MIMO下视阵列SAR线阵天线构型设计

针对收发分置的MIMO模式阵列天线物理设计时,一个等效阵列可由多种物理收发阵列实现的病态问题,从测绘角度切入,依据等效相位中心原理,分析了ARTINO系统不同收发组合的优缺点。引入测绘应用关心的波段、分辨率、高程精度及工作高度等要求,优化设计了真实测绘航空平台的MIMO下视阵列SAR线阵阵元的数目和位置矢量。根据该配置进行了仿真实验,通过三维成像结果和原始仿真场景的差分对比,高程重建误差均值和标准差,以及整个场景和单独建筑物区域误差在半分辨率之内的概率值,证明了优化阵列配置的合理性和有效性。

Linear Array Antenna Configuration Design of MIMO Downward-Looking Array SAR

For the ill-posed problem that an equivalent array can be implemented by a variety of physical transceiver arrays when physically designing bistatic MIMO array antennas,the advantages and disadvantages of different transceiver combinations for ARTINO system were analyzed from the perspective of surveying and mapping.Wave band,resolution,elevation precision and working height concerned by mapping applications were introduced,and array numbers and position vectors of MIMO downward-looking array SAR for real aerial mapping platform were optimized.The simulation results proved the rationality and effectiveness of the optimized array configuration by the differences of three-dimensional imaging results and the original simulation scene,elevation reconstruction error mean and standard deviation,and the probability of reconstruction error within half a resolution about the whole scene and single building area.