Boresight error slope ( BSES) is defined as the ratio of angle shift to the tracing angle of the antenna. 瞄准误差随扫描角的变化率称为瞄准误差斜率。
Beam deflection produces boresight error ( BSE) which is defined as angle shift between viewing direction and true direction. 波束偏移的主要后果是产生瞄准误差,使目标的视在位置与真实位置有一个角度差,这个角度差就是天线罩的瞄准误差。