Home

Automated Scheduling of Personnel to Staff Operations for the Mars Science Laboratory

NASA’s Jet Propulsion Laboratory, Pasadena, California The task of producing Mars Science Laboratory (MSL) personnel schedules is daunting. Through automation, the labor and number of mistakes made are reduced when compared to the manual process. This software not only allows for common constraints to be expressed, but also for these to be gracefully descoped in case a solution cannot be found, thus making this unique in the personnel scheduling arena.

Posted in: Briefs, TSP, Electronics & Computers, Information Sciences, Software

Read More >>

Area Coverage Path Planning Using Divided Grid-Graphs

NASA’s Jet Propulsion Laboratory, Pasadena, California Planning area coverage observations is a challenge in an architecture with a framing imager affixed to a bus that can be moved, and a mirror or other device that allows for small, but fast, observation of adjacent areas along the boresight of a telescope. The telescope boresight can slew slowly while the mirror system maintains pointing on a specific field of view. This allows the continuous gathering of data (much like push - broom instruments) without the need to slew or settle. Since the telescope field of view is much larger than the imager field of view, the areas to be imaged can be divided into quarters.

Posted in: Briefs, TSP, Electronics & Computers, Information Sciences, Software

Read More >>

Shape Sensing Using Multicore Fiber Optic Cable and Parametric Curve Solutions

Langley Research Center, Hampton, Virginia Apaper reports a method of converting distributed curvature measurements into a three-dimensional shape by combining elastic rod theory and differential geometry to arrive at a three-dimensional solution of the Frenet-Serret formulas. A new method of calculating the shape of a multicore fiber optic cable is presented. The method utilizes discrete strain measurements obtained in each core to create a continuous representation of fiber curvature and torsion. The Frenet-Serret equations are then solved using these representations to obtain fiber shape. Shape measurements were found to have, at most, 7.2% error. The primary source of error is most likely externally induced twisting in the fiber.

Posted in: Briefs, Electronics & Computers, Software

Read More >>

Encoders and Decoders for the AR4JA LDPC Codes

NASA’s Jet Propulsion Laboratory, Pasadena, California Low-Density Parity-Check (LDPC) codes are the best error-correcting codes known for a wide variety of communications applications. The AR4JA code family encompasses encoders and decoders for nine error-correcting codes. These include Accumulate, Repeat-by-4, and Jagged Accumulate (AR4JA) codes developed at JPL.

Posted in: Briefs, Electronics & Computers, Software

Read More >>

Explicitly Filtered Large Eddy Simulation for Prediction of a Conserved Scalar

NASA’s Jet Propulsion Laboratory, Pasadena, California The prediction of a conserved scalar is important in many fields of study. For example, in modeling of combustion processes, if a conserved scalar exists, the mathematical problem can be greatly simplified. Inert gases transported in mixtures of other gases are also simulated by a conserved scalar. This concept is also applicable to atmospheric sciences where pollutant dispersion can be studied by using a passive scalar approach.

Posted in: Briefs, Electronics & Computers, Software

Read More >>

Dictionary Management System

NASA’s Jet Propulsion Laboratory, Pasadena, California The Dictionary Management System (DMS) is a Web-based tool to develop and store a project command and telemetry dictionary. The dictionary defines a project’s flight/ground interface. In recent years, dictionaries have become very large, making it hard to maintain traditional methods of flat-file storage and manual configuration management. DMS is a centralized solution to this problem that allows a multi-disciplinary team to work together to manage the development, verification, and operational use of the dictionary.

Posted in: Briefs, TSP, Electronics & Computers, Information Sciences, Software

Read More >>

National Vulnerability Database (NVD) Query Tool

NASA’s Jet Propulsion Laboratory, Pasadena, California Currently, there are no programmatic methods to query the NIST National Vulnerability Database (NVD) without downloading the entire database in XML format, parsing the content, loading the resulting data into a self-hosted database, and then developing an interface for querying the content. This tool takes advantage of the fact that NVD provides an interactive user form for query on the website, and extends it to allow for programmatic queries to generate vulnerability reports.

Posted in: Briefs, Electronics & Computers, Software

Read More >>

The U.S. Government does not endorse any commercial product, process, or activity identified on this web site.