双参考站单频相位实时精密监测技术

摘要

A single frequency carrier phase positioning approach based on two GNSS reference stations is suggested through analyzing the real-time precision monitoring problem for some large building structures under different loads.Namely,two baselines are constructed to measure the instantaneous displacement of the monitoring station through processing single fre-quency phase and code observations from two fixed reference stations and one monitoring station.This technique facilitates to extract the displacement monitoring information from the estimated instantaneous position,and ensures to achieve that of in-stantaneity,reliability and precision of the monitoring result.Some preliminary tests were implemented in the bridge construc-tion survey and deformation monitoring system.These tests presented that the new algorithm no longer required an initialization process for fixing phase ambiguity reliably,and could achieve higher positioning accuracy than that of single reference station system.Multi-test results also presented that horizontal positioning with mm to cm accuracy could be achieved with only one ep-och observables.%针对大型构筑物在各种荷载下的动态响应实时精密监测问题，提出了一种基于全球导航卫星系统双参考站单频载波相位实时精密定位的技术，即采用双参考站与单频观测的监测点组成双基线实时精密监测位置变化。该技术能克服单参考站精密定位技术的一些不足，确保了监测结果的可靠性、实时性和精度。在桥梁施工测量和形变监测中的一些初步试验显示：无需初始化即能可靠固定单历元单频相位模糊度，定位精度获得了提高，实现单历元平面位置定位精度 mm 级水平。