑制区概念及其边界条件，定义了描述低空波束覆盖性能的低可观测率定量评价指标；根据边界条件的解集优化了波束覆盖性能。理论分析和仿真结果表明由于充分利用了频率分集产生的距离依赖波束，该体制雷达相对传统MIMO相控阵雷达具有更优的低空波束覆盖性能，减小了米波雷达波瓣分裂和探测盲区。
关键词:频率分集MIMO雷达/
距离依赖波束/
多径特性/
低空波束性能
Abstract:Traditional meter-wave radar usually suffers from the problem of Beam Split (BS) and Radar Blind Area (RBA) in the situation of low-grazing angle. To alleviate this difficulty, a Frequency Diverse Subaperturing Multiple-Input Multiple-Output (FDS-MIMO) radar is proposed and a theoretical framework for the analytical investigation of multipath characteristics is presented. The specular and perturbational multipath model is built, along with closed-form expression of the joint transmit-receive beampattern gain. Moreover, a notional concept of Multipath Mitigation Area (MMA) is defined together with the corresponding boundary conditions, and the Low Observability Rate (LOR) is defined as a performance benchmarkan to evaluate the FDS-MIMO radar beam overage capability. Next, the FDS-MIMO radar low-altitude beam coverage performance is optimized according to the soutions of the boundary conditions. Both theoretical analysis and numerical results demonstrate the advantages of FDS-MIMO radar over the conventional phased-MIMO radar in terms of low altitude beam coverage performance, and the BS and RBA of meter-wave radar is decreased by ultilizing the range-dependent beampattern.
Key words:Frequency diverse MIMO radar/
Range-dependent beampattern/
Multipath characteristcs/
Low-altitude beam performance
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