大型桥梁自动变形监测中全站仪动态基准误差传递的分析

Measuring error caused by movement of benchmark for auto total station in deformation monitoring for large bridges

针对将全站仪站点布设在桥梁变形体上的自动变形监测导致的测量精度下降问题,提出了动态基准观测的新方法.在稳定点布设一台全站仪站点,在桥梁变形体上布设另一台全站仪站点(称为动态基准).当动态基准处全站仪对变形点进行变形观测时,稳定点处全站仪跟踪动态基准处全站仪,获取动态基准点的坐标变化;并将这一坐标变化折合成动态基准误差用来改正被测点的坐标.采用Leica TC405(精度:5±(2 mm+2 ppm))对动态基准观测方法进行了观测模拟实验.实验结果证明:动态基准观测方法正确可行,观测点坐标的中误差在5 mm以内;该方法可用于大型桥梁的自动变形观测.

To decrease the measuring error caused by movement of benchmark for auto total station in deformation monitoring for large bridges,a mathematics model of the error is set up based on the measuring principle of total station.The measuring error caused by the movement of benchmark is analyzed.A compensation method to correct the coordinate of deformation points is proposed after establishing the relationship between coordinate change of benchmark and the error.Furthermore,an observation simulation experiment ...