A radar beam picks out the moving target and stays with it all the time. 雷达波束能辨认出活动的目标，并一直跟踪该目标。
The bandwidth of the instantaneous wideband phased array radar is limited by the aperture overlay time, and will cause the direction of the beam changed. 瞬时宽带相控阵雷达的带宽受孔径渡越时间的限制，会造成雷达波束指向的变化。
