Contact Us

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