The IDRS™ concept brings the capabilities of the Inmarsat BGAN system to space by integrating the IDRS™ terminal into a LEO spacecraft. While in orbit, the IDRS™ link to the Inmarsat BGAN Ground Network is maintained via the global constellation of the INMARSAT 4 GEO satellites. Building upon INMARSAT-4 constellation and its BGAN ground infrastructure, both GLOBAL coverage and Global connectivity are being achieved. Leveraging on the BGAN service portfolio, this provides a range of always-on, on-demand, real time connectivity, thus resolving the need to wait for the LEO satellite to pass above a ground station!
At the same time, it supports the following IP services:
• Background IP
• Streaming IP and
• Assured IP
System Concept Diagram

Service coverage map at 500 km altitude (2017)

System Information:
Addvalue IDRS™ POC Terminal is a CubeSat two unit form factor with the following:

- Two independent BGAN transceivers for redundancy
- Built in GPS Receiver
- Approximate weight is 2.3kg
- Peak power: 22W
- Typical operation power 10W (use cases in Telemetry, Tracking and Command, Tasking)
- Dimension is 96 x 89 220 mm (L x W x H)

The Addvalue IDRS™ terminal is a good fit for LEO satellites of all sizes, down to the “New Space” Nano-satellites.
Service Capabilities – Connection characteristics:
- Support uninterrupted, seamless IP session during rapid spot beam handovers
- Spot-beam handover frequency is every 2 to 3 minutes
- IP session is NOT interrupted during spot beam handovers
- Low latency of between 0.5 to 1.5 seconds
- Short interruption only in satellite to satellite handovers (order of 20 seconds)
- Re-acquisition / registration (to BGAN network) may take a few seconds
- Assumes a fixed antenna, i.e., no re-pointing time
- High network availability (>99.5%) as well as high link availability (<99%) and reliability provided by Inmarsat BGAN communications network
- Coverage may varies with LEO orbital altitude and inclination
- Typical Forward link (16 QAM) is between 200 to 300kbps and Return link (QPSK) is between 96 to 250kbps)
