Research On BDS Precise Orbit Determination And Application

Satellite navigation and space location service play an increasingly important role in military,transformation,ADAS,and daily life.China's Beidou satellite navigation system(BDS-2),which has been independently constructed and operated in China,already has high-precision PVT service capabilities in the Asia-Pacific region.Satellite precision orbit is the basis for realizing high-precision spatial location services.In response to the determination of BDS's precision orbit determination,the BDS single and multi-GNSS integrated orbit determination methods were studied to improve orbital accuracy.The BDS system and multi-GNSS integrated precision single point positioning technology are used to analyze BDS's high-precision space service capabilities.The experimental results have certain reference value for the precise orbit determination and space service capabilities of the BDS satellite navigation system.The main research content is as follows:1.This article,we discussed the basic of data processing,and described the BDS observation data pre-processing methods.By using the multi-GNSS data quality check software,the MGEX observation data is processed.We eliminated with the complete rate of BDS data less than 80%,and the observation station naework is optimized.The experimental results show that the removal of some stations can impeove the orbit accuracy of BDS.2.This article also studied the theory and method of BDS zero-differential precise orbit determination.We conducted the BDS single-system precise orbit determination experiment.Lack of satellites and insufficient geometric configuration lead to poor orbit determination accuracy and limit application.The accuracy of the BDS orbit is better than 12cm in radial direction,the track direction is better than 25cm,and the normal direction is better than 88cm in 1-day arc.In the 3-day overlapping arc,the track accuracy is stable,the radial RMS is better than 20cm,and the track and normal RMS is better than 80cm.3.The key technologies for multiple precise orbit determination are given,and precise orbit determination experiments are performed based on the global MGEX observation data.The results show that the addition of navigation systems can improve the observation geometry and the orbit accuracy.Long arc can also improve the orbit accuracy.The accuracy the BDS orbit of 1 day arc is better than 10cm in radial direction,better than 20cm in track direction,and better than 80cm in normal direction.In the 3-day overlap arc,the track accuracy is stable,the radial direction is better than 11cm,the track direction is better than 23cm,and the normal direction is better than 70cm.4.A variety of modes of PPP static experiments were performed,by using precise orbits and clock products and high-precision positioning software.The results show that the RMS in the east,north,and up directions is better than 1.8cm using the BDS single-system PPP.However,the RMS values in the east,north,and up directions are all better than 1cm using the multisystem fusion precision positioning solution.This shows that increasing the number of visible satellites can shorten the positioning convergence time and improve the stability of the solution.