摘要
为了研究和监测城市地表的不均匀沉降或三维变形 ,在宁波市建立了GPS三维变形基准网和监测网。在GPS观测中采取了一定的措施 ,以获得高精度的三维坐标分量。顾及到对流层延迟的影响 ,采用Saastamoinen模型改正对流层延迟的干分量部分 ,用分段线性方法来估计对流层的湿分量变化。基线解算采用了高精度的解算软件Bernese ,网平差使用了PowerADJ科研版。实际算例表明 ,采用GPS技术进行城市地表三维变形监测 ,获得了毫米级的精度 ,能够满足城市三维变形监测的精度要求。
A GPS 3\|D deformation fiducial network and a monitoring one are established for studying and observing the asymmetric subsidence or urban ground 3\|D deformation in Ningbo city and some measures taken during GPS observation to ensure high precise 3\|D coordinate components.Considering the affect of troposphere delay,Saastamoinen model is adopted in data processing of the dry component part of that and the wet component change estimated by piece wise linear method.Bernese software is used to resolve the baselines and network adjustment carried out with PowerADJ software.The case study indicates that the mm level measuring precision can be achieved satisfactorily when 3\|D deformation of the urban ground monitored by GPS surveying.
出处
《工程勘察》
CSCD
北大核心
2004年第1期45-50,共6页
Geotechnical Investigation & Surveying
基金
国土资源部科技基金资助项目 (2 0 0 0 1 0 2 0 30 4 )
