One possible error source in GPS calculations is the multipath effect. The GPS satellite signal can bounce off of nearby structures so your GPS receiver detects the same signal twice glonass gps gps error Efeito multicaminho GPS
Illustrates one source of GPS error: atmospheric conditions. The atmosphere refracts the satellite signals as they pass through on their way to the earth's surface glonass gps gps error GPS - condições atmosféricas
Demonstrates how GPS works using trilateration. Each satellite is at the center of a sphere and where they all intersect is the position of the GPS receiver glonass gps gps satellites Satélites GPS - triangulação