近场雷达成像非均匀稀疏阵设计

Non-uniform sparse array design in near field radar imaging

阵列设计作为多输入多输出(MIMO)雷达成像系统中的一项关键技术直接影响系统成像性能。为了解决阵元数目、结构与成像质量的关系问题,研究了近场MIMO收发稀疏阵的点扩展函数,研究了合成阵列中栅瓣的位置,探讨了基于等效阵列概念的MIMO阵列设计方法,优化了基于远场条件设计的稀疏阵,并讨论了近场效应对成像结果的影响。仿真结果表明:优化后的阵列在120~150 GHz栅瓣水平可以抑制到-50 dB。

In Multiple-Input Multiple-Output(MIMO)radar imaging systems,the configuration of antenna array,as one of the key techniques,has great effects on image quality.Based on the imaging model of MIMO radar,in order to compromise the number of antennas and the performance of the array,the sparse array design method taking advantage of the equivalent virtual array concept is discussed,and the designed structure of the sparse array based on far field is optimized.Simulation results show that the grading lobes of the proposed array are lower than-50 dB in 120-150 GHz.