8545-0198-01 Revision 1.9 STX3 Users Manual
9/24/2020 Globalstar, Inc. Confidential and Proprietary Page | 2
2 Application
2.1 Theory of Operation
The STX3 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.
Figure 3 Simplex Messaging
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