CesiumAstro to Provide Ka-Band Communications Payloads for SDA's T2TL Constellation

CesiumAstro to Provide Ka-Band Communications Payloads for SDA's T2TL Constellation

CesiumAstro, one of the industry leaders in active phased array communications technology for space and airborne systems, announced that the company was selected by Rocket Lab to provide its Vireo active electronically scanned array (AESA) radio frequency (RF) communications payload for integration on 18 space vehicles (SVs) supporting the Space Development Agency’s (SDA’s) Tranche 2 Transport Layer (T2TL)

Launching in mid-2027, the payload will be the first multi-beam-capable Ka-band communications system operating in SDA’s Proliferated Warfighter Space Architecture (PWSA), a layered low-Earth orbit (LEO) satellite constellation designed to deliver secure, low-latency communications and missile tracking capabilities for the U.S. Department of Defense.

CesiumAstro’s Vireo payload is the culmination of more than seven years of the company’s AESA research, development, testing, and manufacturing. A receive antenna, transmit antenna, and SpaceVPX form-factor reconfigurable processor enable powerful single- and multi-beam operation.

“Our Vireo system’s multi-beam capability doesn’t just meet the needs of the warfighter but exceeds them. This cutting-edge technology will be a force multiplier for every branch of the Department of Defense,” said Shey Sabripour, Founder and CEO of CesiumAstro. “We are honored to be selected by Rocket Lab to deploy CesiumAstro’s active phased array technology and help to defend America’s national security interests.”

Rocket Lab’s 18 satellites are part of the T2TL Beta Program, which features multiple SV and mission configuration variants fielded to provide global communications access and deliver persistent regional encrypted connectivity in support of warfighter missions. When fully operational, the Transport Layer constellation will include hundreds of SVs operating in low-Earth orbit, including 90 total Beta Program configurations.

“We’re pleased to be flying the CesiumAstro Vireo communications payload,” said Rocket Lab’s Vice President of Space Systems, Brad Clevenger. “This mission will be a significant demonstration our spacecraft’s ability to support diverse applications in low-Earth orbit. The Vireo system’s advanced single- and multi-beam capabilities perfectly align with our Pioneer bus, showcasing the technological advancements we’re enabling.”

Compatible with many different defense and commercial missions, the Vireo payload’s mass-manufacturable design and configurable architecture allow for rapid deployment with maximum flexibility.

Click here to learn more about CesiumAstro's Vireo Ka-Band Communications Payloads.

Publisher: SatNow

GNSS Constellations - A list of all GNSS satellites by constellations


Satellite NameOrbit Date
BeiDou-3 G4Geostationary Orbit (GEO)17 May, 2023
BeiDou-3 G2Geostationary Orbit (GEO)09 Mar, 2020
Compass-IGSO7Inclined Geosynchronous Orbit (IGSO)09 Feb, 2020
BeiDou-3 M19Medium Earth Orbit (MEO)16 Dec, 2019
BeiDou-3 M20Medium Earth Orbit (MEO)16 Dec, 2019
BeiDou-3 M21Medium Earth Orbit (MEO)23 Nov, 2019
BeiDou-3 M22Medium Earth Orbit (MEO)23 Nov, 2019
BeiDou-3 I3Inclined Geosynchronous Orbit (IGSO)04 Nov, 2019
BeiDou-3 M23Medium Earth Orbit (MEO)22 Sep, 2019
BeiDou-3 M24Medium Earth Orbit (MEO)22 Sep, 2019


Satellite NameOrbit Date
GSAT0223MEO - Near-Circular05 Dec, 2021
GSAT0224MEO - Near-Circular05 Dec, 2021
GSAT0219MEO - Near-Circular25 Jul, 2018
GSAT0220MEO - Near-Circular25 Jul, 2018
GSAT0221MEO - Near-Circular25 Jul, 2018
GSAT0222MEO - Near-Circular25 Jul, 2018
GSAT0215MEO - Near-Circular12 Dec, 2017
GSAT0216MEO - Near-Circular12 Dec, 2017
GSAT0217MEO - Near-Circular12 Dec, 2017
GSAT0218MEO - Near-Circular12 Dec, 2017


Satellite NameOrbit Date
Kosmos 2569--07 Aug, 2023
Kosmos 2564--28 Nov, 2022
Kosmos 2559--10 Oct, 2022
Kosmos 2557--07 Jul, 2022
Kosmos 2547--25 Oct, 2020
Kosmos 2545--16 Mar, 2020
Kosmos 2544--11 Dec, 2019
Kosmos 2534--27 May, 2019
Kosmos 2529--03 Nov, 2018
Kosmos 2527--16 Jun, 2018


Satellite NameOrbit Date
Navstar 82Medium Earth Orbit19 Jan, 2023
Navstar 81Medium Earth Orbit17 Jun, 2021
Navstar 78Medium Earth Orbit22 Aug, 2019
Navstar 77Medium Earth Orbit23 Dec, 2018
Navstar 76Medium Earth Orbit05 Feb, 2016
Navstar 75Medium Earth Orbit31 Oct, 2015
Navstar 74Medium Earth Orbit15 Jul, 2015
Navstar 73Medium Earth Orbit25 Mar, 2015
Navstar 72Medium Earth Orbit29 Oct, 2014
Navstar 71Medium Earth Orbit02 Aug, 2014


Satellite NameOrbit Date
NVS-01Geostationary Orbit (GEO)29 May, 2023
IRNSS-1IInclined Geosynchronous Orbit (IGSO)12 Apr, 2018
IRNSS-1HSub Geosynchronous Transfer Orbit (Sub-GTO)31 Aug, 2017
IRNSS-1GGeostationary Orbit (GEO)28 Apr, 2016
IRNSS-1FGeostationary Orbit (GEO)10 Mar, 2016
IRNSS-1EGeosynchronous Orbit (IGSO)20 Jan, 2016
IRNSS-1DInclined Geosynchronous Orbit (IGSO)28 Mar, 2015
IRNSS-1CGeostationary Orbit (GEO)16 Oct, 2014
IRNSS-1BInclined Geosynchronous Orbit (IGSO)04 Apr, 2014
IRNSS-1AInclined Geosynchronous Orbit (IGSO)01 Jul, 2013