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A key concern of SDA is to to make sure satellites from different vendors are interoperable.
The next procurement of satellites by SDA is expected later this year. The agency intends to buy 150 satellites to be launched in late 2024. The plan is to award multiple contracts as SDA wants to create an open marketplace where vendors can compete for orders. The concern, however, is to make sure that satellites from different manufacturers can talk to each other.
“SDA is seeking industry feedback on its ability to support a homogeneous constellation design,” said the request for information.
SDA already has acquired 28 satellites for its Tranche 0 constellation. The next batch of 150 satellites will be Tranche 1.
SDA expects the Tranche 1 constellation to be deployed in six near-polar circular planes with tens of satellites at 1,000 km altitude in each plane, the agency said. “SDA is interested in deploying a homogeneous constellation design, with all space vehicles equipped with baseline mission payloads, and is seeking feedback on industry capability to design and develop these integrated space vehicles.”
A critical requirement for SDA satellites are optical crosslinks. Any future military network has to be able to pass huge amounts of data from satellite to satellite, from space to the ground and from space to aircraft in flight.
Satellites for Tranche 1 must have optical inter-satellite links and the ability to establish and maintain at least three optical links concurrently, with an objective of five or more.