SatLink3 – Iridium® How it Works

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SatLink3 SL3 Iridium

SatLink3 provides a cost-effective way to measure, log, calculate and transmit data from remote locations around the world. Most often used directly connected to sensors and transmitting data on a user-set schedule, the SatLink3 has options for cellular and Iridium communications.

The ability to connect to the SatLink3 using various communications, such as Iridium, offers the unique ability to transmit and receive data from multiple sources all through a single transceiver – ensuring transmission redundancy and security.

Overview of Telemetry via Iridium

  • Ideal for sending small amounts of data
  • Periodic transmissions at user set times with data in user selectable format
  • Diagnostics to track amount of data being sent & performance of telemetry
  • Stations with Iridium are ALERT compatible via Hydromet Cloud
  • Supports remote data collection, maintenance or control of 2 on/off devices
  • Optional authentication of incoming messages to ensure trusted source

How Does Iridium® Work?

The Iridium® Global Satellite Constellation provides 2-way communications for remote stations anywhere in the world & delivers data how and when you want it. Since typical SBD messages range from 10 to 200 bytes, Iridium® is ideal for sending small amounts of data to and from extremely remote hydromet stations.

  • Iridium’s fully-meshed network of 66 low-earth orbiting satellites enable worldwide continuity of service
  • Data coverage anywhere on earth – regardless of how remote a location might be
  • Telemetry solution for the most remote sites on Earth, where no other communication is available
  • Sutron is an authorized Iridium Value Added Partner/Dealer providing global Services & Applications

Having 66 Iridium satellites orbiting around the earth, provides a mesh network for all users, and it is extremely reliable.  The data is transmitted from each SL3 directly to the nearest low orbiting satellite, and then data is sent from satellite to satellite until it reaches the Iridium Gateway in Arizona.  As you can see in the diagram each satellite can receive and forward data being received from SL3 station.  The network never relies on ground transportation where data can be lost due to incremental weather and disasters.  Also, there is no concern of transmissions colliding with each other since each station has its own unique IMEI ID number.

Telemetry SL3

Iridium uses a short burst data package to both send and receive messages.  Each transmission must be smaller than 340 bytes, however Sutron has developed a buffer in our transmitters so if longer messages are needed to be transmitted, they can be separated into multiple transmissions. (Up to 5). So, realistically you can transmit close to 1700 bytes each time.  Typically, transmissions take approximately 5-10 to send the data to the Gateway, however when a station is in a deep canyon or has obstructions near the station, a transmission can take up to 30 seconds waiting for the next satellite to be in position.  You can receive the Iridium data via email, DirectIP, and Hydromet Cloud.  All of these options are available to you now.


Click here to learn more about the SatLink3 with Iridium

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