National Library of Medicine
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From IVA to EVA: Our Roadmap
From IVA to EVA: Our Roadmap
The development of autonomous robotic systems for space follows a logical progression from controlled environments to the harsh vacuum of space. This paper outlines the technical roadmap from Intravehicular Activity (IVA) to Extravehicular Activity (EVA) robotics.
Phase 1: IVA Operations
Initial deployment focuses on interior station operations. The controlled environment—shirt-sleeve atmosphere, consistent lighting, established infrastructure—provides an ideal testing ground. Tasks include cargo transfer, equipment inspection, and routine maintenance within pressurized modules.
Success metrics for this phase include reliability rates above 95%, successful autonomous navigation in cluttered environments, and safe operation in proximity to crew members.
Phase 2: Airlock Transitions
The second phase introduces robots to pressure transitions and thermal extremes while maintaining the safety of being tethered to station infrastructure. This phase validates sealing mechanisms, radiation-hardened electronics, and thermal management systems.
Phase 3: Limited EVA Operations
Initial external operations begin with highly constrained tasks: external inspections, handrail navigation, tool retrieval. Robots remain within direct line-of-sight of station cameras and operate under strict motion boundaries.
Phase 4: Full EVA Capability
The final phase enables autonomous operation outside the station with minimal human oversight. Tasks include satellite servicing, external repairs, and assembly operations. This requires advanced computer vision, redundant communications systems, and sophisticated failure recovery mechanisms.
Technical Challenges
Each phase presents unique challenges. IVA robotics must navigate dynamic environments and interact safely with crew. EVA systems must survive extreme temperatures (-150°C to +120°C), radiation, micrometeorite impacts, and atomic oxygen corrosion.
The timeline from Phase 1 to Phase 4 spans approximately 5-7 years, assuming successful completion of validation milestones and availability of flight opportunities.