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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。
In order to rationally allocate the proportion of the coherent gain and the spatial diversity gain in a distributed multiple input multiple output (MIMO) digital array radar system, the optimal configuration of the array element is studied. Firstly, the array element configuration problem is transformed into the block division problem of the target scattering coefficient matrix according to the MIMO radar signal model. Then, the likelihood ratio is deduced according to the signal co-processing in the sub-block and the non- Finally, the expression of optimal configuration of array element is given and the simulation analysis is carried out from three aspects: the detection probability is the maximum, the detection distance is the farthest and the total number of elements is the least. The results show that the space diversity gain should be used only when the echo signal-to-noise ratio is increased to a certain value by using the coherent gain first. When the probability of detection is greater than 0.8, Set two receive and dispatch common phased array antenna can make the total number of system elements a minimum, otherwise no need for antenna separation.