Study on Method of Analyzing the Positioning Accuracy of Beidou 2nd Generation Satellite Navigation System

Positioning accuracy of satellite navigation system is subjected to the influence of observation's accuracy and the geometrical configuration.Generally GPS and other similar satellite navigation system using Geometric Dilution of Precision(GDOP) to analyze the positioning accuracy.The beidou 2nd generation satellite navigation system of our country is the mixed constellation navigation system,which is composed of three kinds of satellites.Because the errors of satellites that belong to different categories in different orbits,the observation accuracy of user received is different,so when calculating and analyzing the precise positioning accuracy we must consider this kind of difference.The weighted Geometric Dilution of Precision(WGDOP) is introduced in this paper,Using the simulated observing data,we analyzed the positioning accuracy of the beidou 2nd generation satellite navigation system.The conclusion of exterior checking shows that considering the different observation accuracy when doing precise positioning calculation can further enhance positioning accuracy.