分布式MIMO数字阵列雷达阵元优化配置

发布时间：2018-10-11 09:55

【摘要】：为了合理分配相参增益和空间分集增益在分布式多输入多输出(MIMO)数字阵列雷达系统中的比重,研究了其阵元的优化配置问题。首先,根据MIMO雷达信号模型将阵元配置问题转化为目标散射系数矩阵的分块划分问题;然后,依据子块内信号相参处理,子块间信号非相参处理的方式推导了似然比检测器;最后,分别从检测概率最大、探测距离最远和总的阵元数最少三个方面给出了阵元优化配置的表达式并进行了仿真分析。研究结果表明:应首先利用相参增益将回波信噪比提高到一定值后才能利用空间分集增益;分置接收天线比分置发射天线牺牲的相参增益少;当检测概率大于0.8时,分置两个收发共用的相控阵天线可使系统阵元总数最少,否则无需天线分置。
[Abstract]:In order to reasonably allocate the proportion of coherent gain and spatial diversity gain in distributed multi-input and multi-output (MIMO) digital array radar systems, the optimal configuration of the array elements is studied. Firstly, according to the MIMO radar signal model, the array element assignment problem is transformed into the block partition problem of the scattering coefficient matrix of the target, and then the likelihood ratio detector is derived according to the signal coherent processing in the sub-block and the non-coherent signal processing between the sub-blocks. Finally, the expressions of the optimal configuration of the array elements are given from three aspects: the maximum detection probability, the longest detection distance and the least total number of elements, respectively, and the simulation analysis is carried out. The results show that the spatial diversity gain can be used only when the echo signal to noise ratio is raised to a certain value by using the coherent gain, the received antenna is less than the coherent gain sacrificed by the discrete transmit antenna, and when the detection probability is greater than 0.8, the signal to noise ratio (SNR) of the echo can be increased to a certain value. The total number of array elements in the system can be minimized by splitting the phased array antenna with both transceivers and transceivers, otherwise, there is no need to separate the antenna.
【作者单位】：空军预警学院陆基预警装备系;中国人民解放军94201部队;
【基金】：国家自然科学基金资助项目(61401504) 中国博士后科学基金资助项目(2014M562562)
【分类号】：TN958

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