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  • 1
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    Analyzing Spacecraft Telecommunication Systems (2004)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: Multi-Mission Telecom Analysis Tool (MMTAT) is a C-language computer program for analyzing proposed spacecraft telecommunication systems. MMTAT utilizes parameterized input and computational models that can be run on standard desktop computers to perform fast and accurate analyses of telecommunication links. MMTAT is easy to use and can easily be integrated with other software applications and run as part of almost any computational simulation. It is distributed as either a stand-alone application program with a graphical user interface or a linkable library with a well-defined set of application programming interface (API) calls. As a stand-alone program, MMTAT provides both textual and graphical output. The graphs make it possible to understand, quickly and easily, how telecommunication performance varies with variations in input parameters. A delimited text file that can be read by any spreadsheet program is generated at the end of each run. The API in the linkable-library form of MMTAT enables the user to control simulation software and to change parameters during a simulation run. Results can be retrieved either at the end of a run or by use of a function call at any time step.
    Keywords: Man/System Technology and Life Support
    Type: NPO-40298 , NASA Tech Briefs, August 2004; 15
    Format: application/pdf
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  • 2
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    Program for Editing Spacecraft Command Sequences (2006)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: Sequence Translator, Editor, and Expander Resource (STEER) is a computer program that facilitates construction of sequences and blocks of sequences (hereafter denoted generally as sequence products) for commanding a spacecraft. STEER also provides mechanisms for translating among various sequence product types and quickly expanding activities of a given sequence in chronological order for review and analysis of the sequence. To date, construction of sequence products has generally been done by use of such clumsy mechanisms as text-editor programs, translating among sequence product types has been challenging, and expanding sequences to time-ordered lists has involved arduous processes of converting sequence products to "real" sequences and running them through Class-A software (defined, loosely, as flight and ground software critical to a spacecraft mission). Also, heretofore, generating sequence products in standard formats has been troublesome because precise formatting and syntax are required. STEER alleviates these issues by providing a graphical user interface containing intuitive fields in which the user can enter the necessary information. The STEER expansion function provides a "quick and dirty" means of seeing how a sequence and sequence block would expand into a chronological list, without need to use of Class-A software.
    Keywords: Man/System Technology and Life Support
    Type: NPO-41175 , NASA Tech Briefs, September 2006; 58
    Format: application/pdf
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  • 3
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    Mission Scenario Development Workbench (2006)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: The Mission Scenario Development Workbench (MSDW) is a multidisciplinary performance analysis software tool for planning and optimizing space missions. It provides a number of new capabilities that are particularly useful for planning the surface activities on other planets. MSDW enables rapid planning of a space mission and supports flight system and scientific-instrumentation trades. It also provides an estimate of the ability of flight, ground, and science systems to meet high-level mission goals and provides means of evaluating expected mission performance at an early stage of planning in the project life cycle. In MSDW, activity plans and equipment-list spreadsheets are integrated with validated parameterized simulation models of spacecraft systems. In contrast to traditional approaches involving worst-case estimates with large margins, the approach embodied in MSDW affords more flexibility and more credible results early in the lifecycle through the use of validated, variable- fidelity models of spacecraft systems. MSDW is expected to help maximize the scientific return on investment for space missions by understanding early the performance required to have a successful mission while reducing the risk of costly design changes made at late stages in the project life cycle.
    Keywords: Man/System Technology and Life Support
    Type: NPO-41382. , NASA Tech Briefs, September 2006; 59
    Format: application/pdf
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  • 4
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    Mars Science Laboratory Mission scenario development workbench (2005)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Keywords: Lunar and Planetary Science and Exploration
    Type: IEEE Aerospace Conference; Mar 10, 2005; Big Sky, MT; United States
    Format: text
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  • 5
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    Evolutionary computing for the design search and optimization of space vehicle power subsystems (2004)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Evolutionary computing has proven to be a straightforward and robust approach for optimizing a wide range of difficult analysis and design problems. This paper discusses the application of these techniques to an existing space vehicle power subsystem resource and performance analysis simulation in a parallel processing environment. Out preliminary results demonstrate that this approach has the potential to improve the space system trade study process by allowing engineers to statistically weight subsystem goals of mass, cost and performance then automatically size power elements based on anticipated performance of the subsystem rather than on worst-case estimates.
    Type: IEEE Aerospace Conference; Mar 06, 2004 - Mar 13, 2004; Big Sky, MT; United States
    Format: text
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  • 6
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    DEGRA : a computer model for predicting long term thermoelectric generator performance (2006)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Keywords: Solid-State Physics
    Type: Space Technologies and Applications International Forum (STAIF); Feb 12, 2005 - Feb 16, 2005; Albuquerque, NM; United States
    Format: text
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  • 7
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    Space mission scenario development and performance analysis tool (2004)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: This paper discusses a new and innovative approach for a rapid spacecraft multi-disciplinary performance analysis using a tool called the Mission Scenario Development Workbench (MSDW). To meet the needs of new classes of space missions, analysis tools with proven models were developed and integrated into a framework to enable rapid trades and analyses between spacecraft designs and operational scenarios during the formulation phase of a mission. Generally speaking, spacecraft resources are highly constrained on deep space missions and this approach makes it possible to maximize the use of existing resources to attain the best possible science return. This approach also has the potential benefit of reducing the risk of costly design changes made later in the design cycle necessary to meet the mission requirements by understanding system design sensitivities early and adding appropriate margins. This paper will describe the approach used by the Mars Science Laboratory Project to accomplish this result.
    Type: IEEE Aerospace Conference; Mar 05, 2004; Big Sky, MT; United States
    Format: text
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  • 8
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    Simulating the Gradually Deteriorating Performance of an RTG (2008)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: Degra (now in version 3) is a computer program that simulates the performance of a radioisotope thermoelectric generator (RTG) over its lifetime. Degra is provided with a graphical user interface that is used to edit input parameters that describe the initial state of the RTG and the time-varying loads and environment to which it will be exposed. Performance is computed by modeling the flows of heat from the radioactive source and through the thermocouples, also allowing for losses, to determine the temperature drop across the thermocouples. This temperature drop is used to determine the open-circuit voltage, electrical resistance, and thermal conductance of the thermocouples. Output power can then be computed by relating the open-circuit voltage and the electrical resistance of the thermocouples to a specified time-varying load voltage. Degra accounts for the gradual deterioration of performance attributable primarily to decay of the radioactive source and secondarily to gradual deterioration of the thermoelectric material. To provide guidance to an RTG designer, given a minimum of input, Degra computes the dimensions, masses, and thermal conductances of important internal structures as well as the overall external dimensions and total mass.
    Keywords: Energy Production and Conversion
    Type: NPO-45252 , NASA Tech Briefs, September 2008; 51-52
    Format: application/pdf
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