page 1, 03/15/2002© 2002 The Aerospace Corporation, All Rights ReservedArchitectural Approachesfor Multi-Mission Ground SystemsMichael HoganThe Aerospace CorpSession ChairGSAW 2002Session 10DBreakout GroupGSAW 2002GSAW 2002Session 10DSession 10DBreakout GroupBreakout Grouppage 2, 03/15/2002© 2002 The Aerospace Corporation, All Rights ReservedSession Goals•Definition of a Multi-mission SatelliteGround Control System (GCS):– System for controlling multiple families ofsatellites of different make/model•Session Goals– Identify key elements of a Multi-Mission GroundControl System– Understand how these elements support theMulti-Mission capabilitypage 3, 03/15/2002© 2002 The Aerospace Corporation, All Rights ReservedParticipantsSatellite Operators• Susan Kurtik, Jet Propulsion Laboratory• Tina Arechiga, PanAmSatGround System Vendors• David Allen, L-3 Communications/Storm Control Systems• Pete Gaffney, Integral Systems, Inc.Ground System Component Vendor• Robert Andzik, RT Logicpage 4, 03/15/2002© 2002 The Aerospace Corporation, All Rights ReservedSession Results•Multi-mission approach is preferred– Multiple dedicated systems were too costly– Valid at operations, systems & component level•Systems must be designed for upgrade– H/W & S/W Maintenance Problems– Personnel training and interest– Systems must support regression andoperations testing while in usepage 5, 03/15/2002© 2002 The Aerospace Corporation, All Rights ReservedSession Results, pg 2•Decouple Components– Isolate mission specific functions from core– Isolate hardware dependencies– Multiple versions of APIs support evolution– Supports layered, tailorable architecture•Use of Standards– Must be widely accepted• TCP/IP• CCSDS/SLE•CORBA– Not too low levelpage 6, 03/15/2002© 2002 The Aerospace Corporation, All Rights ReservedSession Results, pg 3•Distributed Architectures– Architectural flexibility– Hardware independence/flexibility– Personnel and operations flexibility•COTS Components– Total COTS system is not possible– Need some in-house development to keepmaintainers trained/interested– Node-locked licenses inhibit s/w