分集MIMO雷达目标回波相关性分析

Analysis of echo correlation in diversity MIMO radars

针对目标回波的相关性问题,现有模型仅考虑空间和频率间隔的作用,忽略了目标姿态等其他因素的影响.基于以上问题,提出利用直四棱柱散射模型以便更真实地模拟雷达目标;推导出空间和频率分集多输入多输出雷达系统中目标回波相关系数由各雷达站观测角度、目标尺寸、空间和频率间隔等因素共同决定.着重分析了雷达相对目标在不同观测方向时目标的有效孔径随目标空间尺寸和观测角度变化,从而对回波相关系数产生影响.

For the target echo correlation,the existing target model has a huge limitation which just represents the angle or frequency interval with respect to the station,but ignores the influence of target attitude.To solve this problem,this paper utilizes the four straight prism scattering model to better simulate the true target,and the research shows that the correlation coefficient is affected by the observed direction,target size,spatial and frequency interval at the same time in the diversity MIMO radar.The study focuses on the variation of the target＇s effective size with the observed direction and spatial size in the case that the radars stay at different positions,which influences the correlation coefficient severely.