用线性系统理论分析相控阵天线

A Study of Phased Array Antenna on the Basis of the Linear System Theory

相控阵天线是一离散阵,它的波束控制采用了数字移相器。因所用的字长有限,必然对天线的性能有影响。本文用线性系统中的采样定理导出了阵元间距的约束条件,用付氏变换理论,计算出在有限字长时,对天线性能的影响,并在空间馈电的情形下,导出了方向图锐化等效于时域中脉冲压缩。

The phased array antenna is a discrete array, the beam of which is steered by the digital shifter. The antenna performance is influenced by the limited wordlength. In this paper, the element spacing constraint is deduced by sampling theorem in the linear system theory. It is concluded that the pattern sharpening is equivalent to the pulse compression in the time domain under the space-fed condition.