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Design and Qualification of Twelve Meter Spacewire Flexible PCB Backplane for a Space Robotics Servicer

NRL researchers recently designed and built a SpaceWire link over a flexi-cable which is more than three times as lossy (in decibels per meter) as a cable constructed to section 5.2 of the SpaceWire specification. The length and lossy nature of this flex-cable made closing a SpaceWirelink at our requirement of 100Mbps exceptionally difficult. Significant testing and analysis were undertaken before settling on an implementation that uses LVDM drivers in place of the LVDS called out in the SpaceWire specification in order to close a link at up to 200Mbps. This paper describes the advantages SpaceWire brings to the RSGS payload and the significant analysis, simulation, and testing needed to design and qualify a SpaceWire link to transmit data at up to 200 Mbps over this twelve-meter flex-cable.