Precise orbit determination using a LEO-GPS satellite to satellite tracking approach

• Autorzy: Caporali A. , Dalla Torre A. , Facchinetti C.
• Konferencja: 7th Bilateral Geodetic Meeting Italy-Poland (7; 22-24.05.2003; Bressanone, Italy)
• Języki publikacji: EN

Abstrakty

EN

The tracking requirements for a Low Earth Orbit (LEO) satellite are defined by the overall accuracy of the results each mission is designed for. Examples of satellites asking for Precise Orbit Determination are remote sensing satellite and geodetic satellites. The paper addresses some basic considerations for the design of a GPS data processing technique for the high-precision position determination of a GPS/GLONASS receiver. Once the position of the receiver is known, this information can be used to determine the orbit of Low Earth Orbit (LEO) satellites. The precision requirements to be fulfilled have to be compatible with the definition of Precise Orbit Determination (POD): in most of applications the accuracy for post processed data is required to be meter or even sub decimetre in the radial direction, particularly in those cases where a radar altimeter is on board typically for oceanographic applications, or for Intefferometric SAR. The use of GNSS receiver on board and the support of a ground station network with a set of appropriate postprocessing tools allows to fulfil also the more stringent requirements for the Precise Orbit Determination. Two are the major class of teehniques that have been historically used: the Geometric and the Dynamic approaches. Each of these concepts had advantages and disadvantages. The most important advantage of the geometric approach relies on its simplicity and that it has the potential to work in the presence of forces which were absent from the dynamic model. Now that the IGS products have become fairly standardised, and very precise predictions are going to be available in the next future with a very short delay time, and space 'ali in view receivers' are capable of tracking all the visible satellites, and possibly also the GLONASS satellites, the geometric solution has to be reconsidered. The technique chosen to perform these solutions is then the simple geometric point positioning approaeh using, for every epoch, pseudoranges measurements smoothed using phase data. The navigation satellite orbits are taken from the International GPS Service (IGS) products. To test the GPS POD sensor, the data provided by some in-orbit satellites with on board GPS receivers (es: CHAMP and SAC-C) can be used.

Słowa kluczowe

EN

GPS system; GNSS system; satellite geodesy

PL

geodezja satelitarna; GPS system; GNSS system

• Wydawca: Wydział Geodezji i Kartografii Politechniki Warszawskiej
• Czasopismo: Reports on Geodesy
• Rocznik: 2003
• Tom: z. 2/65
• Strony: 221--233
• Opis fizyczny: wykr., schem., tab.

Twórcy

autor

Caporali A.

• Centro Interdipartimentale di Studi e Attivitá Spaziali CISAS 'G. Colombo', and Dipartimento di Geologia, Paleontologia e Geofisica, University of Padova, Italy

autor

Dalla Torre A.

• Centro Interdipartimentale di Studi e Attivitá Spaziali CISAS 'G. Colombo', and Dipartimento di Geologia, Paleontologia e Geofisica, University of Padova, Italy

autor

Facchinetti C.

• Centro Interdipartimentale di Studi e Attivitá Spaziali CISAS 'G. Colombo', and Dipartimento di Geologia, Paleontologia e Geofisica, University of Padova, Italy