Application; Theory Of Operation For Globalstar Simplex - Globalstar STINGR User Manual

Revision 1.0 STINGR Users Manual

2 Application

2.1 Theory of Operation for Globalstar Simplex

The STINGR operates on the Globalstar LEO satellite network. LEO (Low Earth Orbit) means that there are a number of
satellites in low earth orbit that constantly orbit the planet and can communicate with Globalstar devices that are within
range of its current position.
Figure 2 LEO Constellation
Since the satellite position is constantly changing, simplex devices on the ground will transmit (with no knowledge of
any of the satellites locations) and the transmission may be received by one or more satellites. These satellites will then
relay the message to the nearest satellite gateway as shown below. Once received by the satellite gateway, the simplex
message will be delivered to the simplex gateway where redundant messages are discarded and the data from the
message is sent to the OEM via the Internet.
Revision 1.0 Subject To Change without Notice P a g e | 5
09/30/15