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 […]
1.9 Appendix
Naming Convention OPCON Stages Examples OPC-LAUNCH OPC-ORBIT_INSERT OPC-STANDBY OPC-RENDEZVOUS OPC-PROXIMITY_OPS OPC-DOCKING OPC-PROP_TRANSFER OPC-UNDOCKING OPC-RETURN OPC-DISPOSAL Requirements IOR-<LEVEL>-<CATEGORY>-NNN LEVEL STKR = Stakeholder Requirement MISR = Mission Requirement SYSR = System Requirement DERR = Derived Requirement VERI = Verification Requirement HSWR – High Level Software Requirement LSWR – Low Level Software Requirement CATEGORY Discipline grouping OPEC = […]
1.8 Boundaries and Interfaces
Document/Purpose External and Internal Interfaces defined Traceability (Upstream /Downstream) Documents Upstream: Downstream: System Requirements Status DRAFT – Ready for Review Baseline Version/Date Current Version Not yet established | v0.1 04 Mar 2026 Last Updated 23 Mar 2026 Owner / Lead Sanjay Chadha Contributors Reviewers Scope/Out-Of-Scope Scope: System Design, System Requirements, System Analysis, Out-of-Scope: Physical Architecture […]
1.7 Physical Architecture
Document/Purpose Traceability (Upstream /Downstream) Documents Upstream: Downstream: Status pre-DRAFT WORK ON THIS SECTION HAS NOT STARTED. Baseline Version/Date | Current Version Not yet established | v0.1 04 Mar 2026 Last Updated 07 Mar 2026 Owner / Lead Sanjay Chadha Contributors Reviewers Scope/Out-Of-Scope Scope: Out-of-Scope: Key Summary T Created Updated Assignee Reporter Status STKR-46 […]
1.6 Logical Architecture
Document/Purpose Traceability (Upstream /Downstream) Documents Upstream: 1.5 Functional Architecture and Activities Downstream: 1.7 Physical Architecture Status Pre-DRAFT Baseline Version/Date | Current Version Not yet established | v0.1 04 Mar 2026 Last Updated 07 Mar 2026 Owner / Lead Sanjay Chadha Contributors Reviewers Scope/Out-Of-Scope Scope: Out-of-Scope: [doc_toc] IOR Service Provider (ISP) Ground Segment (GS) The IOR Service […]
1.5 Functional Architecture and Activities
Document/Purpose Traceability (Upstream /Downstream) Documents Upstream: 1.3 Concept of Operations (CONOPS) Downstream: 1.4 System Requirements, 1.6 Logical Architecture Status Pre-DRAFT Baseline Version/Date | Current Version Not yet established | v0.1 04 Mar 2026 Last Updated 22 Mar 2026 Owner / Lead Sanjay Chadha Contributors Reviewers Scope/Out-Of-Scope Scope: System Design, System Requirements, System Analysis, Out-of-Scope: Physical […]