Element Failure Correction for a Large Monopulse Phased Array Antenna With Active Amplitude Weighting
Element Failure Correction for a Large Monopulse Phased Array Antenna With Active Amplitude Weighting
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DOI：
10.1109/tap.2007.902008
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发表时间：
2007-08
影响因子：
5.7
通讯作者：
W. Keizer
中科院分区：
文献类型：
--
作者：
W. Keizer
最近引入了一种新方法来合成具有周期性元件排列的平面阵列天线的低旁瓣方向图。该方法利用了对于单元具有周期性间隔的平面阵列，阵列因子与单元激励之间存在傅里叶逆变换关系的性质。该属性以迭代方式用于从指定的阵列因子导出阵列单元激励。同样的方法还能够部分补偿旁瓣的退化并获得由于元件故障而导致的阵列方向图的性能。针对 5800 元件圆形阵列的超低旁瓣和和差模式，给出了使用该方法进行阵列故障校正的数值示例，其中故障元件随机分散在孔径上。该阵列中的锥度专门由使用可变增益控制的发射/接收 (T/R) 模块中的主动加权创建。
Recently a new method is introduced to synthesize low sidelobe patterns for planar array antennas with a periodic element arrangement. The method makes use of the property that for a planar array with periodic spacing of the elements, an inverse Fourier transform relationship exists between the array factor and the element excitations. This property is used in an iterative way to derive the array element excitations from the prescribed array factor. The same method is also able to partially compensate the degradation of the sidelobe and gain performance of array patterns due to element failures. Numerical examples of array-failure correction using this method are given for ultralow sidelobe sum and difference patterns of a 5800-element circular array where the failed elements are randomly dispersed across the aperture. The tapers in this array are created exclusively by active weighting in the transmit/receive (T/R) modules using variable gain control.