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NASA Tech Briefs’ Information Sciences Web page spotlights new computer software architectures, algorithms, mathematical models, and simulation and analysis tools, as published in NASA Tech Briefs magazine. Many of the Tech Briefs below are correlated to a Technical Support Package (TSP) or White Paper that can be downloaded free of charge.
May 2013
Video Altimeter and Obstruction Detector for an Aircraft

Video-based altimetric and obstructiondetection systems for aircraft have been partially developed. The hardware of a system of this type includes a downward-looking video camera, a video digitizer, a Global Positioning System receiver or other means of measuring the aircraft velocity relative to the ground, a gyroscopebased or other attitude-determination subsystem, ...
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Mixed Integer Programming and Heuristic Scheduling for Space Communication

Optimal planning and scheduling for a communication network was created where the nodes within the network are communicating at the highest possible rates while meeting the mission requirements and operational constraints. The planning and scheduling problem was formulated in the framework of Mixed Integer Programming (MIP) to introduce a special ...
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Optimization of Turbine Blade Dovetail Geometry

Two-level optimization predicts designs with the least contact pressure and stress.

The reliability of a gas or steam turbine is strongly dependent on the structural design of its blades. In land-based power generation units, turbine blades are connected to the turbine disk by a dovetail joint or fastener. ...
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Control Software for Piezo Stepping Actuators

A control system has been developed for the Space Interferometer Mission (SIM) piezo stepping actuator. Piezo stepping actuators are novel because they offer extreme dynamic range (centimeter stroke with nanometer resolution) with power, thermal, mass, and volume advantages over existing motorized actuation technology. These advantages come with the added benefit ...
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Sequential Probability Ratio Test for Spacecraft Collision Avoidance Maneuver Decisions

A document discusses sequential probability ratio tests that explicitly allow decision-makers to incorporate false alarm and missed detection risks, and are potentially less sensitive to modeling errors than a procedure that relies solely on a probability of collision threshold. Recent work on constrained Kalman filtering has suggested an approach to ...
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Cursor Control Device Test Battery

A suite of software-based tasks can be used for the study of cursor control devices, gloved operations, and fine motor control.

The test battery was developed to provide a standard procedure for cursor control device evaluation. The software was built in Visual Basic and consists of nine tasks ...
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Apr 2013
Advanced Dispersed Fringe Sensing Algorithm for Coarse Phasing Segmented Mirror Telescopes
Neural Network Back-Propagation Algorithm for Sensing Hypergols
Certification-Based Process Analysis
Surface Navigation Using Optimized Waypoints and Particle Swarm Optimization
Smart-Divert Powered Descent Guidance to Avoid the Backshell Landing Dispersion Ellipse
Adaptive Sampling of Spatiotemporal Phenomena With Optimization Criteria
Estimating Foreign-Object- Debris Density From Photogrammetry Data
Building a 2.5D Digital Elevation Model From 2D Imagery
On a Formal Tool for Reasoning About Flight Software Cost Analysis
Mar 2013
Display Provides Pilots with Real-Time Sonic-Boom Information
Vectorized Rebinning Algorithm for Fast Data Down-Sampling
Onboard Algorithms for Data Prioritization and Summarization of Aerial Imagery
Remote Data Exploration with the Interactive Data Language (IDL)
Mixture-Tuned, Clutter Matched Filter for Remote Detection of Subpixel Spectral Signals
SequenceL: Automated Parallel Algorithms Derived from CSP-NT Computational Laws
Determining Temperature Differential to Prevent Hardware Cross- Contamination in a Vacuum Chamber
Feb 2013
Measurements of Ultra-Stable Oscillator (USO) Allan Deviations in Space
Validation of Proposed Metrics for Two-Body Abrasion Scratch Test Analysis Standards
Measuring and Estimating Normalized Contrast in Infrared Flash Thermography
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