【摘要】 选择苏通大桥首级GPS控制网桥轴线附近的几条跨江基线为研究对象,分析基线精度随观测时间的变化情况。将连续24 h观测数据按1 h间隔累积并进行基线解算,认为基线精度并不会随观测时间的过多增加而有明显提高。将24 h观测数据分别按4、6、8 h进行分段基线解算和分析,认为选择较好的观测时段和较短的观测时间,同样可以达到连续24 h观测的效果。研究观测时间的选择对基线精度的影响,对合理安排GPS网复测和提高工作效率有一定的借鉴意义。更多还原

【Abstract】 Selected several crossing-river baselines beside bridge axis of GPS network of Su-Tong large bridge,the baseline accuracy varying with observation time is analyzed.The continuously observed data for twenty four hours is accumulated at intervals of one hour,It is found out that the baseline accuracy isn’t obviously raised with the increase of superabundant observation time.The data observed for twenty four hours is segmently calculated and analyzed for four,six and eight hours respectively,which indicated that better and shorter observation time selected can achieve similar result as that from continuously observation for twenty four hours.The influence of the selection of observation time on baseline accuracy is studied,for appropriate arrangement for repetition measurement GPS network and raising work efficiency.更多还原