相控平面阵机载预警雷达对天线旁瓣电平的要求

On the requirements of antenna sidelobe level for airborne early warning phased array radar

天线旁瓣电平的要求与脉冲重复频率的选择在机载预警（ＡｉｒｂｏｒｎｅＥａｒｌｙＷａｒｎｉｎｇ──ＡＥＷ）雷达系统设计中十分重要，这方面已有不少工作［１，２］．然而，对于平面相控阵，采用可分离加权时，存在主平面旁瓣和非主平面旁瓣，前者一般比后者大４０ｄＢ以上（收发双程），使得远程杂波仍很强．研究表明，与传统观点相反，采用多重中重复频率体制，并不能降低传统空时级联ＡＥＷ雷达天线旁瓣电平的要求．

The determination of antenna sidelobe level requirements and the choice of pulse repetition frequency (PRF) are very important in the design of airborne early warning radar systems, which have been discussed by several authors in Ref.[1], [2]. However, for planar phased arrays taking separable weight settings, the assumption about the beam patterns unsed in Ref.[1],[2] is violated and the conclusions drawn from antenna patterns with equal sidelobes are on longer valid in this case. Both theoretical analysis and numerical simulation results provided in this paper show that, contrary to the results given in Ref.[1],[2], the sidelobe level requirements for AEW radars can not be lowered down by using multiple medium PRF.