基于波束扫描的DBF天线方向图测试方法

摘要

The problem of inspection and measurement of DBF antenna performance is studied.Mechanical scanning is hard to be implemented after DBF antenna has been installed on vehicle.The beam of DBF antenna can be scanned electronically towards different azimuth angles,based on which a new mearsurement method of obtaining DBF antenna pattern indirectly is proposed.The relative measurement errors in beam width,sidelobe level,and beam directivity are analyzed afterwards.Simulations are carried out both in normal condition and abnormal condition.The results are the same as those measured by conventional spinning measurement method.The relative measurement errors in beam width,sidelobe level,and beam directivity are small.The simulation results show the effectiveness of this method.%DBF天线安装后,一般不具备可机械旋转的常规测试条件.研究DBF天线方向图的间接测试问题,提出一种基于波束扫描的测试方法,给出其测试原理和测试流程.针对波束宽度、副瓣水平和波束指向等天线主要参数,用仿真比对该方法与常规方法的测试结果和误差.在DBF天线方向图正常和异常两种情况下,两种方法可得到相近的仿真测试结果,证明间接测试方法的有效性.