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9150-0125-01 R-1
2. APPLICATION
2.1. THEORY OF OPERATION FOR GLOBALSTAR COMMERCIAL IOT
The ST150M IoT Module 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
Because the satellite position is constantly changing, commercial IoT 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 (Figure 3). 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 IOT MESSAGING DATA FLOW
ST150M User Manual
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