摘要
提出了用GPS定位技术进行变形监测的一种新方法及模型 ,利用在变形监测点和基准点上实测的载波相位观测值组成双差观测值 (含双差整周模糊度 ) ,用变形监测点和基准点较精确的先验位置及卫星位置来计算另一个双差值 ,从基准点和变形监测点的双差观测值的变异中直接提取出变形矢量。如果变形量很小 ,对双差观测值的影响远小于 1周 ,则在数据处理时可绕开“周跳的探测与修复”及“整周模糊度的确定”等问题 ,使数据处理大为简化。用测试软件对实际观测资料进行了处理 ,计算结果表明本方法的原理及数学模型是正确的。初步结果表明其平面位置精度能达到 2～ 3mm ,高程方向精度为 3～ 4mm。
In this paper,a new algorithm for high accuracy deformation monitor with GPS is proposed.Double difference observations Δφ′ 0 are formed using the carrier phase observations at monitor point and reference station.The calculated double difference observations Δφ c are derived from the prior known position of the monitor point and reference station,then the deformation vector δ can be derived from the difference between Δφ c and Δφ′ 0 if the deformation value is very small,and its effect on δΔφ is far less than half one cycle.Cycle slip detection and repair and ambiguity resolution can be avoided in the data process using the proposed method.The data processing procedure can be simplified greatly.The performance of the proposed method has been tested using data from a baseline within about 1 km.The preliminary result indicates that the new algorithm and the mathematic models are correct,and shows that the deformation estimates are at the accuracy of several millimeters with two hours data.A software package was developed to implement the proposed methodology.
出处
《武汉大学学报（信息科学版）》
EI
CSCD
北大核心
2001年第5期451-454,共4页
Geomatics and Information Science of Wuhan University
基金
国土资源部科技基金资助项目 ( 2 0 0 0 10 2 0 30 4)
