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SIDLOC (Spacecraft Identification and Localization) is an experiment from Greek non-profit the Libre Space Foundation (LSF). Their goal with the project is to help make space safer by speeding up the process of identifying space missions, from satellites to space probes and space stations.

Attached to the upper stage of the Ariane 6, the 63 x 63 x 40 mm SIDLOC experiment’s mission is to build an ‘open standard protocol’ to easily, automatically and accurately identify and locate spacecraft. It will do this via a radio-transmitted beacon, tracked and decoded by a network of open-source ground stations, software and hardware.

SIDLOC will transmit a broad-spectrum signal deliberately spread out over a large radio bandwidth. Information carried in the signal comes in a standard ‘schema’ – a structure and format consisting of binary data that is modulated to add all the necessary information about the spacecraft to the signal. The structured data format thus allows for the spacecraft's rapid identification and localisation.

On Earth, the SatNOGS Network – a global network of open-source ground stations – will receive the signal and demodulate the data, including the spacecraft's ID, and using the Doppler effect will identify the spacecraft's location.