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Seminarium Naukowe IGiG – Dr Tomasz Kur

22-05-2023

IGG ma przyjemność zaprosić Państwa na seminarium naukowe, które odbędzie się zdalnie z wykorzystaniem platformy Zoom. Prezentację zatytułowaną "The application of inter-satellite links in orbit determination of GNSS satellites: simulation studies" przedstawi Dr Tomasz Kur z naszego instytutu.



Seminarium rozpocznie się w czwartek 25 maja 2023 r. o godzinie 09:00 AM (CEST).




Dołącz do spotkania Zoom: ZOOM LINK

Identyfikator spotkania: 811 427 0260

Kod dostępu: igig




The application of inter-satellite links in orbit determination of GNSS satellites: simulation studies

Dr Tomasz Kur, Instytut Geodezji i Geoinformatyki, UPWr




Abstrakt:

To improve the quality of navigation satellite orbit determination it is planned to equip the next-generation satellites with new on-board instruments, e.g., optical clocks with increased precision, accelerometers to measure non-gravitational accelerations, and inter-satellite links (ISL).

In this presentation, first the current state-of-art of ISL is discussed. Then, main results and conclusions of simulation studies on the ISL use in the Galileo constellation performed by the author are summarized. Evaluation of simulation results of the ISL in the orbit determination procedure is presented in terms of (1) influence of the used connectivity scheme and (2) impact of the ISL for different observation parameters and weighting methods. First point concerns general geometric analysis of selected connectivity schemes, dependence of the results of the orbit and clock estimation on the geometry of navigation constellations (i.e., its Walker definition). Second issue regards the impact of the inter-satellite links in different observation scenarios including number of used ground stations, ISL measurement intervals, and relative weighting of the GNSS and the ISL observations using variance component estimation. Additionally, the assessment of ISL range bias estimation with alternative ISL calibration are considered.

The work aims at determining the possible gains from the new type of observations, but also to develop a methodology concerning adaptation of the least squares procedure for orbit determination with the use of the ISL with evaluation of the relative weighting methods. The results show high efficiency of the inter-satellite links, especially in difficult observation conditions, which in turn may contribute to better reliability of the navigation constellations.