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Dual-Polarization, Multi-Frequency Antenna Array for use with Hurricane Imaging Radiometer

New approach promises to be more cost effective and can reduce on-station aircraft time. Advancements in common aperture antenna technology were employed to utilize its proprietary genetic algorithm-based modeling tools in an effort to develop, build, and test a dual-polarization array for Hurricane Imaging Radiometer (HIRAD) applications. Final program results demonstrate the ability to achieve a lightweight, thin, higher-gain aperture that covers the desired spectral band.

Posted in: Physical Sciences, Briefs

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Conjugate Thermal Analysis of a Generic LED Light Bulb

Thermal and fluid modeling is used to understand temperature fields and airflow around the bulb. The design and application of LED (Light Emitting Diode) lighting solutions provides new opportunities for thermofluid- mechanical modeling enabled by multiphysics analysis. A coupled thermal and fluid modeling effort was used to understand the temperature fields and airflow around a generic LED light bulb.

Posted in: Physical Sciences, Software, Briefs

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Analysis of Spiral Resonator Filters

Improved performance coupled with reduced size requires the development of novel filter designs for use in advanced wireless systems. Increasing demand for more advanced wireless systems necessitates the introduction of novel designs that are capable of simultaneously fulfilling multiple operating and performance criteria. The implementation of high-datarate transmission systems has required the development of innovative designs for microwave filters that must fit within a reduced volume to allow integration of multiple filters in more compact wireless systems. Additionally, the filter’s specific passband frequencies and quality factors must be achieved within the system’s geometrical and topological constraints.

Posted in: Physical Sciences, Software, Briefs

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ISSM: Ice Sheet System Model

In order to have the capability to use satellite data from its own missions to inform future sea-level rise projections, JPL needed a full-fledged ice-sheet/iceshelf flow model, capable of modeling the mass balance of Antarctica and Greenland into the near future. ISSM was developed with such a goal in mind, as a massively parallelized, multi-purpose finite-element framework dedicated to ice-sheet modeling.

Posted in: Physical Sciences, Software, Briefs

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Planetary Protection Bioburden Analysis Program

This program is a Microsoft Access program that performed statistical analysis of the colony counts from assays performed on the Mars Science Laboratory (MSL) spacecraft to determine the bioburden density, 3-sigma biodensity, and the total bioburdens required for the MSL prelaunch reports. It also contains numerous tools that report the data in various ways to simplify the reports required. The program performs all the calculations directly in the MS Access program. Prior to this development, the data was exported to large Excel files that had to be cut and pasted to provide the desired results. The program contains a main menu and a number of submenus. Analyses can be performed by using either all the assays, or only the accountable assays that will be used in the final analysis.

Posted in: Physical Sciences, Software, Briefs

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Sally Ride EarthKAM — Automated Image Geo-Referencing Using Google Earth Web Plug-In

Sally Ride EarthKAM is an educational program funded by NASA that aims to provide the public the ability to picture Earth from the perspective of the International Space Station (ISS). A computer-controlled camera is mounted on the ISS in a nadir-pointing window; however, timing limitations in the system cause inaccurate positional metadata. Manually correcting images within an orbit allows the positional metadata to be improved using mathematical regressions. The manual correction process is time-consuming and thus, unfeasible for a large number of images.

Posted in: Physical Sciences, Software, Briefs, TSP

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Ionospheric Specifications for SAR Interferometry (ISSI)

The ISSI software package is designed to image the ionosphere from space by calibrating and processing polarimetric synthetic aperture radar (PolSAR) data collected from low Earth orbit satellites. Signals transmitted and received by a PolSAR are subject to the Faraday rotation effect as they traverse the magnetized ionosphere. The ISSI algorithms combine the horizontally and vertically polarized (with respect to the radar system) SAR signals to estimate Faraday rotation and ionospheric total electron content (TEC) with spatial resolutions of sub-kilometers to kilometers, and to derive radar system calibration parameters. The ISSI software package has been designed and developed to integrate the algorithms, process PolSAR data, and image as well as visualize the ionospheric measurements.

Posted in: Physical Sciences, Software, Briefs

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