摘要
城市GNSS控制网升级改造过程中,由于观测间隔中点位可能发生变动,导致不同期数据的兼容性和解算控制点成果的一致性较差。针对该问题,研究了CGCS2000框架下多期GNSS网观测数据联合处理的方法,通过比较不同期观测数据中存在的重复基线来确定点位变动情况,进而解决多期数据的兼容性问题。以昆明市城市首级GNSS控制网间隔8年的两期观测为例进行试验,结果表明,笔者提出的方法能确认变动点位并更新坐标,保证了多期联合平差的可靠性,获得了与原有成果较为一致的结果。
During the update of the urban GNSS control net- work, the change of observations interval middle-point posi- tion may cause weak compatibility and poor consistency of the data obtained in different periods in calculating coordinate results. In order to solve this problem, this paper studies the method of combined treatment of multi-period GNSS net- work observation data under the framework of CGCS2000. By comparing observation data of repeated baseline existed in different periods, point position variation is estimated, thus achieving the compatibility of multi-period data. This meth- od is tested by processing data observed in two different peri- ods that are separated by an eight-year interval for the prima- ry GNSS control network of Kunming city. Results show that the method proposed in this paper confirms the changes and updates the coordinates of points, ensuring the reliability of the multi-period combined adjustment, acquiring the consistence between the results by this study and those of previous work.
出处
《测绘地理信息》
2017年第4期65-68,共4页
Journal of Geomatics
