由GPS基线向量解算地面形变

通常采用比较各期坐标变化的方法来分析全球定位系统(GPS)形变网的数据．提出一种整体平差模型，将各期GPS基线向量放在一起平差，定义各点在任意时刻的坐标为其在参考时刻的坐标和形变速度与形变时间的乘积之和．为了更具直观性、更容易加上先验已知信息，将空间坐标参数转换为平面坐标和大地高参数，将空间坐标形变速度转换为水平位移和沉降速度参数．整体平差同时计算出参考时刻的站坐标和形变速度，还推导了相应的协方差矩阵，算例表明模型正确。

Application of GPS Technique on Surface Deformation Monitoring

Usually the deformation velocities are determined by the comparison of coordinate changes among different epochs.In this paper, a whole adjustment model is introduced in processing GPS deformation monitor- ing network.Baselines of all epochs are adjusted together.The coordinates of each point are divided to coordi- nates at reference time and multiplication of deformation velocity and duration interval.To be more clearly the space coordinate parameters are replaced by plan coordinate and ellipsoid height,and the space deformation ve- locities are replaced by horizontal and vertical deformation velocities.The coordinates of each station at refer- ence epoch are calculated simultaneously with deformation velocities.The variance and co-variance matrix is deduced also.The example shows the model works well.