l16_software - Satellite Systems Software Col John Keesee...

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Satellite Systems Software Col. John Keesee MIT Dept. of Aero/Astro 19 October 2003
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Outline • Definitions Software design process Design rules Software costing
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Space System Software Spacecraft computer systems and their software provide unprecedented capability on orbit, but drive system cost and complexity
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Computer System Definitions Embedded System – Built-in processor providing real time control Real-Time processing – Handling or processing data at the time events occur Hard Real-Time – Precise timing required to avoid severe consequences
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Computer System Definitions Soft Real-Time – Tasks must be completed in a timely manner, but missing a time boundary has minor consequences Operating System Software – Manages the computer’s resources (e.g. I/O, memory) Application Software – Mission-specific software related to the user instead of the support of the computer
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Types Of Software Application Software : Operating System Software: Higher level functions that are Low level functions that provided to meet mission bridge application software requirements. to processing hardware. Communications - Executive or run-time control Attitude and Orbit - Kernel functions Determination and Control - Input/Output (I/O) device handlers Navigation - Built in Test (BIT) Autonomy - Math Utilities Fault Detection Mission Management Payload Management Continues to increase as •Usually will not increase requirements “creep” and after CDR. problems are encountered.
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Computer Resource Estimation Define processing tasks Application software PDR - Operating system functions Estimate software size and throughput Establish a cost for spacecraft software Evaluate development and test requirements Create funding profile for development and test computers and equipment. Identify life-cycle support costs On-orbit operations and support CDR - Upgrades, enhancements, modifications, sequence verification Combine resource/asset estimations to include all costs
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Computer Resource Estimation
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Functional Partitioning Between Space and Ground – Timing -Bandwidth Autonomy -Human Interaction Between Hardware and Software – Performance -Complexity Well-Defined Requirements -No Changes Between Bus and Payload – Duration
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