地下工程直伸支导线陀螺定向精度分析研究

在长隧道地下导线测量中,采用测角量边,单一支导线测量精度较低.通过对陀螺定向的研究,讨论了通过横向贯通误差确定陀螺定向边的个数,分析了直伸型导线测量中加测陀螺方位角的数量及其增益.结果意味着较低精度的陀螺测量与较高精度的角度观测产生同样的点位误差.研究说明陀螺经纬仪的使用,可以减少地下导线测量的误差传播.

Accuracy Analysis of Gyroscopic Orientation in Underground Straight Open Traverse

To guide the underground traverses of long tunnels,the angle and the border length was adopted to control the location of single open traverse,such a method led to a lower control accuracy.The gyroscopic orientation in the underground open traverse was studied.The quantity gyro-azimuth with the lateral breakthrough error was investigated.The number and its benefit increments of adding the gyroscopic azimuth angle in the surveying underground straight open traverse were analyzed.It means that much less accurate gyro measurements gave the same positional accuracy as the angles measurements of much more precise.Study proves that use of gyroscopic theodolite can decrease the error propagation in the underground traverses survey.