Are the Clouds Clearing on the Ground? Redesigning Ground Segments for Secure Constellations

Cloud-native ground segments have played a central role in enabling scalability, flexibility, and automation for modern satellite constellations. By leveraging elastic infrastructure and cloud-based services, operators have been able to support increasingly complex missions with smaller teams and shorter development cycles. However, cloud-native design is often implicitly equated with cloud-dependent deployment, a coupling that is increasingly being questioned as space systems assume defense and security-critical roles.

As sovereignty, security, and regulatory requirements intensify, many constellation operators are reconsidering where and how their ground infrastructure runs. In several cases, this has led to renewed interest in on-premises or sovereign deployments, even for ground segments originally designed to operate in public cloud environments. This shift introduces a key architectural challenge: how can operators preserve scalability, automation, and operational agility while operating outside traditional cloud platforms?

This paper argues that these capabilities are not inherent properties of the cloud itself, but rather outcomes of specific architectural design choices. Drawing on lessons learned from a cloud-to-on-premises migration of a constellation ground segment, the paper examines which design principles enable portability across deployment environments and which assumptions create hidden dependencies. It discusses the role of modular architectures, clear system boundaries, and API-first design in decoupling operational logic from infrastructure, allowing ground segments to adapt to security-driven constraints without sacrificing automation or scalability.

By framing cloud-native capabilities as architectural outcomes rather than deployment characteristics, the paper provides guidance for designing ground segments that remain flexible across cloud, on-premises, and hybrid environments. This perspective is particularly relevant for future constellations operating at the intersection of commercial scalability and security-critical requirements.