COMMON BOARD DESIGN FOR THE OBC I/O UNIT AND THE OBC CCSDS UNIT OF THE STUTTGART UNIVERSITY SATELLITE 'FLYING LAPTOP'

摘要

As already published in another paper at DASIA 2010 in Budapest [1] the University of Stuttgart, Germany, is developing an advanced 3-axis stabilized small satellite applying industry standards for command/control techniques, onboard software design and onboard computer components. The satellite has a launch mass of approx. 120kg and is foreseen to be launched end 2013 as piggy back payload on an Indian PSLV launcher. During phase C the main challenge was the conceptual design for an ultra compact and performant onboard computer (OBC), which is able to support an industry standard operating system, a PUS standard based onboard software (OBSW) and CCSDS standard based ground/space communication. The developed architecture is based on 4 main elements (see [1] and Figure 4): 1.the OBC core board (single board computer based on LEON3 FT architecture), 2.an I/O Board for all OBC digital interfaces to S/C equipment, 3.a CCSDS TC/TM pre-processor board, 4.CPDU being embedded in the PCDU. The EM for the OBC core meanwhile has been shipped to the University by the supplier Aeroflex Colorado Springs, USA and is in use in Stuttgart since January 2011. Figure 2 and Figure 3 provide brief impressions. This paper concentrates on the common design of the I/O board and the CCSDS processor boards.