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Kinematic orbit determination of low Earth orbiting satellites, using satellite-to-satellite tracking data and comparison of results with different propagators
KTH, School of Architecture and the Built Environment (ABE), Urban Planning and Environment, Geodesy and Geoinformatics.
2014 (English)Independent thesis Advanced level (degree of Master (Two Years)), 80 credits / 120 HE creditsStudent thesis
Abstract [en]

GPS data from Challenging Mini-satellite Payload (CHAMP) is used for its orbit determination for the epoch day of January 1st 2002.  The orbit of CHAMP is computed from the GPS data and ionospheric effects are removed by frequency combination.

Further, the orbits of CHAMP for the same epoch day are computed using the satellite tool kit (STK) employing simplified general perturbations (SGP4) and a high precision orbit propagator (HPOP).

Furthermore, orbits computed using GPS data are also compared with jet propulsion laboratory’s published CHAMP spacecraft orbit and we have found that root mean square difference in ECEF position X component is below 0.01km other than some spikes at poles. The standard deviation of the difference in ECEF position X coordinate (JPL results – GPS computed results) is 11.7m. Since JPL computed orbits are considered as true orbits of CHAMP with accuracy of centimeter level ( Therefore this difference can also be referred as observed error in GPS computed orbits. Considering above discussion, we can expect that accuracy of our computed satellite positions (using GPS data) is about 12 metres for other than poles area. However there are some occasional spikes, especially at poles, having maximum errors (about 0.055 km).

Place, publisher, year, edition, pages
2014. , 75 p.
, The TRITA-GIT Series, ISSN 1653-5227 ; 14-001
Keyword [en]
GPS, HPOP, Orbit Determination, STK, SGP4
National Category
Other Natural Sciences
URN: urn:nbn:se:kth:diva-142629ISRN: KTH/GIT/EX--14/001-SEOAI: diva2:703795
Educational program
Master of Science - Electrophysics
Available from: 2014-05-06 Created: 2014-03-09 Last updated: 2014-05-06Bibliographically approved

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Master of Science Thesis in Geodesy No. 3130 TRITA-GIT EX 14-001(1380 kB)52 downloads
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