GNSS Tracking Technology
Years ago, the GPS (Global Positioning System) was created in America as a constellation of medium earth orbit satellites. Now many other countries can to tracking with the new Global Navigation Satellite Systems (GNSS) technologies.
The frequencies used in various GNSS systems are:
GPS: 1575.42 MHz
Galileo: 1575.42 MHz
GLONASS: 1602 MHz
QZSS: 1575.42 MHz
BeiDou: 1561.098 MHz