基于北斗系统的提高桥梁变形监测精度方法研究

Research on Improving Precision of Bridge Deformation Monitoring Based on Beidou System

目的研究RTK相对静态定位技术来提高北斗系统在桥梁变形监测上的测量精度。方法分析北斗导航系统的定位误差来源,对多种消除误差的方法进行对比研究。研究在卫星信号传播过程中的周跳现象,对传统TurboEdit法进行分析,建立一种平均滑动的算法对TurboEdit法进行改进。结果传统方法在测点1 X方向上差值的平均值为1.02 cm,在Y方向上差值的平均值为0.98 cm;在测点2 X方向上差值的平均值为1.14 cm,在Y方向上差值的平均值为1.13 cm.改进后的方法在测点1 X方向上差值的平均值为0.59 cm,在Y方向上差值的平均值为0.59 cm;在测点2 X方向上差值的平均值为0.78 cm,在Y方向上差值的平均值为0.78 cm。结论改进后的算法在监测过程中能使北斗系统测量误差控制在1 cm以内,基本可以满足高精度变形监测的要求。

The Beidou navigation system developed by our country is used in the field of bridge monitoring to get rid of the dependence on the GPS system and to study relative static positioning technology to improve the measurement accuracy of Beidou system in bridge deformation monitoring.The source of positioning error of Beidou navigation system is analyzed.A comparative study of various methods for eliminating errors.The cycle slip phenomenon in the process of satellite signal propagation is studied.The traditional TurboEdit method is analyzed,and an average sliding algorithm is established to improve the TurboEdit method.By analyzing the measured data,the improved algorithm can truly reflect the propagation distance of the signal and accurately detect the position of the cycle slip phenomenon.Taking a bridge as an example,the improved algorithm and the traditional algorithm are compared and analyzed,and examples are monitored.In the conventional method,the average value of the difference in the 1X direction of the measuring point is 1.02 cm,and the average value of the difference in the Y direction is 0.98 cm;the average value of the difference in the 2X direction of the measuring point is 1.14 cm,which is in the Y direction.The average value is 1.13 cm.The improved method has an average value of 0.59 cm in the 1X direction of the measuring point,and an average value of 0.59 cm in the Y direction;the average value of the difference in the 2X direction of the measuring point is 0.78 cm in the Y direction.The average value of the upper difference is 0.78 cm.The improved algorithm can keep the measurement error of Beidou system within 1 cm in the process of application,and the monitoring accuracy can reach millimeter level,which can meet the requirements of high-precision deformation monitoring.Beidou system can be applied to more complex terrain to prepare for the further realization of real-time automatic high-precision monitoring.