说明：  在计算雷达损失时，只有当目标位于天线的垂直轴线时才能得到最大天线增益，本程序给出天线辐射方向图，在不同辐射角度下天线增益情况。
(In the calculation of the radar losses when, and only when the destination is located in a vertical axis of the antenna to obtain the maximum antenna gain, the procedures given in the antenna radiation pattern, the antenna gain in the different radiation angles.)