分布式MIMO数字阵列雷达检测性能研究

Research on detection performance for distributed MIMO digital array radar

提出了一种多输入多输出(MIMO)雷达模型,并分析了其检测性能.首先,建立了MIMO雷达的观测模型,并在此基础上给出了一定搜索范围和搜索周期条件下的目标回波信号模型;其次,在考虑信道互易性和多脉冲相参积累的条件下,给出了信号处理流程并推导了相应的似然比检测器;最后,对其检测性能进行了仿真,并与其他MIMO雷达和相控阵雷达进行了性能比较.结果表明:天线分置导致的波束展宽带来的相参积累时间的延长,以及天线收发共用导致的信道互易性,都可提高MIMO雷达的检测性能,在天线数不大于6且检测概率大于0.5的条件下,其检测性能明显优于相控阵雷达.

A new multiple-input multiple-output（MIMO）radar model was proposed and the detection performance was discussed in detail.Firstly,the observation geometry of MIMO radar was established,and the signal representation of target echoes under certain searching coverage and searching period was given accordingly.Secondly,the signal processing flow was presented and the corresponding likelihood ratio detector was derived with respect to channel reciprocity and multiple pulse coherent accumulation.Finally,the detection performance was analyzed and compared to other MIMO radar and phased array radar.Simulation results show that either the increase of coherent processing time or the channel reciprocity,due to the antenna separation and its beam broadening and the transceiver antenna sharing respectively,can improve the detection performance of MIMO radar.Especially,in the case that the number of antennas is less than 6 and the probability of detection is higher than0.5,the detection performance of proposed MIMO radar is better than that of phased array radar.