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Title of Journal: J Geod

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Abbravation: Journal of Geodesy

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Springer-Verlag

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DOI

10.1007/s001090050246

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1432-1394

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Precise orbit determination for the FORMOSAT3/COS

Authors: Cheinway Hwang TzuPang Tseng Tingjung Lin Dražen Švehla Bill Schreiner
Publish Date: 2008/08/08
Volume: 83, Issue: 5, Pages: 477-489
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Abstract

The joint Taiwan–US mission FORMOSAT3/ 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 zerodifference carrierphase 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 6h orbit overlaps of two 30h 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 realtime and WHU postprocessed is about 10 cm which is largely due to different uses of GPS ephemerides highrate GPS clocks and force models The kinematic orbits of COSMIC are expected to be used for recovery of temporal variations in the gravity field

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