SPRE Home Page
- The Spartan Packet Radio Experiment (SPRE) is an Amateur Radio (Ham radio) communications experiment. The primary mission was to test sat
ellite tracking using amateur packet radio and Global Positioning System (GPS). SPRE was developed and built by the University of Maryland Amateur Radio Association (UMARA) with assistance from NASA, volunteer engineers, and volunteer software professionals.
NAVSTAR GPS Timing Operations
- NAVSTAR GPS Timing Operations, USNO GPS Data & Information Files Global Positioning System Overview Current GPS Constellation, GPS Time Transfer Operations, GPS & Glonass Sat