无衍射光电子标靶及误差分析

摘要

提出了一种新型的用于盾构机导向的无衍射光电子标靶,利用映射关系将全站仪激光入射到标靶中CCD上的光斑场盾中心位置和全站仪的角度值联系起来,结合电子水平仪读数,得到标靶的完整姿态角,并计算盾首中心坐标.分析测量过程中全站仪,标靶各部件引起的误差,推导标靶测量姿态角及盾首中心坐标的误差.分析表明,标靶测量盾首的偏差精度达到毫米级,满足盾构导向的精度要求.%A new electronic target based on the principle of the non-diffracting beam is proposed for guidance of shield machine. The spot center location of the incident laser of the total station in CCD fixed in the electronic target and the angle data of the total station are combined by constituting mapping database. The actual attitude angles of the electronic target and the center of the head of shield machine are computed by mapping database and the angles of electronic gradienter. The errors of the total station and components of the electronic target in measuring process are analyzed. The errors of attitude angles and the center of the head of shield machine are derived. The result shows that the measuring precision of the head of shield machine by the electronic target could reach a millimeter-level, which could meet the requirement of the shield machine guidance precision.