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9150-0125-01 R-4
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.
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.
ST150M User Manual
FIGURE 2 - LEO CONSTELLATION
FIGURE 3 - SIMPLEX IOT MESSAGING DATA FLOW
Confidential & Proprietary Information
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