摘要
虚拟参考站技术是近几年发展起来的,集Internet、无线通讯、计算机网络和GPS于一体的卫星定位技术。成都虚拟参考站卫星定位服务系统的建设,在设计上可满足全天候地向大成都地区用户提供厘米级实时动态定位服务。为了对该系统的实际定位精度进行客观的评价,从2 0 0 4年7月开展,历时两个月,全面完成了成都虚拟参考站卫星定位服务系统的精度评定工作,结果表明:在网内,水平方向上的精度可达2 .5cm ,垂直方向上的精度为4 . 5cm ,精度分布均匀;在网外,未模型化的距离相关误差的残余逐步增大,特别是距离网络中心大于1 2 0km以上时,定位精度开始衰减,为分米级。
Multiple reference station networks have been established for high precision applications in many countries worldwide.However,real-time application is still a difficult task in practice.The virtual reference station (VRS) is an efficient method for the network users to perform RTK positioning.With the availability of GPRS or CDMA technology,an Internet-based VRS RTK positioning infrastructure has been developed and tested.This paper discusses the construction of GPS/VRS positioning system in Chengdu,China,which has been designed to offer centimeters magnitude service for potential public users located within the coverage.To make sure that the users within the reference station network can operate consistently at greater distances without degrading accuracy and to provide a reliable real-time kinematic positioning,field tests are presented to evaluate the performance of the system.The results demonstrate that Internet-based VRS RTK positioning can be achieved to better than 2.5 centimeters in horizontal position,and the height accuracy is in the range of 1 to 4.5 centimeters within the network.Distance-dependent errors,e.g.the ionospheric and troposhpheric delay errors,cannot been modeled effectively when rover receiver goes outside the reference-station-network coverage,especially for 120km or further from the network center,and the positioning accuracy degrade to decimeters.
出处
《测绘科学》
CAS
CSCD
北大核心
2005年第3期75-77,共3页
Science of Surveying and Mapping
基金
四川省"十五"重点科学工程项目"四川数字地震观测网络建设工程"
国家自然科学基金 (No :4 0 2 71 0 91 )
关键词
全球定位系统
虚拟参考站
实时动态定位
精度评定
global positioning system
virtual reference station (VRS)
real-time kinematic positioning (RTK)
accuracy evaluation
