观测时间对基线解算质量和GPS网精度的影响分析

Impact Analysis of Observation Time on Baseline Solution Result and GPS Positioning Accuracy

在不同的观测时段,卫星的几何分布情况及其运动轨迹并不一样,这直接导致各时段内所获得的基线解算质量和GPS定位精度也有区别。采用LGO软件进行基线向量解算和网平差,并通过复测基线长度较差、异步环闭合差、点位中误差、GPS基线向量残差4项指标来比较不同观测时间长度下的基线解算质量和定位精度。结果表明,观测时间在1 h左右就可以获得较高的精度。在选择较好的观测时段后,在满足测量精度的前提下,适当缩短观测时间是可行的,这对于在工程测量中提高工作效率具有一定的指导意义。

The satellites＇ geometric distribution and trajectory are not the same in different observation periods, which leads directly to that the baseline solution quality and GPS position- ing accuracy are quite different in each period. In this paper, we use LGO software to do the baseline solution and GPS net- work adjustment, and then compare the baseline solution result and GPS network accuracy in different observation time via the following four indicators： the length difference of retest base- lines, asynchronous loop closure, mean square error of position and GPS baseline vector residuals. We find that we can obtain a relatively higher precision when we control the observation time in about one hour. It can be concluded that when we choose a good observation period, it＇ s feasible to shorten the observation time moderately on the premise of meeting the mea- surement accuracy requirements, it＇s constructive to improve efficiency in engineering survey.