Simulation of precise orbit determination of COSMIC from onboard GPS zero-difference phase data with kinematic method

Jinyun Guo*, Chein-way Hwang, Zipang Tseng, Xiaotao Chang

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

COSMIC is a constellation mission to study the climate, ionosphere and geodesy. The main geodetic mission of COSMIC is to determine the global gravity field model and its temporal variations, which need the precise geometric orbit of COSMIC. GPS observations onboard COSMIC are simulated using the GPS precise final orbit and high-rate clock of CODE, the designed orbit of COSMIC and the GPS antennae for precise orbit determination (POD). The precise geometric orbits of COSMIC are determined with the kinematic method from the space-borne simulated observations to test the POD capability of GPS antennae. There are two POD GPS antennae onboard COSMIC, named as POD +X and -X. The orbit from POD -X antenna has the approximately same precision as that from POD +X antenna, and the errors of both are greater than the given random error while simulating GPS data. The main reason is that the designed positions of POD antennae are not good. There are the different angels between the boresight vector and zenith direction of two antennae. Another reason is that POD +X antenna is in the flying direction and POD -X antenna is in the inverse direction. In order to get the high precision of POD, a virtual antenna is constructed from POD +X and -X, whose center is the center of mass of COSMIC. Observations from POD +X and -X then are reduced to the virtual antenna. Comparing with the referenced orbit and the kinematic orbit from the virtual antenna, the precision of orbit is consistent to the given random error when simulating GPS data, up to centimeter level.

Original languageEnglish
Title of host publicationSecond International Conference on Space Information Technology
DOIs
StatePublished - 1 Dec 2007
Event2nd International Conference on Space Information Technology - Wuhan, China
Duration: 10 Nov 200711 Nov 2007

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume6795
ISSN (Print)0277-786X

Conference

Conference2nd International Conference on Space Information Technology
CountryChina
CityWuhan
Period10/11/0711/11/07

Keywords

  • COSMIC
  • GPS zero-difference phase data
  • Precise kinematic orbit determination
  • Virtual antenna

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