In order to solve the problems that the novel wide area differential method on the satellite clock and ephemeris relative correction(CERC)in the non-geostationary orbit satellite constellation,a virtual reference sate...In order to solve the problems that the novel wide area differential method on the satellite clock and ephemeris relative correction(CERC)in the non-geostationary orbit satellite constellation,a virtual reference satellite(VRS)differential principle using relative correction of satellite ephemeris errors is proposed.It is referred to be as the VRS differential principle,and the elaboration is focused on the construction of pseudo-range errors of VRS.Through qualitative analysis,it can be found that the impact of the satellite’s clock and ephemeris errors on positioning can basically be removed and the users’positioning errors are near zero.Through simulation analysis of the differential performance,it is verified that the differential method is universal in all kinds of satellite navigation systems with geostationary orbit(GEO)constellation,Medium orbit(MEO)constellation or hybrid orbit constellation,and it has insensitivity to abnormal aspects of a satellite ephemeris and clock.Moreover,the real time positioning accuracy of differential users can be maintained within several decimeters after the pseudo-range measurement noise is effectively weakened or eliminated.展开更多
This work aims to obtain a wide area differential method for geostationary orbit(GEO)constellation.A comparison between the dilution of precision(DOP)of four-dimensional(4D)calculation including sa-tellite clock error...This work aims to obtain a wide area differential method for geostationary orbit(GEO)constellation.A comparison between the dilution of precision(DOP)of four-dimensional(4D)calculation including sa-tellite clock errors and ephemeris errors and that of three-dimensional(3D)calculation only including ephemeris errors with the inverse positioning theory of GPS shows the conclusion that all the 3D PDOPs are greatly reduced.Based on this,a basic idea of correcting satellite clock errors and ephem-eris errors apart is put forward,and moreover,a specific method of separation is proposed.Satellite clock errors are separated in a master station with time synchronization,and all the remaining pseu-do-range errors after the satellite clock errors have been deducted are used to work out ephemeris corrections of all GEO satellites.By a comparative analysis of user positioning accuracy before and after differential,the wide area differential method is verified to be quite valid for GEO constellation.展开更多
基金supported by the National Natural Science Foundation of China(Grant No.10778715)the National Key Basic Research Development Program of China(Grant No.2007CB815502)the Scientific Research Fund of Hunan Provincial Education Department(Grant No.08B039)
文摘In order to solve the problems that the novel wide area differential method on the satellite clock and ephemeris relative correction(CERC)in the non-geostationary orbit satellite constellation,a virtual reference satellite(VRS)differential principle using relative correction of satellite ephemeris errors is proposed.It is referred to be as the VRS differential principle,and the elaboration is focused on the construction of pseudo-range errors of VRS.Through qualitative analysis,it can be found that the impact of the satellite’s clock and ephemeris errors on positioning can basically be removed and the users’positioning errors are near zero.Through simulation analysis of the differential performance,it is verified that the differential method is universal in all kinds of satellite navigation systems with geostationary orbit(GEO)constellation,Medium orbit(MEO)constellation or hybrid orbit constellation,and it has insensitivity to abnormal aspects of a satellite ephemeris and clock.Moreover,the real time positioning accuracy of differential users can be maintained within several decimeters after the pseudo-range measurement noise is effectively weakened or eliminated.
基金Supported by the National Natural Science Foundation of China(Grant No.10778715)the National Key Basic Research Development Program of China(Grant No.2007CB815502)the Scientific Research Fund of Hunan Provincial Educa-tion Department(Grant No.08B039)
文摘This work aims to obtain a wide area differential method for geostationary orbit(GEO)constellation.A comparison between the dilution of precision(DOP)of four-dimensional(4D)calculation including sa-tellite clock errors and ephemeris errors and that of three-dimensional(3D)calculation only including ephemeris errors with the inverse positioning theory of GPS shows the conclusion that all the 3D PDOPs are greatly reduced.Based on this,a basic idea of correcting satellite clock errors and ephem-eris errors apart is put forward,and moreover,a specific method of separation is proposed.Satellite clock errors are separated in a master station with time synchronization,and all the remaining pseu-do-range errors after the satellite clock errors have been deducted are used to work out ephemeris corrections of all GEO satellites.By a comparative analysis of user positioning accuracy before and after differential,the wide area differential method is verified to be quite valid for GEO constellation.
