By Jens Eickhoff (auth.), Jens Eickhoff (eds.)
This publication describes the advance and layout of a distinct mixed info and gear administration infrastructure The use in small satellites provides a few specific standards to the structures like power failure robustness and dealing with of other sorts of exterior analog and electronic interfaces. those necessities result in a sensible merge among On Board laptop and the satellite's energy keep watch over and Distribution Unit, which ends up in a truly leading edge layout or even a patent association. This publication offers method engineers and college scholars with the technical wisdom as combine among technical brochure and a person guide.
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Extra info for A Combined Data and Power Management Infrastructure: For Small Satellites
The CCSDS telecommand decoder provides the entire functionality of reassembling TCs from NRZ-L CLTU level coming from 18 J. Eickhoff receiver side up to Telecommand Frame content. It identifies hardware commands to be routed to PCDU’s Combined-Controller. The special implementation selected here is not based on marking HPCs by MAP-ID, but via dedicated Virtual Channels. In the presented CDPI implementation the hardware commands will be routed to the PDU via an RS422 interface link and the CPDU functionality is implicitly covered by the Combined-Controller of the PCDU.
Fig. 12 Processor-Board oscilloscope plot of the PPS signal. Ó Aeroflex Inc. 0000500 One Second Pulse Reset: There is a signal connected to LEON3FT GPIO 15 and routed to the FPGA that is used to reset the one second pulse. The minimum pulse width in order to reliably reset the one second pulse is two system clock cycles. 4 Watchdog Signal and LEON3FT Reset The LEON3FT has a watchdog trip signal on chip and the OBC processor routes that signal to the FPGA. When enabled, the logic inside the FPGA will use the watchdog signal trip to reset the LEON3FT.
The same applies to the assembly of the OBC from the individual frames and the integration of OBC and PCDU into the overall CDPI. These steps have been performed by the IRS in the cleanroom facilities of the ‘‘Raumfahrtzentrum Baden-Württemberg’’ in Stuttgart. 17 depicts the CDPI assembly Flight Model of the FLP satellite in the IRS cleanroom. The setup here consists of the 2 separate housings of OBC and PCDU, ready for connecting cabling of: • OBC Telemetry output and Telecommand input lines to/from satellite transceivers respectively bypass • Control lines from OBC to PCDU for normal control of power functions and for control of the PCDU’s analog RIU functions • OBC watchdog lines to the PCDU Common-Controller • HPC lines for PCDU commanding from ground via CCSDS decoders.