基于OFDM波形的机载雷达地面运动目标检测  

Ground Moving Target Detection Using Airborne Radar Based on OFDM Waveform

作　　者：柳丽召[1] 王力 LIU Li-zhao;WANG Li(Chengdu University of Technology,Chengdu 610059,China;Hunan Institute of Science and Technology,Yueyang 414006,China)

机构地区：[1]成都理工大学,四川成都610059 [2]湖南理工学院,湖南岳阳414006

出　　处：《中国电子科学研究院学报》2019年第6期568-572,617,共6页Journal of China Academy of Electronics and Information Technology

摘　　要：研究基于正交频分复用( orthogonal frequency division multiplexing,OFDM)波形的机载雷达对于地面运动目标的检测。OFDM 波形作为一种新型的动目标检测模型,具有良好的频谱利用率和动态分配能力,并且能够利用单通道来实现信号的发射接收从而节约成本、降低复杂度。建立了考虑机载雷达与地面静止杂波相对运动的回波模型并在此基础上采用广义似然比检验( generalized likelihood ratio,GLR)来解决杂波抑制和目标检测的问题。该方法采用最大似然估计( maximum likelihood estimate,MLE)估计杂波抑制所需但未知的参数。此外,本文还推导了目标的检测与虚警概率的关系,获得了不同信杂比( target-to-clutter ratio,TCR)下的目标最小可检速度( minimum detection velocity,MDV)。为测试GLR检验的性能,基于若干仿真数据进行了实验。The paper focuses on the ground moving target indication of airborne radar using orthogonal frequency division multiplexing ( OFDM) waveform.As a new kind of detecting waveform,OFDM waveform has the ability to not only increase the frequency diversity of the system but also allocate the spectrum dynamically.Furthermore,it could transmit and receive signals from each sub-carrier,which can save the cost and simplify the experiment operation.To solve the problem of clutter suppression,a raw echo model is built considering the relative motion of ground static clutter in the airborne radar,based on which a new generalized likelihood ratio ( GLR) test is proposed for both clutter suppression and moving target detection,following with the analyses of performance.In this test maximum likelihood estimate ( MLE) is used,it is easy to get unknown but necessary parameters and to suppress the clutter. The probabilities of detection and false alarm are also deduced,and then the minimum detection velocity ( MDV) with different target-to-clutter ratio ( TCR) is obtained. Experiments are conducted on numeral simulations to evaluate the effectiveness of the proposed method.

关 键 词：正交频分复用 机载雷达 杂波抑制 运动目标检测 最小可检速度 

分 类 号：TN957.51[电子电信—信号与信息处理]