基于反正切变换的相控阵天线相位校准方法

初始相位校准是影响相控阵天线工作性能的关键环节之一,为实现无人机微波着陆引导设备对飞行器的精确引导,需要对其相控阵扫描天线各阵元的初始相位误差进行精确估计与补偿.针对这一问题,提出一种相控阵天线初始相位校准方法.该方法在固定角度测量随阵元移相器相移值改变而变化的合成信号功率值,通过反正切变换建立初始相位误差与测得功率值的关系.对曲线拟合法、旋转矢量法以及反正切变换法的仿真及对比分析表明,反正切变换法的相位校准精度优于其他2种方法,并且工作时间缩短,从而验证了反正切变换法的可行性.

Phase calibration method for phased array antenna based on arc-tangent transform

The initial phase calibration is a key part of impacting the phased array antenna performance. To achieve precise guidance of UAV microwave landing device to aircraft, accurate estimation and compensation to initial phase error of each array element of phased array scanning antenna are needed. As for the problem, an initial phase calibration is proposed.The method measures power value of combined signal which changes by following with phase shifter value at a fixed angle,and then builds relationship between initial phase error and power value based on arc-tangent transform. The simulation and comparison to curve fitting method and REV method and arc-tangent transform method show that arc-tangent transform method has more precise phase calibration accuracy and shorter working time than the other two methods, which verifies the feasibility of arc-tangent transform method.