14.2.1 — Orbital Debris Monitoring — maturity: live

Debris Catalogue Generation

Building and maintaining a sovereign catalogue of orbital debris objects by fusing data from dedicated space-based radar and optical sensors with ground-based tracking networks.

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Every nation that operates satellites depends on conjunction warnings to keep those assets alive. Today, the authoritative catalogue is the US Space Surveillance Network's publicly released data via Space-Track.org — a dataset that is deliberately sanitised, deliberately delayed, and subject to political access controls. A sovereign operator that relies exclusively on that feed is, in effect, outsourcing the situational awareness on which its entire space programme depends to a foreign military.

A sovereign debris catalogue programme pairs a dedicated LEO radar-imaging constellation with a national network of ground-based optical and radio-frequency fence sensors to generate independent, unfiltered tracking data. Satellites carrying X-band or S-band phased-array radar illuminate the debris environment and generate tracks on objects down to roughly 10 cm in diameter. Ground sensors close coverage gaps in polar and high-inclination regimes. All observations are fused in a sovereign processing cluster running orbit-determination and association algorithms, producing a living catalogue with state vectors, uncertainty ellipsoids and conjunction probability estimates that are never redacted for diplomatic reasons.

The operational outcome is blunt: a national space agency or defence authority can issue manoeuvre advisories and collision-avoidance commands based on its own data, validated against — not derived from — external feeds. Nations with growing constellations in LEO also gain the ability to negotiate equitably in international debris-liability discussions, because they can produce credible, independently derived evidence. The catalogue also seeds the sibling capabilities in this subsection: active removal targeting, fragmentation forensics and density forecasting all depend on a trustworthy, sovereign object list as their foundation.

What matters

US Space-Track catalogue releases are officially acknowledged to omit classified objects and apply timing delays that can exceed 24 hours for sensitive conjunction events.
Conjunction probability is exquisitely sensitive to state-vector uncertainty; independently derived covariances from a sovereign sensor network reduce false-positive manoeuvre rates and prevent mission-life attrition from unnecessary burns.
The 1972 Liability Convention assigns fault on an object-by-object basis, so a nation that cannot independently attribute a debris piece is legally and diplomatically exposed after a collision.
A sovereign catalogue is a dual-use intelligence asset: the same radar tracks that protect civil satellites also reveal undeclared adversary objects and manoeuvre histories that no allied feed will ever share.

Sovereignty score: 9/10 — A nation that cannot independently catalogue orbital debris cedes the ability to protect its own satellites, attribute collisions, and participate as an equal in international space governance.

Geopolitical access risk: US Space-Track data access has been restricted or conditioned on diplomatic compliance in the past, and allied status is not a permanent guarantee of unredacted, real-time conjunction warnings.
Legal and liability exposure: without sovereign tracking records, a nation cannot independently reconstruct a collision event, defend against or prosecute a liability claim under the 1972 Convention, or prove attribution of a fragmentation event.
Operational dependency: manoeuvre decisions based on foreign-supplied state vectors with unknown redaction policies transfer effective command authority over a nation's own constellation to a foreign military organisation.
Supply-chain and export-control risk: high-performance space surveillance radar components — particularly T/R modules and signal processors — are subject to ITAR and EAR controls, requiring a deliberate industrial strategy using European, Israeli or domestic sources to avoid a single-nation chokepoint.

Reference architecture

Payload: S-band phased-array radar, 2 kW peak transmit power, coherent integration enabling detection of objects ≥10 cm at 600 km range; secondary wide-field optical telescope (15 cm aperture, 5° FOV) for GEO belt object detection and orbit determination in visible band
Bus class: ESPA-class microsat, 150–200 kg wet mass, 3-axis stabilised, 1 kW average payload power from deployable solar arrays; radar antenna deployed as a 1.5 m flat panel on a deployable boom
Orbit: Sun-synchronous LEO at 550–600 km altitude; 12-satellite walker constellation at 75° inclination providing global debris fence coverage with mean revisit of ≤60 minutes; 4 additional satellites in 98° dawn-dusk SSO for continuous polar coverage
Ground segment: National primary mission control and data reception station (S-band TT&C, X-band downlink at 400 Mbps); two geographically separated backup stations for high availability; national network of 6 ground-based optical sensors (0.5 m aperture, clear-sky night operations) and 2 VHF/UHF radar fence installations for independent orbit determination
Software & data
Latency
Cost band
Lead time

References

Space-Track.org — 18th Space Defense Squadron Catalogue — Space-Track publishes Two-Line Element sets for roughly 27,000 tracked objects but explicitly notes that the catalogue excludes classified objects and that data quality and latency vary by object sensitivity. It is operated by the US Space Force 18th Space Defense Squadron under US law.
ESA Space Debris Office — Annual Space Environment Report — ESA estimates approximately 36,500 objects larger than 10 cm are in orbit, with catalogued objects representing only a fraction of the debris population. ESA's own TIRA radar and optical network underpin Europe's independent Space Surveillance and Tracking (SST) capability.
IADC Space Debris Mitigation Guidelines — The Inter-Agency Space Debris Coordination Committee guidelines formalise the shared international responsibility for debris tracking and mitigation, but implementation remains a national prerogative with no binding enforcement mechanism for catalogue sharing.
ITU Radio Regulations — Space Research and Earth Exploration Satellite Service Allocations — ITU coordinates frequency assignments for space surveillance radars and acknowledges that adequate spectrum access for national SSA sensors is a prerequisite for independent debris catalogue generation.
UNOOSA — Long-term Sustainability of Outer Space Activities Guidelines — The UN Office for Outer Space Affairs Long-Term Sustainability guidelines call on states to develop or access space surveillance capabilities and to share conjunction data, implicitly recognising that nations without independent sensors are dependent on the goodwill of those that have them.