Telit Wireless Solutions ME910C1 Series - Background Information; GPS- Global Positioning System

LE910Cx/ME910C1/ML856C1/NE910C1 A-GPS Application Note
80529NT11738A Rev. 3 Page 7 of 22 2021-09-27
Not Subject to NDA
2. BACKGROUND INFORMATION
GPS- Global Positioning System
The GPS system is based on a constellation of 24 satellites that are evenly spread across
six circular orbital planes with a height of around 20200 km. Orbits in this height are
referred to as medium earth orbit (MEO).
Each satellite has an atomic clock and follows a known orbit: GPS receivers use the time
information regularly transmitted by the satellites and the time elapsed for receiving this
signal from each satellite to compute their positions.
Note: The detailed description of the GPS system is beyond the scope
of this document.
Figure 1: ECEF Coordinate System