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| Titel |
GALILEO Precise Orbit and Clock Determinaiton using GPS and GALILEO Combined Processing Strategy |
| VerfasserIn |
Hongzheng Cui, Geshi Tang, Baiyan Song, Huicui Liu, Chao Han, Maorong Ge |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250094227
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| Publikation (Nr.) |
 EGU/EGU2014-9627.pdf |
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| Zusammenfassung |
| The GALILEO system—still in its development phase—will be Europe’s GNSS, and the
in-orbit validation (IOV) phase has begun with launch of two IOV satellites, IOV-1 (E11) and
IOV-2 (E12). High precise data processing is the precondition for upgrading navigation
precision, monitoring and assessment of GNSS Open services, and expanding the application
region for satellite navigation system.
BACC is doing the work about operation and maintenance the iGMAS (international
GNSS Monitoring and Assessment Service) Analysis Center (BAC), and producing the
precision products to the users with equivalent accuracy to well-known institutes, such as IGS
and CODE including precise satellite orbit and clock, tracking station coordinate and receiver
clock, Zenith Total Delay (ZTD), Earth Orientation Parameter (EOP) parameters, global and
statistical integrity and Ionospheric map, and this study just focuses on the combined orbit
and clock.
For GALILEO in the initial deployment phase, in order to take advantage of GPS
observation and mature models to do joint orbit determination in a unified time and space
frame to improve the orbit of other systems, and use the GPS orbit and clock from joint
solution as the external check, we adopt combined orbit determination of GPS and GALILEO
fixing firstly the coordinate of station, receiver clock and tropospheric parameters using GPS
precise ephemeris and clock, and seting inter-system bias (ISB) between GPS and GALILEO
as a parameter to be estimated.
The observation data from a network of multi-GNSS capable receivers from the MGEX
tracking network and a regional multi-GNSS network operated by China from day
321 to 334 in 2013, and the satellite force models and GFZ standard observation
modeling except Yaw-control model are used in three day solution. For impact
analysis, we compare the GPS orbit and clock to IGS final orbit and clock products to
evaluate the accuracy, and the accuracy of GALILEO orbit and clock and can be
validated by checking the orbit differences of overlapping time span between two
adjacent three-day and SLR comparison. In addition, the characteristic on inter
system biases parameters involved the GPS/GALILEO systems is investigated. |
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