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Enabling international data relay at Mars 14th

Enabling international data relay at Mars

引用

14th International Conference on Space Operations, SpaceOps 2016

作者： Wenkert, Daniel D. Gladden, Roy E. Edwards, Charles D. Schmitz, Peter Denis, Michel Winton, Alistair J. Cross Mission System Development and Implementation Group Jet Propulsion Laboratory California Institute of Technology Mail Stop 264-235 PasadenaCA90027 United States Jet Propulsion Laboratory California Institute of Technology Mail Stop 264-235 PasadenaCA90027 United States Solar and Planetary Missions Division OPS-OPE European Space Operations Center European Space Agency Darmstadt Germany Solar and Planetary Missions Division OPS-OPM European Space Operations Center European Space Agency Darmstadt Germany ExoMars Systems Engineering SRE-PEG European Space Research and Technology Centre European Space Agency Noordwijk Netherlands

ISBN: (数字)9781624104268

ISBN: (纸本)9781624104268

The most commonly used mode of communications between Earth and a Mars surface mission is ultra-high frequency (UHF) radio relay via a Mars orbiter. There are four orbiters and two surface rovers operating at Mars and by October there will be five orbiters and three landers or rovers. There has been some collaboration between ESA’s Mars Express orbiter and NASA’s rovers, but 2016 is when Mars relay becomes fully international. In October, ESA will deliver the ExoMars Trace Gas Orbiter (TGO) and Entry, Descent, and Landing (EDL) Demonstrator Module (EDM) lander to Mars. The ExoMars program includes both ESA and ROSCOSMOS, with NASA participation (the Electra UHF transceiver on TGO). NASA orbiters will provide relay for EDM and future ESA Mars landers and rovers. TGO will provide relay for NASA's current and future surface assets (as Mars Express will continue to do). International collaboration is enabled in several steps. At the instruction of the space agencies, the Mars mission projects negotiate and write a "Service Agreement." This describes at a high level how a new Mars orbiter will operate with its corresponding surface missions or how a new surface mission will operate with its corresponding orbiters. It includes the roles of the different projects, how the new mission will communicate with existing or planned missions, the general flow of data and commands, and the capabilities or requirements of the new mission. After completing the Service Agreement, the projects write Interface Control Documents (ICDs), each of which describes data and command flow in greater detail and quantitative aspects of the relay link and operations timeline between an orbiter and a corresponding lander/rover. Interfaces and operations are tested before a new mission arrives at Mars. Once at Mars, a new orbiter will perform some "practice" relay contacts with its partners. For a new lander (e.g. EDM), relay operations generally begin before atmospheric entry at Mars, with recordin

关键词： NASA

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Rule-based flight software cost estimation

Rule-based flight software cost estimation

引用

AIAA SPACE Conference and Exposition, 2015

作者： Stukes, Sherry A. Spagnuolo, John N. Jet Propulsion Laboratory California Institute of Technology United States Cross Mission System Development And Implementation 4800 Oak Grove Drive/301-270 PasadenaCA91109 United States Engineering Cost Estimation 4800 Oak Grove Drive/301-465 PasadenaCA91109 United States

ISBN: (数字)9781624103346

ISBN: (纸本)9781624103346

This paper discusses the fundamental process for the computation of Flight Software (FSW) cost estimates. This process has been incorporated in a rule-based expert system [1] that can be used for Independent Cost Estimates (ICEs), Proposals, and for the validation of Cost Analysis Data Requirements (CADRe) submissions. A high-level directed graph (referred to here as a decision graph) illustrates the steps taken in the production of these estimated costs and serves as a basis of design for the expert system described in this paper. Detailed discussions are subsequently given elaborating upon the methodology, tools, charts, and caveats related to the various nodes of the graph. We present general principles for the estimation of FSW using SEER-SEM as an illustration of these principles when appropriate. Since Source Lines of Code (SLOC) is a major cost driver, a discussion of various SLOC data sources for the preparation of the estimates is given together with an explanation of how contractor SLOC estimates compare with the SLOC estimates used by JPL. Obtaining consistency in code counting will be presented as well as factors used in reconciling SLOC estimates from different code counters. When sufficient data is obtained, a mapping into the JPL Work Breakdown Structure (WBS) from the SEER-SEM output is illustrated. For across the board FSW estimates, as was done for the NASA Discovery mission proposal estimates performed at JPL, a comparative highlevel summary sheet for all missions with the SLOC, data description, brief mission description and the most relevant SEER-SEM parameter values is given to illustrate an encapsulation of the used and calculated data involved in the estimates. The rule-based expert system described provides the user with inputs useful or sufficient to run generic cost estimation programs. This system’s incarnation is achieved via the C Language Integrated Production system (CLIPS) and will be addressed at the end of this paper. © 2015, Ameri

关键词： Directed graphs

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