As engineers continue to develop new technologies for the space industry, RISC-V is rapidly emerging as the mainstream architecture for space-bound processors. What challenges do engineers face when creating processors for space, what was discussed at the RISC-V Summit Europe, and why is RISC-V the obvious choice for the next generation of space missions?
What Challenges Do Engineers Face with Space-Bound CPUs?
When it comes to using electronics in space, the challenges faced are countless. Intense radiation can interfere with the normal operation of a device, flip bits in memory, trigger single-event upsets, or even permanently damage sensitive transistors. Powerful magnetic fields can upset delicate sensors and electronic systems, while enormous temperature swings can cause repeated expansion and contraction of materials, all while making thermal dissipation extremely difficult. Simply put, space is one of the harshest environments engineers can design for. When it comes to computational devices, however, the challenges go even further. Any processor destined for space must not only survive these harsh conditions but continue operating reliably for years, often without any possibility of repair. As such, commercial off-the-shelf processors found in consumer electronics are generally unsuitable for space applications, as they simply cannot withstand the radiation and environmental stresses encountered beyond Earth's atmosphere. Instead, engineers are often forced to rely on dedicated or custom processor designs specifically developed for spaceflight. These processors require increased radiation hardening, improved reliability under extreme operating conditions, and perhaps most importantly, support instruction set architectures that have already proven themselves in demanding environments. The result is that engineers have historically had relatively few architectures to choose from. One of the most successful has been PowerPC, which has seen widespread deployment across numerous space missions thanks to its performance, maturity, and resilience when implemented in radiation-hardened designs. Another long-standing option has been MIPS. Its relatively simple architecture, low power consumption, and scalability have made it attractive for a variety of embedded and aerospace applications over many years. However, while both PowerPC and MIPS have demonstrated their suitability for spaceflight, they suffer from a common limitation. Both are proprietary architectures with limited cross-compatibility, meaning engineers often become locked into ecosystems that may not be ideally suited for future missions. This lack of openness also makes it considerably more difficult to design custom processors around these architectures without licensing agreements, significant investment, and long-term vendor commitments. For organizations looking to innovate or tailor processors to highly specialized missions, these restrictions can become a major obstacle.
RISC-V Summit Standardises Space Use
Recognizing these challenges, representatives from across the global space industry gathered at the 2026 RISC-V Summit Europe to discuss the growing adoption of RISC-V as the next standard architecture for space computing. Speakers from organizations including the European Space Agency, NASA JPL, Microchip, and Frontgrade Gaisler all highlighted how RISC-V is rapidly becoming the preferred architecture for future space processors thanks to its open nature, scalability, and growing software ecosystem. Historically, space agencies have often favored architectures that could be independently verified, modified, and maintained throughout missions that may last decades. This was one of the reasons SPARC became so popular within the European space industry, with the ESA-backed LEON processor family becoming one of the most widely used processor designs for satellites and scientific spacecraft. However, these legacy architectures are becoming increasingly difficult and expensive to maintain. As SPARC and PowerPC age, finding expertise, maintaining software ecosystems, and developing new processor generations becomes increasingly challenging. RISC-V offers a modern, open, and readily available 64-bit architecture that significantly reduces both technical debt and long-term development costs. Frontgrade Gaisler demonstrated this transition through its NOEL processor family and its upcoming radiation-hardened eight-core GR765 processor. One particularly interesting feature of the GR765 is its ability to boot in either SPARC or RISC-V mode, allowing existing spacecraft software to remain compatible while providing a migration path towards a fully RISC-V ecosystem. The company also emphasized the importance of open ecosystems and interoperability. By releasing basic processor implementations as open source while maintaining compatibility with the RISC-V standard, customers can avoid vendor lock-in while benefiting from long-term software and hardware support. Microchip also showcased its contribution through NASA's High-Performance Spaceflight Computing (HPSC) program. Built around the company's PIC64-HPSC processor featuring eight RISC-V cores, the platform is designed to dramatically increase onboard computing capability while improving networking, cybersecurity, and autonomous decision-making for future deep-space missions. Beyond government agencies, commercial space companies are also increasingly embracing RISC-V. As satellite constellations, orbital computing platforms, onboard AI processing, and next-generation communications systems become more demanding, the need for highly customizable processors continues to grow. Overall, industry participants expect RISC-V to become a foundational architecture for future space infrastructure, including satellite networks, orbital data centers, advanced communications platforms, and both commercial and government space programs.
Why is RISC-V the Obvious Choice for Space?
When comparing all of the processor architectures currently used in spaceflight, to me there really is no contest. RISC-V is the obvious choice for engineers developing the next generation of space hardware. The biggest advantage comes from the flexibility that RISC-V offers. Engineers are free to design processors that remain fully compatible with the standard while incorporating application-specific modifications for individual missions. Whether the goal is improved fault tolerance, AI acceleration, enhanced security, or specialized interfaces, RISC-V allows designers to build exactly what they need without abandoning software compatibility. As software support for RISC-V continues to expand, these custom processors can move from development to deployment with far fewer obstacles than proprietary architectures. There are no expensive licensing fees, no need to choose between competing proprietary ISAs, and no requirement to lock an entire project into a niche ecosystem that may disappear years later. Another major benefit is the growing pool of engineering talent. Universities, research institutions, and commercial organizations around the world are increasingly teaching and developing for RISC-V, meaning there is a steadily expanding workforce capable of designing both hardware and low-level software around the architecture. Its open nature also encourages competition. Rather than relying on one or two companies to develop specialized space processors, multiple organizations can build compatible RISC-V solutions, accelerating innovation while helping to reduce long-term costs. Perhaps most importantly, space programs can benefit from an architecture that is actively being developed, openly maintained, backwards compatible, and supported by an increasingly mature software ecosystem. This gives mission designers confidence that today's processors will remain relevant well into the future. Looking even further ahead, future space infrastructure is likely to become increasingly modular and serviceable, particularly as long-duration human missions become a reality. Having a processor architecture that can be replicated, customized, upgraded, or replaced without depending on a single vendor is exactly the kind of flexibility future space exploration will require. For all of these reasons, RISC-V is rapidly becoming more than simply another processor architecture. It is positioning itself as the foundation upon which the next generation of spacecraft, satellites, orbital computing platforms, and deep-space missions will be built.
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