LuGRE

At distance of 63 earth radii

 During the lander’s lunar transit, LuGRE tracked signals in the L1/E1 and L5/E5 frequency bands. The farthest signal detected came from the Galileo constellation at 67.79 Earth radii (approximately 432,384 km from the receiver). The experiment demonstrated GNSS functionality near the Moon, where the lander orbited approximately 1.66 km/s1.

Despite the challenges of distance and velocity, the receiver achieved position accuracy within 1.5 km and velocity accuracy within 2 m/s. It successfully acquired signals from four GPS satellites (L1 and L5 frequencies) and one Galileo satellite (E1-E5 bands) during a one-hour observation window. Post-landing, LuGRE will attempt to receive GNSS signals on the lunar surface for 14 days.

Rough calculation, the max angle of 2 GPS satellites is only ~7 degrees apart, as seen from the moon .( 20,000 km above earth surface or 3 earth radius)

GPSWorld

UNOOSA

NASA

NTRS NASA

LNSS