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Celestia Satellite Test & Simulation (C-STS)
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Celestia - Optical Digital Converter for High-Speed Data Reception

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The Optical Digital Converter (ODC) provides reception and processing functionality of digital bitstreams output by free-space optical (FSO) receiver modules, capable of receiving data rates of up to 10Gbps.

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The ODC is ideal for use in FSO terminals, optical communication ground stations and for use in experimental setups for optical communication.

The ODC provides all required power, TM/TC and digital bitstream interfaces to the FSO receiver. The ODC provides the electrical, data extraction, protocol/data handling (incl. FEC) and status annotation functions. The digital bitstream interface to the FSO receiver is through an industry standard SFP+ interface, which supports both copper and optical fibre connections. The recovered data is offloaded from the ODC using a dedicated 10Gbit TCP/IP streaming interface (SFP+, optical or copper) to a commercial server platform for data storage to local disks (SSD or HDD).

The system consists of a 19″ 2U rack-mountable unit that is controlled and monitored by a software application that allows the system to be used stand-alone or controlled remotely via a Central-Check-Out System (CCS).

The ODC can be upgraded with custom data processing (such as forward error correction decoding, protocol handling, deciphering, etc.) to support the needs of the program/project. Using the available time synchronisation inputs (PPS and IRIG), the ODC maintains an accurate hardware time (CUC) that is used to timestamp the received data as well a housekeeping telemetry as received from the FSO receiver. The ODC supports multiple data processing images. The data storage interface is implemented using a low-latency TCP/IP stack directly within the hardware, capable of providing near line speed data streaming. This provides back-end independence, allowing commercialservers with standard 10G ethernet cards to be used. The ODC can be delivered with back-end software (Windows Server 2012/2020) for data storage /archiving.