TY - GEN
T1 - Integrated adjustment of LEO and GPS in precision orbit determination
AU - Geng, J. H.
AU - Shi, C.
AU - Zhao, Q. L.
AU - Ge, M. R.
AU - Liu, J. N.
PY - 2008
Y1 - 2008
N2 - At present, usually only the ground stations are used for the precise orbit determination (POD) of GPS satellites. The precise orbits of Low Earth Orbiters (LEO) are determined with GPS orbits and clocks fixed. The integrated adjustment of LEO and GPS for POD that is first reported in (Zhu et al., 2004),which means the orbits of GPS satellites and LEOs are determined simultaneously, is introduced here. At first, the contribution of LEOs to GPS POD is illuminated. On the one hand, the data from 43, 32 and 21 ground stations besides three LEOs are used. In the case of 21 ground stations plus three LEOs, about 5.0 cmaccuracy from IGS final orbit can be achieved with only one day's data. On the other hand, the data from one, two and three LEOs besides 43 stations are employed. It is shown that the improvement can reach 31% when only one LEO is added to 43 ground stations. These achievements are mainly attributed to the strengthened geometry afterLEOsare included. Then, the improvement of LEO orbits in the integrated adjustment is presented. When 43 ground stations are used, the improvement can get to 17% and 32% without accelerometer data for CHAMPand GRACE, respectively. So it is demonstrated that the LEO orbit accuracy is improved simultaneously with the GPS orbits in the integrated adjustment.
AB - At present, usually only the ground stations are used for the precise orbit determination (POD) of GPS satellites. The precise orbits of Low Earth Orbiters (LEO) are determined with GPS orbits and clocks fixed. The integrated adjustment of LEO and GPS for POD that is first reported in (Zhu et al., 2004),which means the orbits of GPS satellites and LEOs are determined simultaneously, is introduced here. At first, the contribution of LEOs to GPS POD is illuminated. On the one hand, the data from 43, 32 and 21 ground stations besides three LEOs are used. In the case of 21 ground stations plus three LEOs, about 5.0 cmaccuracy from IGS final orbit can be achieved with only one day's data. On the other hand, the data from one, two and three LEOs besides 43 stations are employed. It is shown that the improvement can reach 31% when only one LEO is added to 43 ground stations. These achievements are mainly attributed to the strengthened geometry afterLEOsare included. Then, the improvement of LEO orbits in the integrated adjustment is presented. When 43 ground stations are used, the improvement can get to 17% and 32% without accelerometer data for CHAMPand GRACE, respectively. So it is demonstrated that the LEO orbit accuracy is improved simultaneously with the GPS orbits in the integrated adjustment.
KW - GPS
KW - Integrated adjustment
KW - LEO
KW - Precision orbit determination
UR - https://www.scopus.com/pages/publications/84884326590
U2 - 10.1007/978-3-540-74584-6_20
DO - 10.1007/978-3-540-74584-6_20
M3 - 会议稿件
AN - SCOPUS:84884326590
SN - 9783540745839
T3 - International Association of Geodesy Symposia
SP - 133
EP - 137
BT - VI Hotine-Marussi Symposium on Theoretical and Computational Geodesy - IAG Symposium
T2 - IAG Symposium - 6th Hotine-Marussi Symposium on Theoretical and Computational Geodesy
Y2 - 29 May 2006 through 2 June 2006
ER -