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Where to put a future #geodetic #satellite? We propose a "butterfly configuration" symmetrical to the Earth rotation axis. The best choice is the retrograde orbit - height=5600 km and inclination=127 degrees. See: doi.org/10.1029/2022JB… #IAG #GNSS #GGOS #Geodesy

Long-term ice mass changes in #Greenland and #Antarctica. New global gravity field solutions based on SLR starting in 1995 - more than 7 years before the #GRACE launch. See a paper in Remote Sensing of Environment: doi.org/10.1016/j.rse.… #gravity, #geodesy, #IAG, #GGOS, #SLR

In #GRACE and GRACE-FO solutions, C20 and C30 parameters are replaced by values from #SLR to derive changes in #Greenland and Antarctica. However, parameters are correlated and SLR can provide more. Thus, we propose to combine GRACE+SLR solutions instead doi.org/10.1186/s40645…

#ESA #GNSS Colloquium 2024 - Satellite Positioning, Orbit determination, Navigation, Timing, Reference Frames, Geodesy, Geophysics, Atmospheric Sciences, Fundamental Physics. Abstract submission is open at: atpi.eventsair.com/9th-gnss-scien… Come to #UPWr #Wroclaw in September 2024!

Accuracy of satellite positioning using #GNSS receivers in #sports #watches. 👉 New article tests how GPS, GLONASS, and Galileo receivers 🥇 positioning - w.r.t. geodetic GNSS receiver 🥈 distance measurements - on an athletic track 🥉 height difference. doi.org/10.1016/j.meas…

How to deal with tropospheric delays in #SLR data? The best option is to (1) use air pressure from meteo station at the SLR site, (2) estimate a tropo-bias, (3) use NWM, such as VMF3o, PMF or WMP for gradients+mapping fuction. See the new paper: doi.org/10.1186/s40645…

Since 2023, the whole BeiDou-3 MEO constellation has been tracked by Satellite Laser Ranging (SLR). SLR revealed different satellite types/groups based on orbit characteristics that are not identified in BDS-3 metadata. See the paper in GPS Solutions: doi.org/10.1007/s10291…

Can #GENESIS improve #Galileo orbits and clocks? What orbit quality is expected from GENESIS nadir-only, zenith-only, and combined nadir–zenith GNSS observations? See the latest paper in Journal of Geodesy: link.springer.com/article/10.100…

Where to place a future satellite 🛰 to determine the shape of the Earth🌍? Although thousands of artificial satellites are currently orbiting the Earth, none of them have an optimal orbit for determining GM and shape of the Earth. Journal of #Geodesy: doi.org/10.1007/s00190…

What happens to #GNSS satellites after many years of operation? The greatest instability in terms of orbital height is observed for #GPS satellites. Their height changes by up to 6.5 m per day, which gives 2.5 km per year! A new paper GPS Solutions: doi.org/10.1007/s10291…

Attending the #GRACE/GRACE-FO Science Team Meeting 2024 organized at #GFZ, Potsdam was a pleasure! My conference talk about #orbit parameters for future geodetic #satellites is available here: researchgate.net/publication/38… pic.x.com/mrV8a73iIz

New paper: "Changes in the Water Surface Level of the #Baltic Sea from #Satellite #Altimetry and #Gravity Missions" published in #Artificial #Satellites: sciendo.com/article/10.247… How much the sea level rise observed by altimetry missions can be explained by gravity field missions?

LARES-2 - seemingly inert cannonball is a powerhouse of scientific utility! Designed to probe the mysteries of general relativity and the fascinating whirlpools of spacetime, LARES-2 is redefining what we know about our planet. See the paper in JoG: doi.org/10.1007/s00190…

Nowy kierunek studiów na #UPWr! Inżynieria danych satelitarnych i kosmicznych to pierwsze w Polsce studia inżynierskie, które łączą data science, informatykę i nauki o Ziemi, przygotowując do pracy w dynamicznie rozwijającym się sektorze kosmicznym 🌍🛰️ 👉 bit.ly/41LK9Kv

How can we improve the determination of Earth's flattening and pear-shapedness tenfold? By placing a geodetic satellite where there currently isn't one! Specifically, at an inclination angle of 35–40 degrees and an altitude of 1500–3700 km. See the paper: doi.org/10.1007/s00190…

The current general relativistic orbit corrections miss one of the most important components - the Earth's flattening. It generates an orbital error of 5 mm for each day. See how to apply relativistic corrections properly to Earth-observing satellites: doi.org/10.1007/s00190…

Paper alert: Quality of #GNSS-based LEO orbits over long periods (21 years of data!): #GRACE-A/B/C/D, #SWARM-A/B/C, #Sentinel-3A/B, #CHAMP, #TerraSAR-X, and #TanDEM-X based on SLR data. See the GPS Solutions paper: link.springer.com/article/10.100…

How to correct the geocenter position in #GNSS solutions? Geocenter motion in GNSS solutions is ill-defined due to GNSS orbit modeling errors. As a result, GNSS satellites orbit around an artificial point with no geophysical interpretation. GPS Solutions: doi.org/10.1007/s10291…

Właśnie trwa rekrutacja na nowy kierunek - inżynieria danych satelitarnych i kosmicznych! Kierunek uzyskał wsparcie POLSA i wielu firm technologicznych. Piszą o nas: businessinsider.com.pl/technologie/na… spaceagency.prowly.com/408993-kosmicz… gazetawroclawska.pl/kosmiczny-kier… i wielu innych!

W radiu ESKA na temat nowego kierunku studiów: inżynieria danych satelitarnych i kosmicznych: facebook.com/share/v/1ME2Gy…