1. International Docking System Standard (IDSS) - https://www.internationaldockingstandard.com/

1.1. IDSS Interface Definition Document (IDSS-IDD-Rev-F-July 2022)

The International Docking System Standard (IDSS) Interface Definition Document (IDD) establishes a standard docking interface to enable collaborative endeavors between the International space fairing community while also supporting possible crew rescue operations. The IDSS was developed by the ISS participating partners and first baselined in 2010, with the goal to support the following missions:

  • Visitation and other low Earth orbit (LEO) platforms.
  • Exploration missions beyond LEO.
  • Crew rescue.
  • International cooperative mission.

The IDSS is managed by a committee of cooperating international space agencies. In the future additional members are expected to be added to the committee and including participation by space industry. The committee addresses questions, evaluates implementations by programs, and considers proposed enhancements while looking forward to supporting the growing space architectures in LEO and beyond. As in-space and surface architectures expand and are developed, the committee will support additional standards development as needed. 



  • It's referred to as a standard, but it doesn't seem to be tied to a standards development organization (SDO).

2. International Deep Space Interoperability Standards - https://www.internationaldeepspacestandards.com/

2.1. International Avionics System Interoperability Standards (IASIS)

This document is focused on issues that drive system performance and on issues that most directly affect interoperability between systems. Care will need to be taken in designing and balancing bandwidth in support of time triggered, rate constrained, and best effort traffic on the network. This document is focused on how an Inter-Element Network allows communications between potential elements or spacecraft providers to assist in an integrated avionics architecture that allows for the incorporation of desirable attributes associated with a more open architecture.



  • It's referred to as a standard, but it doesn't seem to be tied to an SDO.
  • This is more like a standards profile, i.e. it specifies existing standards to use for specific applications rather than defining new standards.

2.2. International Rendezvous System Interoperability Standards (IRSIS)

The purpose of the IRSIS is to provide basic common design parameters to allow developers to independently design compatible rendezvous operations that will enable the interoperability of different spacecraft in cislunar and deep space environments for human exploration missions and associated interfaces. The focus of this document version is on cislunar space missions and provides a starting point for future deep space missions. Implementation of the Rendezvous Standards should lower development cost, decrease operational complexity, and improve safety and mission success within the Rendezvous, Proximity Operations and Capture/Docking phases in spaceflight missions. Standardizing operational philosophy, flight phases, and terminology helps to enable international partnerships and other collaborations.


2.3. International Thermal System Interoperability Standards (ITSIS)

All spacecraft require a thermal management system to maintain a tolerable thermal environment for the spacecraft crew and/or equipment. The purpose of this document is to state standards for when common fluids are employed in active external and internal coolant loops and agreed-to requirements for coldplates that interface directly to those coolant loops. Future revisions of the document will incorporate any additional content for deep space missions that is not already included. This standard supports reliability and commonality for cooling systems that work across elements, when there is agreement to utilize common coolant(s). This document also provides basic, common design parameters to allow developers to independently develop and/or provide compatible coldplates.


3. International Organization for Standardization (ISO) - https://www.iso.org

3.1. Space systems — Rendezvous and Proximity Operations (RPO) and On Orbit Servicing (OOS) (ISO 24330:2022)

This document establishes guiding principles and best practices at the programmatic level for all participants in the industry. These principles and practices establish the broadest boundaries for behaviour of participants in the RPO/OOS industry and precede more detailed standards. In principle, the document also covers both robotic and human space flight missions, but requirements are derived from robotic missions.

This document is applicable to a broad array of RPO/OOS industry participants from spacecraft equipment manufacturers, spacecraft operators, service providers, developers of RPO/OOS simulation, planning and safety tools, and insurers. It helps to establish responsible norms of behaviour for RPO and OOS that industry participants are supposed to achieve and to promote throughout the global industry.