Research
The methods behind the network, with their evidence and open questions.
Catalog · Edition 2.3
A measured orbital catalog for Space Data Network, built from public and login-only sources. Each object gets the solution with the best measured accuracy, with a covariance set from its measured error. Includes accuracy by object class against independent orbits, the Chinese AOE catalog beside Space-Track, an open drag correction solved from fleet orbits, and maneuver detection.
Conjunctions · Edition 1.9
How Space Data Network checks every tracked object against every other for close approaches: the full catalog over three days in about 20 seconds with SGP4, on a GPU or on ordinary processors, and in about two hours on 16 cores with full-force numerical propagation. Includes agreement with SOCRATES, where collision probabilities are calibrated, why screening on the uncertainty region stays safe when the covariance is large, and private screening on encrypted orbits.
Provenance · Edition 1.0
What makes Space Data Network's catalog and screening results traceable, checkable and safe to share: records that keep every source, signed and content-addressed publication, screening work that replicas verify byte for byte, and keys secured by an economic bond.
Security
Cryptocurrency balances at addresses derived from a key act as continuous, public proof that the key is intact. An attacker who steals the key takes the funds, so funds that stay put mean a key that has not been stolen.
