NNF webinar “Real-time Precise Point Positioning in LEO” - Shared screen with speaker view
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Welcome to today's webinar! The webinar is being recorded.Thursday March 11th, 2021“Real-time Precise Point Positioning in LEO”The presentation is given by Javier Tegedor from Fugro. He is technical lead for the development of next generation Fugro satellite positioning services.Abstract:GPS/GNSS-based Precise Orbit Determination (POD) is a key technology for the success of many satellite missions, in applications such as Earth Observation, RF-geolocation or improved collision avoidance, for example. However, current standalone GNSS performance limits the achievable accuracy on-board. In order to overcome this limitation, GNSS data is typically post-processed in the ground for obtaining precise estimation of the satellite’s state vector. Now, thanks to Fugro’s SpaceStar™, it is possible to obtain sub-decimeter POD real-time on-board, using Precise Point Positioning technology and Fugro existing infrastructure for the delivery precise GNSS orbit/clock corrections to LEO satellites via L-band.
Upcoming Nordic Institute of Navigation webinars: http://www.nornav.org/nnf-webinars-2q-2021.6371633-27945.html
Low-cost miniature atomic rubidium clocks are now available. Have you modeled the performance improvement if a mini atomic clock was available on the LEO satellite, especially during polar outages?
The GEO infrastructure providing Ephemeris and clock correction is already available ? How many satellite are currently available providing L-band Ephemeris and Clock corrections? Such corrections are re-computed on-ground by your infrastructure or they are broadcasted by using PPP legacy corrections made available by GNSS infrastructure ?
Thank you for a very interesting presentation, Javier!Usually, 1 OD per day is enough in LEO to do precise collision avoidance, and 3-4 times per day in lower orbits, due to the drag (as with Aeolus). Both cases are usually solved by ground passes and doing the OD on ground. As coordination is managed from ground, the orbital parameters must anyway be downlinked to be useful in the COLA process.What is the customer need you intend to solve, in regard to collision avoidance, by doing real-time on-board OD?
Thank you so much
Thanks for the inspring talk, Javier! I have two questions: (a) howe do you rank the use of Fugro corrections (via GEO satellites) against the use of Galileos High Accuracy Service (b) You stated a 5mm velocity accuracy, but most of the applications you mentioned (maneuevr calibration, formation flying, docking) need a 10-100 times betetr performance adn can only be supproted by a dynamic onbord POD. Can you comment?
How about the convergence time in onboard LEO PPP? On the ground, in the case of PPP long convergence time is a drawback.
Thank you, Javier :)
Tino den Ouden - Vodafone
Peter van den Elshout
Thank you, very interesting session !
Thank you very much
thank you Javier, thank you all!
Thanks and take care!