Spire Global adding high-capacity Ku-band antennas to satellites

Spire Global said May 10 it is installing Ku-band antennas from fellow smallsat operator Kepler Communications on at least three satellites to offer higher capacity data services beginning next year. Their deal enables Spire to add high-speed Ku-band capabilities to its fleet in low Earth orbit under Kepler’s existing regulatory licenses, and includes an option to scale up to 50 satellites. U.S.-based Spire currently provides weather and tracking services with more than 100 satellites in LEO that transmit data in UHF, S and X-bands. The company also provides a service that offers its technology, ground station network and automated operations systems to others for deploying their own applications and sensors to orbit relatively quickly. With a Ku-band software-defined radio from Canada-based Kepler, a Spire satellite would be able to send larger amounts of data back to Earth for more data-intensive operations.  Spire head of communications Hillary Yaffe said the Ku-band payload will benefit customers that include Canadian startup NorthStar Earth & Space, which March 16 said Spire will deliver and operate satellites focused on space situational awareness and debris monitoring. Spire’s deal with NorthStar is for an initial three 12-unit cubesats for launch in 2023, with an option to expand to a full constellation of dozens of satellites.

Spire satellites track maritime, weather, and and aviation data from space. Credit: Spire Global

Service expansion 

Kepler said its 19 satellites each have a variant of the Ku-band payload for a constellation that generates most of its revenues from providing connectivity to devices beyond the reach of terrestrial networks.

The Canadian company has been seeking to expand into new markets after raising $60 million in June, including plans for data-relay services with an S-band terminal that successfully tested inter-satellite links earlier this year.

In a separate deal announced Dec. 16, Kepler said it plans to test its data relay terminal on a Spire nanosatellite slated to launch late in 2022.

Flown as a hosted payload, Kepler’s new Ku-band service includes the ground infrastructure needed to provide an end-to-end data transmission service.

Mina Mitry, Kepler’s CEO, said undisclosed customers are already using the Ku-band terminals on its satellites to “transmit large quantities of data point-to-point across the globe quickly.”

These customers are using a new service Kepler calls Global Data Services (GDS), he said, which is designed to be compatible with third-party fixed, maritime and next-generation flat panel antennas.

According to Kepler, GDS has achieved more than 300 megabits per second (Mbps) of data speeds from LEO to a 3.4-meter dish on the ground with its Ku-band technology — and 240 Mbps on a Kymeta flat panel antenna.

“GDS has helped our customers move data and given us valuable flight heritage for our next generation Ku-Band service – testing and validating the technology on the 19 satellites on-orbit,” Mitry said via email.

He declined to disclose a dollar value for its Ku-band antenna contract with Spire, which went public in August by merging with a special purpose acquisition company (SPAC).

The first Spire satellites with Ku-band service are slated to launch in early 2023.

While the standard version of Kepler’s Ku-band software-defined radio is designed for satellites in LEO, Mitry said its in-house manufacturing capabilities enable the company to adapt the technology for other orbits and customer needs.

Kepler and Magellan to fly innovative smart radiator device on satellite mission

Kepler Communications ("Kepler"), a Canadian satellite telecommunications provider, and Magellan Aerospace Corporation have signed a Letter of Intention to fly an innovative Smart Radiator Device (SRD) on Kepler's third satellite, scheduled for launch later this year. The unique SRD, designed to significantly improve temperature management on-board future satellites, is being developed by MPB Communications in partnership with Magellan Aerospace. This innovative SRD technology is being developed as part of a technology development program with the goal to improve its technology readiness level by eventually operating in the space environment. Kepler intends to be the first to use this technology as part of their satellite's thermal control hardware suite before the end of 2019. The SRD radiator design has a unique property in which its effectiveness in emitting or retaining heat (its "emissivity") changes with temperature. Heat dissipation increases at elevated temperatures and reduces at lower temperatures. The tunable radiator keeps the spacecraft within tighter temperature bounds and reduces the need for survival heaters when the spacecraft is cold. The SRD's properties are highly desirable for space applications, especially for communication satellites where the payloads tend to rapidly heat up at the time of transmitting signals (up to 80C) and quickly get colder (down to -20C) when dormant.

With the SRD, Kepler will be able to keep the spacecraft in the "Goldilocks Zone": not too hot, not too cold. "We are looking forward to seeing this new technology in action and how it will benefit next-gen satellite platforms moving forward," says Jared Bottoms, Kepler's Lead Systems Engineer.

"Magellan is looking forward to continuing the development of the SRD with MPB, and is excited about the upcoming flight opportunity with Kepler" says Corey Mack, Space Business Unit Leader at Magellan.