2000国家GPS大地控制网的数据处理和精度评估

Data processing and accuracy analysis of national 2000' GPS geodetic control network

2000国家GPS大地控制网集合了各类GPS网近10年的观测数据,提供GPS点在全球参考框架下2000.0历元的绝对位置.文中简要介绍GPS数据处理的方法,给出数据处理的精度统计;以部分点的实测速度为基础,建立中国大陆地壳运动速度场;基于GPS测量的动态系统状态,选择序贯卡尔曼滤波的广义测量平差方法,对GPS点做顾及地壳运动的整网平差,并给出整网平差结果的精度统计和外部检核.一系列的手段和措施保证了平差结果的合理性和可靠性.

The original data from a number of GPS campaigns carried out in the last 10 years are aggregated to construct the National 2000' GPS Geodetic Control Network and the positions of 2482 GPS sites at 20000 epoch with respect to International Terrestrial Reference Frame are obtained. In the paper, we introduce the method for processing GPS data, deriving site velocities from GPS data,establishing the crustal motion velocity field of the Chinese continent, and carrying out the network integrated adjustment employing a Kalman filter. The accuracy analysis of GPS daily solutions and final coordinate solutions are presented. A series of technical steps ensure the rationality and reliability of the adjustment result.