Graphical Input-Output Visualization Tool for DAVE-ML Models

Langley Research Center, Hampton, Virginia

Adopters of the AIAA/ANSI Standard S119, “Flight Dynamics Model Exchange Standard,” are required to deal with models encoded using DAVE-ML, an XML grammar. While examining the model via a text editor, the ability to visualize nonlinear mappings between input and output signals is not easy. This innovation provides a simple, easy-to-use, standalone Java application that provides the capability to examine the response of the model to combinations of input values. The models are encoded in XML, which is text-based.

Posted in: Briefs, Electronics & Computers, Software, Simulation and modeling, Communication protocols, Flight management systems
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Synchronization and Visualization of Arbitrary Streams (SAVORS)

Ames Research Center, Moffett Field, California

The purpose of SAVORS is to supercharge the command-line tools already used by administrators with powerful visualizations that help them understand the output much more rapidly and with far greater scalability across systems. SAVORS not only supports the output of existing commands, but does so in a manner consistent with those commands by combining the line-editing capabilities of vi, the rapid window manipulation of GNU screen, the power and compactness of Perl expressions, and the elegance of UNIX pipelines.

Posted in: Briefs, Electronics & Computers, Software, Computer software and hardware, Data management
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Using a Moderate Ionospheric Storm Detector to Improve WAAS Availability

The Wide Area Augmentation System (WAAS) broadcasts information that allows users to bound the positioning error that arises from ionospheric delay of signals emitted by Global Positioning System satellites. A critical objective of WAAS is to make ionospheric grid delays (IGDs) and grid ionospheric vertical errors (GIVEs) available to users as often as possible.

Posted in: Briefs, Electronics & Computers, Information Sciences, Software, Global positioning systems, Global positioning systems (GPS), Satellite communications, Weather and climate
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JLAB Tracking Tool (JTRAK)

Goddard Space Flight Center, Greenbelt, Maryland

The JLAB Tracking Tool (JTRAK) is a Web-enabled database tool designed to automate the tracking of James Webb Space Telescope (JWST) Integrated Ground Support System (IGSS) and Integrated Test Support System (ITSS) configured items. These configured items consist of IGSS and ITSS equipment and materials; hardware and software revisions including patch releases of the Science Instrument Development Units (SIDUs) and the Science Instrument Test Sets (SITS); ground lab COTS software license versions and maintenance schedules; and other miscellaneous documents.

Posted in: Briefs, TSP, Electronics & Computers, Information Sciences, Software, Computer software and hardware, Satellite communications, Data management
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Orbital Mechanics Simulation Program for Educational Outreach

Langley Research Center, Hampton, Virginia

AJava software program was developed that provides a solar system simulation, demonstrating the application of calculus to understanding and modeling how the real universe operates. The program can be modified by the user to study various changes in physical properties, and software implementations on behavior.

Posted in: Briefs, Electronics & Computers, Software, Computer simulation, Computer software and hardware, Education, Education and training
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Educational Software for OctaSat Nanosatellite Training Kit

Langley Research Center, Hampton, Virginia

Nanosatellites are very small satellites that can conduct various space missions using microelectronics, primarily in near-Earth orbits. Aerospace engineering students need to learn about the working principles and control of nanosatellites. However, the cost of an actual nanosatellite system is very expensive and is not suitable for an engineering college-level education. Therefore, this simplified classroom-based simulation kit for nanosatellite was developed, named OctaSat.

Posted in: Briefs, Electronics & Computers, Software, Simulation and modeling, Computer software and hardware, Education, Education and training, Satellites
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Discovery Through Eigenbasis Modeling of Uninteresting Data

The system learns only what to ignore, reducing the possibility of missing the items of interest.

NASA’s Jet Propulsion Laboratory, Pasadena, California

When presented with a new data set, a common initial goal is to explore its contents in a discovery mode to find items of interest. However, each user who views the data set may have a different scientific goal in mind, and therefore a different desired prioritization of the items for examination. Further, as the users explore more of the data set, they accumulate concrete examples of what is or is not of interest. The goal of this work was to formalize this iterative approach to understanding large data sets, and instantiate it with methods capable of the necessary adaptation as the system iteratively acquires user feedback.

Posted in: Briefs, TSP, Electronics & Computers, Information Sciences, Software, Statistical analysis, Data management
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Obstacle Avoidance Methods

NASA’s Jet Propulsion Laboratory, Pasadena, California

Obstacle avoidance is a difficult problem due to the non-convex state constraints. Therefore, the feasible state space needs to be convexified, or split, into convex regions at which point the search for an optimal solution among those convex regions is done. Methods for obstacle avoidance include two mixed integer linear programming (MILP) methods (obstacle related method and path-related method) and a state-constraint convexification method.

Posted in: Briefs, TSP, Electronics & Computers, Information Sciences, Software, Computer software and hardware, Collision avoidance systems
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Control Software for Integrated CW Radar Module

This software controls the behavior of a miniaturized microwave radar module. It controls the hardware, digitizes raw samples from the analog output of the module, and applies DSP (digital signal processing) algorithms to the data stream to reduce the bandwidth and data rate. It also implements an automatic calibration algorithm to adjust the I/Q (in-phase and quadrature) values in the cancellation path to remove a large unchanging signal. The software implements a variety of commands to control the behavior of the system, and provides for synchronization of multiple modules. It encodes the digital data in a format suitable for serial ports.

Posted in: Briefs, TSP, Electronics & Computers, Information Sciences, Software, Computer software and hardware, Radar
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An Empirical Metric of Individual Datapoint Utility Given Ample Metadata as Applied to the OCO-2 Flight System

This method constructs new warn levels for metadata-rich data sources.

NASA’s Jet Propulsion Laboratory, Pasadena, California

Traditionally, quality flags provided a binary yes/no estimation of a datapoint’s utility. However, in modern instrumentation, significant auxiliary information for each datapoint can be obtained. This permits prediction of more than a binary estimate of good or bad data. Further, the physical confounding forces that obscure an observation’s utility are themselves rarely binary, such as the example of clouds with varying thickness from insignificant to entirely opaque. In this method, many different increasingly stringent filters are created allowing less and less data through, while attempting to minimize an error metric. This metric can be compared with select “truth” systems such as ground observations or regions of the Earth where the truth is believed to be predictable and known. For each sounding, the number of these filters that reject the observation in question becomes an estimate of its data quality: larger values mean most filters reject the sounding, while smaller values mean most filters accept the sounding. This integer, ranging from 0 to 19, is called the Warn Level. Instead of a binary yes/no data quality flag, this instead provides a data ordering paradigm with “better” and “worse” data. Warn Levels can be developed for any metadata-rich datasource with a functional error metric to help guide researchers to superior, tunable data filtration.

Posted in: Briefs, TSP, Electronics & Computers, Information Sciences, Software, Computer software and hardware, Data management
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