GPS Anti-Jam M-Code Takes Two Steps Forward - Breaking Defense
ESA - Galileo satellites
How many satellites are operating in space? | World Economic Forum
GPS (Navstar) - Gunter's Space Page
Technology in Focus: GNSS Receivers | Hydro International
USA-213 - Wikipedia
Feb. 14, 1989: GPS Enters Orbit | WIRED
GPS.gov: Space Segment
How Does GPS Work? | NASA Space Place – NASA Science for Kids
SDRs for M-code satellite military communications - Military Embedded Systems
What Material Will Block GPS Signals?
How Do Satellites Keep Track Of Their Own Position?
L3Harris delivers experimental navigation satellite
GPS? With Starlink, We Don't Need It Any More! | Hackaday
GPS-2A (Navstar-2A) - Gunter's Space Page
GLONASS company to build 27 more satellites - GPS World
GPS Block III: a new generation of GPS satellites now included in the EGNOS solution | EGNOS User Support
GPS Block III - Wikipedia
An FCC rule change allows US residents to navigate with Galileo instead of GPS | TechSpot
List of GPS satellites - Wikipedia
Get the insider's view on satellite technology today - Military Embedded Systems
GPS rules everything. A new satellite launch keeps a big upgrade rolling - CNET
Inside China's $9Bn Space Plan to Challenge American GPS | 2018-11-27 | SupplyChainBrain
