近距三维成像稀疏MIMO阵列设计

Design of Sparse MIMO Array for Near-Filed 3D Imaging

针对MIMO阵列雷达在近场条件下的成像应用,围绕稀疏阵列的设计方法展开研究。从雷达近距离成像模型开始,推导了基于后向投影(back projection,BP)成像算法的稀疏MIMO阵列设计数学模型,在此基础上给出了以点扩展函数(point spread function,PSF)为准则的阵列设计方法,同时分析了阵列的旁瓣抑制性能。最后,给出了两种稀疏MIMO阵列,同时进行多目标成像验证。从仿真结果可知,设计的稀疏MIMO阵列能够满足近距三维成像的需求,为下一步的实际应用奠定了基础。

For the imaging application based on the MIMO array in near-field condition,the sparse array design method is researched.Starting from the radar imaging model in near field,the mathematic model of the sparse MIMO array design method based on the back projection(BP)imaging method is deduced,the theoretical expression of the point spread function(PSF)is derived and the suppression performance of side lobe is analyzed.Two sparse array design methods are given for multiple targets imaging verification at the same time.It can be seen from the simulation results that the designed sparse MIMO array can meet the needs of near field imaging and provide a foundation for real application.