基于最小二乘的对数周期阵列天线可变相位中心计算

Variable Phase Center Calculation of Log Periodic Array Antenna Based on Least Square Method

针对对数周期阵列天线波束合成中的相位中心问题,提出基于最小二乘的可变相位中心计算方法,分别计算俯仰面和方位面的相位中心,天线的相位中心取二者的平均值可得到较为理想的结果;根据计算得到的相位中心,采用基于正弦插值基函数的矩量法对对数周期阵列天线波束合成特性进行了仿真分析,结果表明固定长度电缆加移相器移相,插损大,移相量与相位中心的变化同步难以实现,数字移相方法可以较准确地实现同相合成,是较为可取的方法。

To address the problem of phase center in the beamforming of log periodic array antenna,a variable phase center calculation method based on least square is proposed.The phase centers of elevation plane and azimuth plane are calculated respectively,and the ideal results can be obtained by taking the average value of the two.According to the calculated phase center,the method of moment(MOM)based on sine interpolation basis function is used to simulate and analyze the beamforming characteristics of log periodic array antenna.The results show that the fixed length cable with phase shifter has large insertion loss,and it is difficult to realize the synchronization of phase shift and phase center.The digital phase shifting method can realize the in-phase synthesis more accurately,which is a preferable method.