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1.2.2 Mission Requirements

    Document/Purpose Defines the mission-level requirements the IOR system must satisfy to achieve the mission objectives.

    Reference: https://www.linkedin.com/pulse/mission-system-requirements-whats-difference-why-does-alan-fromberg-felkc/
    Traceability (Upstream /Downstream) Documents Upstream: Stakeholder Requirements
    Downstream: CONOPS, System Requirements
    Status DRAFT
    Baseline Version/Date | Current Version Not yet established | v0.1
    Last Updated  
    Owner / Lead
    Contributors
    Reviewers
    Scope/Out-Of-Scope Scope: Mission level requirements for the IOR capability and outcomes
    Out-of-Scope: How the IOR system delivers i.e. System Requirements.

    Table of Contents

    Mission vs System Requirements Governance

    A. Mission Requirements (MISR) Governance Rules

    How to manage duplicity of MISR. Use the following rules to reduce duplicity:

    1. Strict Structure must be followed
      1. Subject (The Mission)
      2. Action (shall enable / support / achieve)
      3. Object
      4. Constraint (if applicable)
    2. Identify the right Category and Subcategory for the MISR. When creating the requirement Category and Subcategory are attributes of each requirement. Category is part of the Requirements ID. Subcategory is optional and is attribute of the requirement which can be changed after requirement is created.
    3. Traceback

    Unstructured requirements shall NOT be accepted.

    B. Mission Requirements vs System Requirements

    Mission Requirements define the external capabilities the system must deliver.

    Stakeholder Needs + Mission Context (operational context, business objectives) → Mission Requirements

    System Requirements define what the system must do to satisfy the Mission.

    Mission Requirements + Operational Scenarios (CONOPS) + Constraints (Safety / Regulatory / Interface / Environmental) → System Requirements

    Mission Requirements

    Operational Requirements

    Requirement ID Summary Linked Issues
    IOR-MISR-OPER-2 The IOR mission shall support servicing of cooperative client spacecraft operating in Low Earth Orbit (LEO)
    IOR-MISR-OPER-3 The IOR mission shall support repeated servicing of multiple client spacecraft within the defined LEO service region. STKR-9 , STKR-1
    IOR-MISR-OPER-4 The IOR mission shall support scalable servicing operations for large LEO constellations. STKR-12
    IOR-MISR-OPER-10 The IOR mission shall provide standardized operational communication interfaces between client mission operations systems and the IOR mission operations system to enable coordinated planning.
    IOR-MISR-OPER-11 The IOR mission shall support the development, adoption, or use of standardized propellant refueling interfaces enabling servicing across multiple satellite platforms.
    IOR-MISR-OPER-12 The IOR mission shall support servicing of client spacecraft across the defined cooperation capability levels: Interface Enabled, IOR Aware, and IOR Cooperative spacecraft.
    IOR-MISR-OPER-13 The IOR mission shall enable guided rendezvous, proximity operations, docking, and propellant transfer operations with client spacecraft across the defined cooperation capability levels.
    IOR-MISR-OPER-14 The IOR mission shall enable autonomous rendezvous, proximity operations, docking, and propellant transfer operations with client spacecraft across the defined cooperation capability levels.
    IOR-MISR-OPER-15 The IOR mission shall support standardized refueling interfaces on IOR propellant depots enabling compatible third-party propellant delivery systems to replenish depot propellant.
    IOR-MISR-OPER-16 The IOR mission shall support standardized propellant transfer interfaces enabling IOR servicing systems to transfer propellant to compatible propellant depots.
    IOR-MISR-OPER-17 The IOR mission shall support standardized rendezvous, proximity operations, and docking procedures for interaction with IOR propellant depots.

    Performance Requirements

    Requirement ID Summary Linked Issues
    IOR-MISR-PERF-5 The IOR mission shall support a minimum operational service life of 15 years from first customer servicing event. STKR-6
    IOR-MISR-PERF-6 The IOR mission shall enable a minimum lifecycle cost reduction target of 60% for LEO spacecraft owners relative to full replacement. STKR-7
    IOR-MISR-PERF-7 The IOR mission shall achieve propellant utilization efficiency consistent with the defined economic performance objectives MISR-9

    Safety Requirements

    Requirement ID Summary Linked Issues
    IOR-MISR-SAFT-8 The IOR mission shall execute proximity and refueling operations consistent with “do no harm” principles including collision avoidance, contamination control, and debris mitigation. STKR-13 , STKR-1
    IOR-MISR-SAFT-18 The IOR mission shall ensure safe termination or recovery of servicing operations under off-nominal conditions.

    Regulatory/Compliance Requirements

    Requirement ID Summary Linked Issues
    IOR-MISR-REGU-9 The IOR mission shall operate in compliance with applicable licensing, proximity operations, and orbital debris mitigation regulatory requirements. STKR-12 , MISR-7