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Based on the analyses for the characteristics of high precise GPS defor-mation monitor,according to the spatial relationship among the satellite, base point and monitoring point a new model and its corresponding algorithm were presented to solve the monitoring point deformation directly at single epoch. In this method the carrier phases is used as the basic observations, and the initial condition is precise baseline vectors obtained in the first period observations between the base point and monitoring point. This model is called the similar single difference model (SSDM). The main error sources effecting the accuracy of deformations were analyzed briefly, the single epoch algorithm of the receiver clock offset was advanced. The numerical results of test data show that the SSDM and the single epoch algorithm of receiver clock offset advanced are reliable and correct. 相似文献
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长江中游大地形变GPS监测及精度分析 总被引:3,自引:0,他引:3
为了国土资源调查和防洪防灾,在长江中游建立了 大地形变 GPS监测网,以监测水患区的构造沉降。顾及到对流层延迟的影响,实测了每个测 站处的气象数据。在GPS监测网的数据处理中,采用Saastamoinen 模型来计算对流层延迟的 干分量,而对流层延迟中的湿分量,用分段线性方法进行估计,以提高GPS高程分量的精度 。GPS监测网基线的重复精度优于10-8,GPS监测网的点位水平中误差均优于±2.6 mm,高程均优于±3.3 mm,平差后基线边相对精度优于10-8量级。研究表明, GPS监测网的精度达到并完全满足了大地形变监测的精度要求,可为地质调查和灾害防治提 供准确的垂直变形信息。 相似文献
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采用室外天线测定法,对Topcon,Trimble,Leica等3种类型、5种型号的GPS接收机天线进行了组合实验.用Bemese软件进行数据处理时,计算出了各种组合天线之间的相位中心垂直分量偏差的差值,获得了毫米级的精度.实验表明,同种类型同种型号的GPS接收机天线之间,其相位中心垂直分量偏差的差值在1mm左右甚至小于1mm;而同种类型不同型号或者不同类型的GPS接收机天线之间,其相位中心垂直分量偏差的差值都很大,达到几毫米甚至几厘米,应加以改正,以获得准确可靠的高程分量变形值. 相似文献