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Integrated Rate Isolation Sensor

Sensor allows for fault detection and isolation using only two IMUs. Lyndon B. Johnson Space Center, Houston, Texas Some vehicles use an internal measurement unit (IMU) system to determine the speed, acceleration, orientation, position, and/or direction of movement of the vehicle. Vehicles used for high-availability or life-critical systems may employ a fault-tolerant IMU design. Typically, such vehicles use three or more IMUs to detect the failure of an IMU and isolate the failing IMU from the other functional IMUs. A fault-tolerant system having multiple IMUs pays an associated mass, power, and volume penalty for each additional IMU. The mass/power/volume (M/P/V) of a fault-tolerant IMU system is the M/P/V of an individual IMU multiplied by the number of IMUs employed to do fault tolerance. Furthermore, each additional IMU adds to the cost of a fault-tolerant system.

Posted in: Physical Sciences, Briefs

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Mercury-Cadmium-Telluride Focal Plane Array for Warm Alignment of Imaging Spectroscopy Systems

This array minimizes the need to cold-cycle instrumentation, reducing cost and time for integration and testing. NASA’s Jet Propulsion Laboratory, Pasadena, California A new technique allows a mercury-cadmium-telluride (MCT) focal plane array (FPA) to operate at room temperature. These results were obtained through experimentation by varying the integration time, frame rate, and bias levels to optimize the output when warm.

Posted in: Physical Sciences, Briefs

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Enhanced Auditory Alert Systems

Spatial modulation is used to improve the detectability of an alert signal. Ames Research Center, Moffett Field, California Auditory warning systems for human interfaces are often designed around criteria that depend primarily upon signal loudness. It is well understood from the auditory literature that, by making an alert signal substantially louder than the measured background noise level, one can insure that an alert signal will be detectable. Such auditory alert systems have been used in the aviation industry for a number of years in order to raise the awareness of the crew for terrain proximity, for example. However, if an alert signal amplitude is too loud, the alert signal may produce a “startle effect” that hinders performance in some high-stress situations.

Posted in: Physical Sciences, Briefs, TSP

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Carbon Monoxide Silicate Reduction System

This system generates high oxygen yields from lunar soil and can be used for the production of ferrosilicon and high-grade silicon metal. Lyndon B. Johnson Space Center, Houston, Texas Oxygen produced from lunar resources is a very desirable product to greatly reduce the mass lifted from the Earth’s surface in support of exploration activities. The ability to obtain high yields of oxygen from undifferentiated lunar soils enables planning for near-term piloted missions to the Moon. One technology tested for the production of lunar oxygen has been hydrogen reduction of lunar soils. Oxygen yields from hydrogen reduction are generally between one and four percent of un-beneficiated lunar soil.

Posted in: Physical Sciences, Briefs, TSP

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Modeling Lunar Surface Systems Concepts of Operations

The plans that are generated can be optimized for a specific set of goals, such as maximizing science data or minimizing power consumption. NASA’s Jet Propulsion Laboratory, Pasadena, California The goal of this work was to model lunar surface systems using a declarative planning system (ASPEN — Activity Scheduling/Planning Environment), provide a parameterizable Excel document to aid in the model generation, and deliver both Mac and PC versions. An adaptation of Microsoft Excel and ASPEN for Lunar Surface System concepts of operations was used. The goal of the system is to enable searching through several concepts of operations. A concept of operations consists of a proposed schedule of high-level activities and parameterization of resources (e.g., power, communications, oxygen, water, etc.) where three distinct phases of development occurred: (1) initial system development for Lunar, (2) planning system development for Lunar, and (3) planning system development for NASA’s 13th Desert Research and Technology Studies (Desert RATS) live trial.

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

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Portable Distributed Scripts (PoDS)

A Python application enables a user to execute a series of independent tasks on multicore clusters. Goddard Space Flight Center, Greenbelt, Maryland “Portable Distributed Scripts” (PoDS) is a Python application that allows users to execute serial independent tasks concurrently across nodes on multicore clusters. The package consists of a set of scripts working together through a simple text-based interface. A user only needs to provide minimal information to perform the desired tasks.

Posted in: Information Sciences, Briefs

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Portable Distributed Scripts (PoDS)

A Python application enables a user to execute a series of independent tasks on multicore clusters. Goddard Space Flight Center, Greenbelt, Maryland “Portable Distributed Scripts” (PoDS) is a Python application that allows users to execute serial independent tasks concurrently across nodes on multicore clusters. The package consists of a set of scripts working together through a simple text-based interface. A user only needs to provide minimal information to perform the desired tasks.

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

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