观测时长对不同长度的GNSS基线解算精度影响分析

Analysis on the Influence of Observation Time on the Accuracy of GNSS Baseline with Different Lengths

观测时长与基线长度是影响GNSS(global navigation satellite system)基线解算精度的重要因素。定量分析观测时长对不同长度的GNSS基线解算精度的影响,是不同应用场景下解算时长设置和基线选择的前提。选取不同基线长度的若干IGS(international GNSS service)站,根据不同观测时长利用GAMIT软件进行静态解算,分析结果表明,对于不同长度的基线,解算精度达到毫米级所需时间不同。对于1 000 km长度的基线,观测时长需要24 h;对于50 km长度的基线,观测时长需要10 h;而对于5 km的基线,4 h的观测时长即可达到优于10 mm的精度。

Observation time and baseline length are important factors affecting the accuracy of GNSS baseline calculation.Quantitative analysis of the influence of observation time on the accuracy of GNSS baseline solution of different lengths is the premise for setting the solution time and selecting the baseline under different application scenarios.A number of IGS stations with different baseline lengths are selected,and the static calculation is carried out by GAMIT software according to different observation time.The analysis results show that for baselines with different lengths,the time required for the calculation accuracy to reach the millimeter level is different.For a baseline with a length of 1 000 km,the observation time is 24 hours.For a 50 km long baseline,the observation time needs 10 hours.For a baseline of 5 km,the observation time of 4 hours can reach an accuracy greater than 10 mm.