CesiumAstro
CesiumAstro designs, manufactures, and tests software-defined active phased array communication systems and satellites for space, airborne, and ground applications. Its modular, reconfigurable payloads support inter-satellite links, high-speed data downlinks, lunar communications, multi-beam connectivity, and 5G NTN networks, with a vertically integrated approach spanning custom silicon to complete spacecraft.
- Space Technology
- Telecommunications
- Defense Tech
- Semiconductor
- Hardware
- Artificial Intelligence
- Aerospace
- Software Only
Funding
Raised to date
$1.1BRaised to date based on public sources. This may differ from the amount the company actually raised and is based only on what is publicly available on the internet.
across 7 rounds
+16$730M · Series D
Announced Nov 2026
Disclosed cumulative: $1.1B
Founders
Founder details are not available yet.
Product
Problem
Traditional satellite and airborne communication systems rely on rigid, hardware-defined architectures that cannot dynamically adapt to changing mission needs or evolving communication standards. Frequency and beam adjustments typically require hardware modifications, leading to increased costs, delays, and limited operational flexibility for proliferated space and defense networks.
Solution
CesiumAstro provides software-defined active phased array communication systems and satellites that enable on-orbit reconfigurability and dynamic frequency-to-beam allocation. The company's vertically integrated platform spans custom silicon, active phased arrays, software-defined payloads, advanced processors, spacecraft, mission software, and ground terminals, allowing system-wide performance optimization. Its technology supports inter-satellite links, high-speed data downlinks, lunar communications, multi-beam connectivity, and 5G NTN networks across commercial, government, and national security missions. The company is also developing Synchronicity, a planned 737-satellite, AI-enabled constellation with multi-beam, multi-frequency architecture supporting Ku-, Ka-, and V-band communications and edge computing.
Target Audience
Primary customers include commercial and defense organizations requiring high-throughput, flexible communication solutions for space and airborne applications, including government agencies, satellite operators, and national security programs.
Features
- Software-defined active phased array payloads supporting L- through V-band frequencies with dynamic frequency-to-beam allocation
- On-orbit reconfigurability enabling real-time adaptation of coverage areas and support for evolving mission requirements
- Flexible beam management with beam-steering and beam-hopping capabilities for improved spectrum utilization and jam resistance through pattern nulling
- Vertically integrated technology stack including custom RF System-on-Chip semiconductors, digital beamforming, and advanced mixed-signal processing
- AI-enabled network optimization, autonomous satellite operations, and reconfigurable edge compute for time-sensitive applications
- Compact, flat-panel form factor with thermal management that spreads heat across the full array surface
- Modular architecture supporting scalability across satellites, aircraft, ground networks, and emerging space architectures
- Flight-proven Element satellite platform with on-orbit operations and eight secured SpaceX rideshare launches