Tipton, KS | epw - 5/17/2026 20:50
need at least 4 sats from the SAME constellation
"To get a precise location, your device must connect to a minimum of four satellites from the same constellation (such as the U.S. GPS, European Galileo, or Russian GLONASS). Three satellites calculate your latitude, longitude, and altitude, while the fourth corrects the clock error in your receiver."
See: https://oceanservice.noaa.gov/education/tutorial_geodesy/geo09_gps.h...
>benefit to receivers with more constellations?
GPS accuracy: The benefits of tracking all four global GNSS constellations
Back in 2015, the u-blox M8 GNSS receiver platform made major inroads in improving positioning performance, with the ability to concurrently track two and later three GNSS constellations simultaneously. Roughly tripling the number of satellites within line of sight at any given time brought significant benefits: Not only could positions be computed more accurately using the best signals from a larger set; it also significantly shortened the time to first fix, in particular in challenging urban environments.
https://www.u-blox.com/en/blogs/tech/gps-accuracy-four-gnss-constell...
|
Topcon AGS2 RTK fix issue
