经纬仪前方交会 meaning in English

theodolite intersection

The chief principle is based on the front intersection measurement aided by two electric theodolite . the laser emitter casts light , spots on the antenna surface and gets the 3d coordinates of the sample data . then , the surface precision of the antenna can be obtained by corresponding data processing
雷达天线检测原理是由激光目标发生器投射光点，两台电子经纬仪前方交会测量，得到采样点的三维坐标值，再进行相应的数据处理，最终对天线面的变形情况和蒙皮表面加工误差作出评价。