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针对人体安检应用中的高分辨率实时成像需求,分析了被动毫米波成像系统中相控阵体制与综合孔径体制的关系,结合两者优势提出了一种协同体制被动毫米波成像系统.针对水平方向相控阵体制布局,利用模拟退火算法进行优化,提出采用不同孔径喇叭天线作为阵列单元的方式提升阵列性能,并对主波束效率最大化及副瓣电平最平坦两种准则下的优化结果进行比较;针对竖直方向综合孔径体制布局,设计了满足基线不缺失条件的冗余度最平均稀疏阵列布局.仿真分析结果表明优化后的阵列天线结构可满足被动成像中提升功率测量信噪比(SNR)的需求.
In order to meet the demand of high-resolution real-time imaging in human security applications, the relationship between phased array system and synthetic aperture system in passive millimeter-wave imaging system is analyzed. Combined with the advantages of both, a collaborative passive millimeter-wave imaging system is proposed. Directional phased array system, the simulated annealing algorithm is used to optimize the performance of the array. It is proposed to use different aperture horn antennas as the array elements to improve the performance of the array and to optimize the main beam efficiency and the flatter side-lobe criterion And the most average sparse array layout of redundancy is designed to meet the requirements of baseline without missing. The simulation results show that the optimized array antenna structure can meet the requirement of improving power measurement of signal to noise ratio in passive imaging (SNR) needs.