AFRL's little NTS-3 test satellite holds 100 possibilities to help secure or backup GPS - Breaking Defense
The Biden Administration Must Designate Civilian Satellites Critical Infrastructure - Scientific American
Scientists create their own GPS by spying on internet satellites | Science | AAAS
GPS.gov: Space Segment
Wayward Satellites Test Einstein's Theory of General Relativity - Scientific American
Updates: SpaceX launches Space Force GPS satellite from Cape Canaveral
Adios GPS! US Air Force Could Eventually Dump 'Vulnerable' GPS For NTS-3 As Russia, China Wield Laser, EW Prowess
ICEYE and SATLANTIS Propose New Tandem4EO Constellation
Satellite constellation - Wikipedia
List of GPS satellites - Wikipedia
Swarm (Geomagnetic LEO Constellation)
How many satellites are operating in space? | World Economic Forum
ESA - How satellite navigation works
GPS III: What You Need to Know About the Future of Global Navigation | Digital Trends
GPS Accuracy and GPS Drift - Should you rely on it anymore? - Mosaic51
GPS III Satellites - General Dynamics Mission Systems
SpaceX Falcon 9 launches fifth GPS satellite for U.S. Space Force - SpaceNews
GPS vs GNSS: Understand PNT Satellite Systems — Masterclock, Inc.
How many satellites are operating in space? | World Economic Forum
EarthSky | Who owns all the satellites?
Lesson 1: The GPS Signal
FAA: GPS Outage Won't Count As ADS-B Violations - AVweb
Visualizing All of Earth's Satellites: Who Owns Our Orbit?
All You Need to Know about the GPS / GNSS Week Number Rollover | Septentrio
