2.1.1 IRD:CS-CS-1: Inter-Spacecraft Interfaces
Document/Purpose IRD IOR Capable Chaser (ICAC)/SV ↔︎ IOR Cooperative Target (ICOT) Traceability (Upstream /Downstream) Documents Upstream: 1.8 Boundaries and Interfaces Downstream: ICD Status DRAFT – Ready for Review Baseline Version/Date Current Version Not yet established | v0.1 11 Apr 2026 Last Updated 11 Apr 2026 Owner / Lead Sanjay Chadha Contributors Reviewers Scope/Out-Of-Scope Scope: […]
2.1. Interface Requirements Documents
1.2.1.1 IRD:CS-CS-1: Inter-Spacecraft Interfaces
2.0 Interface Documents
1.2.1 Interface Requirements Documents 1.2.1.1 Inter-Spacecraft Interfaces
FAQ: In-Orbit Refueling Systems Initiative
Below are the questions we have been asked. If you query is not addressed, please send to: ior.project@reliqai.com Q1: What kind of details can you share about your new initiative? A1: This IOR initiative is a systems engineering architecture study focused on in-orbit refueling (IOR). It structures the problem from mission context and operational scenarios […]
1.11.0 Terminology and Definitions
[doc_toc] IOR Client satellite cooperation capability Levels This initiative defines 4 level of cooperation capability levels for space crafts: Interface Enabled Satellite provides a compatible physical refueling interface allowing propellant transfer but does not actively participate in refueling operations. IOR Aware In addition to the physical interface, the satellite provides telemetry feedback to its ground […]
1.9.5 Space Technical Knowledge
Propellants Electric Propulsion Propellants (Noble Gases) Primary propellants: Xenon Krypton Why? Used by almost all modern LEO constellations Increasingly used in GEO satellites Very high efficiency (high Isp) Ideal for orbit raising + station keeping Compatible with all-electric satellite platforms Storable Chemical Propellants (Hypergolic Family) Primary combinations: MMH + NTO UDMH + NTO Why still […]
1.9.4: Terms & Conditions, Timeline and License
Terms and Conditions Project Artifacts & Structure: Confluence and Jira are the source of truth. Web pages manage the review process. Contributor: Two contributors assist in Confluence/Jira updates based on their systems engineering and space project experience, and based on review comments. Reviewer: Reviewers post comments on IOR work pages. Comments, based on merit and […]
1.9.6 In-Orbit Refueling (IOR) Architectural Initiative
What Is This Project The IOR Architectural Initiative is an eight-week systems engineering project created to deliver a structured architectural decomposition of an In-Orbit Refuelling (IOR) system. Phase I applies a disciplined systems engineering process to define mission context, capture requirements, and develop a coherent system architecture. The initiative is vendor-neutral. Phase II, if pursued, […]
1.9.3 References
Normative References CONFERS: https://satelliteconfers.org/page/technical-committee-contributions CONFERS: Recommendations for Prepared In-Space (Re)Fueling Systems for Storable Propellants CONFERS: Recommendations for Best Practices, Functional Requirements, and Norms for In-space Servicing, Assembly, and Manufacturing (ISAM) Power and Data Interfaces NASA RPOD – https://www.nasa.gov/reference/jsc-rendezvous-prox-ops-docking-subsystems/ MERL – Safe and Constrained Rendezvous, Proximity Operations, and Docking- https://www.merl.com/publications/docs/TR2024-016.pdf Catapult – RPOD CONOPS https://d11avd6t8zdcx0.cloudfront.net/uploads/2025/09/RPOD-Report-v2.pdf Standards […]
1.9.2 Acronyms, Terms & Definitions
Acronyms AR&C – Autonomous Rendezvous and Capture. DSO – Dynamic Space Operations. ECEF – Earth-Centered Earth-Fixed. Used for ground locations. ECI – Earth Central Inertial – uses for orbits, spacecraft trajectory. GGNS – Guidance, Navigation and Control System. GN&C – Guidance Navigation and Control. T&M – Telemetry and Monitoring. ISAM – In-space Servicing, Manufacturing, and […]