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采用均匀圆形相控阵天线的机载雷达杂波分布随距离变化而变化,各距离单元的杂波不再满足独立同分布的条件,造成统计型空时自适应处理(STAP)器性能下降。基于此,本文建立了均匀圆形天线机载雷达模型,对其杂波分布进行了分析,得出了空间角随阵元数非线性变化的特性造成其杂波距离维分布非均匀的结论。研究了一种均匀圆形天线机载雷达杂波抑制方法,该方法先通过修正的角度-多普勒补偿(MADC)预处理消除在杂波谱中心处的非均匀,再利用基于导数更新(DBU)技术进一步减小在其他方位杂波的非均匀程度。仿真结果表明了该方法的有效性。
The clutter distribution of airborne radar with a uniform circular phased array antenna changes with the distance variation, and the clutter of each distance element no longer satisfies the independent and identically distributed conditions, resulting in a decrease in the performance of the STAP (Space Time Adaptive Processing) . Based on this, a uniform circular antenna airborne radar model is established and its clutter distribution is analyzed. The conclusion is drawn that the spatial dimension varies nonlinearly with the number of elements and the non-uniform clutter distance dimension. A clutter suppression method for airborne radar with uniform circular antenna is studied. This method first removes the non-uniformities at the center of the clutter spectrum by modified angle-Doppler compensation (MADC) preprocessing, ) Technique further reduces the non-uniformity of clutter in other orientations. Simulation results show the effectiveness of the method.