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文中针对MIMO分布孔径雷达目标检测问题建立了目标回波的经典线性模型,并基于此模型研究了Gauss色噪声以及各观测通道间目标RCS部分相关等复杂情况下MIMO雷达检测器的构造思路与检测性能.构造思路的研究结果表明,MIMO雷达检测器所必须完成的杂波抑制、匹配滤波等任务都可以在各个接收孔径上分别独立地完成,从而降低了检测器的实现难度.基于这种构造思路,文中给出了适用于强噪声背景或飞行器隐身技术致使某些观测通道失效条件下的Max检测器,该检测器还具有恒虚警率门限容易计算的优点.检测性能分析方面,文中首先利用Fishler偏差系数和极限统计量等价分解形式从理论上分析了MIMO分布孔径雷达AMF检测器的检测性能,然后推导了该检测器的检测性能解析表达式.理论分析与仿真计算的结果都表明,噪声背景的有色性以及观测通道间的相关性都会降低MIMO分布孔径雷达的空间分集能力,使观测通道间目标RCS的变化由快起伏趋向慢起伏,从而导致MIMO分布孔径雷达的检测性能在大信噪比时向相控阵雷达退化.
Aiming at the problem of target detection in MIMO distributed aperture radar, a classical linear model of target echo is established. Based on this model, the construction and detection of MIMO radar detector under complex conditions such as Gaussian color noises and correlation of target RCS between observation channels are studied. The research results show that the tasks such as clutter suppression and matched filter, which must be completed by the MIMO radar detector, can be completed independently on each receiving aperture, which reduces the difficulty of the detector. Based on this structure The paper gives the Max detector which is suitable for the strong noise background or the stealth technology of the aircraft to cause the failure of some observation channels.The detector also has the advantage of easy calculation of constant false alarm rate threshold.As for the detection performance analysis, The detection performance of AMF detector for MIMO distributed aperture radar is theoretically analyzed by Fishler coefficient of bias and the equivalent decomposition of limit statistic, and then the analytic expression of detection performance of the detector is deduced.The theoretical analysis and simulation results show that , The color of the noise background, and the correlation between the observed channels reduce the MIM O space-borne radar, the spatial diversity ability of target distributed aperture radar changes the change of target RCS between observation channels from rapid fluctuation to slow fluctuation, which leads to the degradation of the detection performance of MIMO distributed aperture radar to the phased array radar at large signal-to-noise ratio.