BEAM BROADENING SYNTHESIS FOR SAR ANTENNA ARRAY BASED ON PROJECTION MATRIX ALGORITHM

A new beam broadening synthesis technique for Synthetic Aperture Radar(SAR) antenna array, namely Projection Matrix Algorithm(PMA) is presented. The theory of PMA is introduced firstly, and then the iterative renewed manner is improved to resolve the unbalance problem under amplitude and phase control. In order to validate the algorithm correct and effective, an actual engineering application example is investigated. The beam synthesis results of 1.0~4.5 times broadening under the phase only control and the amplitude and phase control using improved PMA are given. The results show that the beam directivity, the beam broadening, and the side-lobe level requirements were met. It is demonstrated that the improved PMA was effective and feasible for SAR application.

基于FFT和共轭梯度法的近场诊断方法

介绍了一种相控阵天线口径场诊断方法,本方法基于等效磁流法,通过引入矩量法建立近场测量数据域天线口径场分布的矩阵方程,再应用共轭梯度法求解该矩阵方程以获得相控阵天线的口径场分布,达到对口径场进行诊断的目的。同时引入探头补偿技术,利用探头平方根法,消除了探头对测量数据的影响。选取平面阵列进行数值仿真验证了该方法的正确性,并在微波暗室中对某相控阵天线进行了诊断试验,证明了该方法的有效性与实用性。