天线测量中,一般均采用方位一俯仰型(方位转盘位于俯仰轴上)转台.或俯仰一方位型(俯仰轴位于方位转盘之上)转台。目前仍以使用后者的居多.这种转台当发射端和接收端不处于同一高度因而使得波束轴与方位旋转平面不平行时,则在波束宽度,付瓣电平上带来误差.对于非圆对称波束.会带来付瓣更严重的误差.本文讨论这一问题的目的,在于给出一个明确的数量限制以使测量结果达到足够的精度. Generally, the azimuth-pitching type (the azimuth dial is located on the pitch axis) turntable or the azimuth-pitch type (the pitch axis is located on the azimuth dial) are generally used in the antenna measurement. At present, the majority of the latter are still used. When the transmitting end and the receiving end are not at the same height and thus the beam axis is not parallel to the azimuthal rotation plane, errors are caused in the beam width and the level of the petals. The circularly symmetric beam will bring more serious error of the petals.The purpose of this paper to discuss this issue is to give a definite quantitative limit to make the measurement result with enough precision.