Addvalue produced the terminal for Inmarsat's Inter-Satellite Data Relay System, which was tested in orbit on the Velox-11 satellite built by Nanyang Technological University's Satellite Research Center in Singapore. Credit: AVI

SAN FRANCISCO — For more than a year, mobile satellite services provider Inmarsat has been working with Addvalue Innovation (AVI), a communications technology company based in Singapore, to conduct secret tests of a service that lets operators maintain continuous contact with small satellites in low Earth orbit. Now, the companies are ready to offer the Inter-satellite Data Relay Service (IDRS) to satellite operators.

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Debra Werner is a correspondent for SpaceNews based in San Francisco. Debra earned a bachelor’s degree in communications from the University of California, Berkeley, and a master’s degree in Journalism from Northwestern University. She is a recipient...