SIDLOC (Spacecraft Identification and Localization) aims to develop an open standard protocol for identifying and locating spacecraft automatically and accurately. The 63 x 63 x 40 mm device will be attached to the upper stage of Ariane 6 and will transmit a broad-spectrum signal containing binary data about the spacecraft. This data will be tracked and decoded by a network of open-source ground stations and software.

The signal, transmitted via a radio beacon, will be received by the SatNOGS Network, a global network of open-source ground stations. Using the Doppler effect, the network will demodulate the data to identify the spacecraft and determine its location.

The Libre Space Foundation initiated the SIDLOC project in 2021 after identifying several challenges in the space industry, including fast identification of spacecraft, system capacity, early functionality, and post-deployment activation. The project aims to address these issues, thereby enhancing safety and increasing mission success rates.

Rapid identification of missions in space reduces the number of unidentified objects, aiding collision avoidance and space traffic management. It also facilitates quick communication and control of spacecraft post-launch.

The Libre Space Foundation is committed to promoting free and open-source technologies for space. All its projects, including SIDLOC, adhere to open-source principles, making information and technology publicly available.

"This is one of the basic principles that fuels our vision - making space available to all humanity," explains Pierros Papadeas, Libre Space Foundation's Executive Director, "So, all Libre Space Foundation projects are open-source and strictly follow open-development methodologies. We believe this will increase SIDLOC's positive impact, which is why the hardware we integrate into the Ariane 6 upper stage is both open-source software and open-hardware licensed."

SIDLOC is expected to have an immediate impact on space safety by enabling fast and automatic localization and identification of spacecraft. As space activities increase, both in the public and private sectors, such technologies become crucial for maintaining space traffic management and collision avoidance.

"By enabling fast and automatic localisation and identification of spacecraft, our infrastructure can become more resilient and efficient, and this is how SIDLOC's impact can have a positive impact for all," concludes Manthos Papamatthaiou, Chairman of Libre Space Foundation and leader of the SIDLOC initiative.

"The SIDLOC experiment on Ariane 6 marks the debut of a technology poised to revolutionise Space Situational Awareness for years to come, potentially weaving itself into the very fabric of the space ecosystem."

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Spacecraft Identification and Localization
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