一、前言由于大型望远镜要对远距离目标进行扫描和跟踪,因而要求仪器有高的成像质量和高的指向跟踪精度,这就要求望远镜必须有高的刚度。因为刚度不好,会产生主副镜间相对线位移而造成慧差;主副镜间相对倾角会产生像散,从而使像质变坏和产生视差,造成像偏载或像位移,使仪器瞄准轴偏移,直接影响测角定位精度和成像质量。 I. INTRODUCTION As large telescopes need to scan and track long-range targets, they require high imaging quality and high pointing accuracy. Therefore, telescopes must have high rigidity. Because the stiffness is not good, will produce the relative displacement between the primary and secondary mirror resulting in coma; relative tilt between the primary and secondary mirror will produce astigmatism, so that the deterioration of quality and produce parallax, resulting in partial load or image displacement, the instrument aiming Axis offset, a direct impact on angle positioning accuracy and imaging quality.