Precise orbit determination for the FORMOSAT-3/COSMIC satellite mission using GPS |
| |
Authors: | Cheinway Hwang Tzu-Pang Tseng Tingjung Lin Dražen Švehla Bill Schreiner |
| |
Institution: | 1.Department of Civil Engineering,National Chiao Tung University,Hsinchu,Taiwan;2.Institute of Astronomical and Physical Geodesy,Technische Universit?t München,Munich,Germany;3.University Corporation for Atmospheric Research (UCAR),Boulder,USA |
| |
Abstract: | The joint Taiwan–US mission FORMOSAT-3/ COSMIC (COSMIC) was launched on April 17, 2006. Each of the six satellites is equipped
with two POD antennas. The orbits of the six satellites are determined from GPS data using zero-difference carrier-phase measurements
by the reduced dynamic and kinematic methods. The effects of satellite center of mass (COM) variation, satellite attitude,
GPS antenna phase center variation (PCV), and cable delay difference on the COSMIC orbit determination are studied. Nominal
attitudes estimated from satellite state vectors deliver a better orbit accuracy when compared to observed attitude. Numerical
tests show that the COSMIC COM must be precisely calibrated in order not to corrupt orbit determination. Based on the analyses
of the 5 and 6-h orbit overlaps of two 30-h arcs, orbit accuracies from the reduced dynamic and kinematic solutions are nearly
identical and are at the 2–3 cm level. The mean RMS difference between the orbits from this paper and those from UCAR (near
real-time) and WHU (post-processed) is about 10 cm, which is largely due to different uses of GPS ephemerides, high-rate GPS
clocks and force models. The kinematic orbits of COSMIC are expected to be used for recovery of temporal variations in the
gravity field. |
| |
Keywords: | Attitude FORMOSAT-3/COSMIC GPS Kinematic orbit Reduced dynamic orbit |
本文献已被 SpringerLink 等数据库收录! |
|