1. The U.S. “Space Policy Directive-3, National Space Traffic Management Policy” defines SSA as “the knowledge and characterization of space objects and their operational environment to support safe, stable, and sustainable space activities.” See https://www.whitehouse.gov/presidential-actions/space-policy-directive-3-national-space-traffic-management-policy/.
2. https://www.iadc-home.org/.
3. “Space Systems-Space Debris Mitigation Requirements,” ISO 24113:2019, International Organization for Standardization, July 2019.
4. “Space Debris Mitigation Guidelines of the United Nations Committee On The Peaceful Uses Of Outer Space”, United Nations General Assembly Resolution 62/217, 22 Dec 2007.
5. IADC Steering Committee, “IADC Statement on Large Constellations of Satellites in Low Earth Orbit,” IADC-15-03, September 2017.