Analysis on GAMIT Long Baseline Solution Accuracy for Different Dual-frequency Combinations of BDS
According to the characteristics of multi-frequency point signal combination and multi-constellation combination of Beidou Navigation Satellite System(BDS),in order to study the accuracy of different dual-frequency combinations supported by Beidou system,GAMIT is used for solution of different dual-frequency combinations of a long baseline composed of continuous 27 d Multi-GNSS Experiment(MGEX)tracking station,and a comparison is conducted between the solution results of BDS-2 B1I-B2I and B1 I-B3I,BDS-3 B1I-B3I,B1I-B2a and B1C-B2a,B1I-B3I of Beidou system and LI-L2 of the Global Positioning System(GPS).The positioning accuracy of Beidou system is evaluated in terms of four aspects including Normalized Root Mean Square Error Value(NRMS),error in baseline length,baseline repetition rate and coordinate difference.The results show that the positioning accuracy of BDS-2 B1I-B3I is better than that of B1I-B2I,the positioning accuracy of BDS-3 B1C-B2a is better than that of B1I-B2a and B1I-B3I,and the solution accuracy of B1I-B3I of Beidou system is equivalent to that of GPS L1-L2.Higher solution accuracy is achieved when using dual-frequency combination B1I-B3I and B1C-B2a of BDS-2 and BDS-3 respectively,which provides a reference for other satellite systems to choose different dual-frequency combinations to improve the relative positioning accuracy.
万方数据
维普
