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Briefs: Information Technology
Atmospheric Turbulence Modeling for Aero Vehicles
Atmospheric turbulences are fractional order, and because of that, it is difficult to simulate these disturbances. Past models fall short in providing sufficiently accurate simulation of atmospheric turbulence, especially at high altitudes, for control designs of high-speed atmospheric vehicles. In...
Briefs: Information Technology
Autonomic Quiescence
Biologically inspired autonomous and autonomic systems (AAS) are essentially about creating self-directed and self-managing systems based on metaphors such as that of the autonomic nervous system. Agent technologies have been identified as a key enabler for engineering autonomy and autonomicity in systems, both in terms of...
Briefs: Information Technology
Optimization of OT-MACH Filter Generation for Target Recognition
An automatic Optimum Trade-Off Maximum Average Correlation Height (OT-MACH) filter generator for use in a gray-scale optical correlator (GOC) has been developed for improved target detection. While the OT-MACH filter has been shown to be an optimal filter for target detection,...
Briefs: Information Technology
A Decision Support Tool to Assess Upper-Level Winds for Space Launch
An Excel-based graphical user interface (GUI) was developed for the 45th Weather Squadron (45 WS) Launch Weather Officers (LWOs), allowing them to assess numerical weather prediction model forecasts of upper-level winds and compare the forecasts to observations from Cape Canaveral...
Briefs: Information Technology
Change Detection in Orbital Images Using Relative Landmark Graphs
Traditional methods for change detection involve the pixel-wise registration of two images and a subsequent differencing operation that highlights any changes at the individual pixel level. These methods have two limitations: (1) they are computationally expensive, and (2) they are...
Briefs: Information Technology
Heavy-Alkane Oxidation Kinetic-Mechanism Reduction
Oxidation chemical reactions of many practical fuels encompass thousands of species. When simulating complex turbulent reactive flows, it is impossible to account for the time and spatial evolution of all these species given current and foreseeable-future computer memory and time. This innovation...
Briefs: Physical Sciences
Covariance Analysis of Astrometric Alignment Estimation Architectures for Precision Dual-Spacecraft Formation Flying
A paper highlights analysis of proposed navigation systems and architectures for achieving precise dual-spacecraft astrometric alignment. The dynamics of dual-spacecraft relative motion, within a restricted n-body problem framework,...
Briefs: Mechanical & Fluid Systems
Porous Media Jacket for Use in Regeneratively Cooled Rocket Engines
A paper describes a method for regeneratively cooling worst-case gas-phase thrusters using porous media integrated into a regenerative cooling jacket. The enhanced surface area in the jacket compensates for the much lower effective heat transfer coefficients of gases as compared to...
Briefs: Physical Sciences
Automated Purgatoid Identification
An algorithm was developed that automatically processes images captured by the HiRISE camera on the Mars Reconnaissance Orbiter to identify and locate the presence of purgatoids in monochrome images.
Briefs: Physical Sciences
Interplanetary CubeSats
A report describes upgraded CubeSat satellite elements for the interplanetary environment, with solar sail propulsion and the interplanetary superhighway for navigation and maneuvering. They can host small, capable instruments and optical telecommunications on a mission to map the composition of a sequence of near-Earth...
Briefs: Manufacturing & Prototyping
Metal-Assisted Fabrication of Biodegradable Porous Silicon Nanostructures
Porous silicon nanowires are fabricated by two-step, metal-assisted electroless chemical etching of p-type or n-type silicon wafers. This method, in combination with nanolithography or nanopatterning, can be applied to fabricate porous silicon nanostructures of different...
Briefs: Manufacturing & Prototyping
Post-Growth, In Situ Adhesion of Carbon Nanotubes to a Substrate for Robust CNT Cathodes
The field emission electron sources using carbon nanotubes (CNTs) are being targeted for low-power vacuum microelectronic applications for harshenvironment operation (high temperature, pressure, and corrosive atmosphere). While CNTs have demonstrated excellent...
Briefs: Manufacturing & Prototyping
Thermal Mechanical Preparation of Glass Spheres
Samples of lunar regolith have included small glass spheres. Most literature has suggested the small spheres were formed by meteorite impacts. The resulting transformation of kinetic energy to thermal energy caused the lunar surface to melt. The process yielded glass spheres. Recreating a meteorite...
Briefs: Materials
The automotive industry faces growing pressure for more efficient vehicles. This pressure comes from many sources including government regulations, decreasing...
Briefs: Materials
Mechanistic-Based Multiaxial- Stochastic-Strength Model for Transversely- Isotropic Brittle Materials
A methodology has been developed and the software written to predict the probability of failure of transversely isotropic (a type of anisotropy) materials under generalized thermomechanical loading. This methodology is mechanistic in that it is...
Briefs: Imaging
Reducing Drift in Stereo Visual Odometry
Visual odometry (VO) refers to the estimation of vehicle motion using onboard cameras. A common mode of operation utilizes stereovision to tri angulate a set of image features, track these over time, and infer vehicle motion by computing the apparent point cloud motion with respect to the cameras. It has...
Briefs: Physical Sciences
Technique for Finding Retro-Reflectors in Flash LIDAR Imagery
Orbital rendezvous and docking of two spacecraft is a topic of continued interest to NASA. For crewed missions, it is frequently the case that the target is cooperative (i.e., is equipped with some sort of navigation aid). If one of the relative navigation instruments is a Flash LIDAR,...
Briefs: Imaging
Novel Hemispherical Dynamic Camera for EVAs
A novel optical design for imaging systems is able to achieve an ultra-wide field of view (UW-FOV) of up to 208°. The design uses an integrated optical design (IOD). The UW-FOV optics design reduces the wasted pixels by 49% when compared against the baseline fisheye lens. The IOD approach results in a...
Briefs: Electronics & Computers
Dual-Leadframe Transient Liquid Phase Bonded Power Semiconductor Module Assembly and Bonding Process
A high-temperature-capable widebandgap semiconductor power module package, coupled with a new high-temperature- capable bonding process (with...
Briefs: Electronics & Computers
Methods for Mitigating Space Radiation Effects, Fault Detection and Correction, and Processing Sensor Data
The Integrated Modular Avionics (IMA) architecture being developed for space applications requires that sensor data be autonomously sampled and transmitted to the system network. This transmission needs to occur on a predetermined, fixed...
Briefs: Electronics & Computers
Quad First Stage Processor: A Four-Channel Digitizer and Digital Beam-Forming Processor
A 4-channel digitizer was designed, built, and tested. The very large, complex board enables SweepSAR. The proposed Deformation, Eco-Systems, and Dynamics of Ice Radar (DESDynl-R) Lband SAR instrument employs multiple digital channels to optimize resolution...
Briefs: Electronics & Computers
Compact Ka-Band Antenna Feed with Double Circularly Polarized Capability
NASA has an interest in utilizing the Ka-band frequency allocation. One of the main reasons for migrating to Kaband is the need for higher frequency bandwidth to enable higher data rates. A dual circular polarized wideband antenna for Ka-band communications applications was...
Briefs: Mechanical & Fluid Systems
The antenna is composed of two main deployable structural components that help it achieve the large packing factor necessary to fit within the small volume of the CubeSat. The primary component of...
Briefs: Mechanical & Fluid Systems
A metallic sleeve provides protection and guidance for the actuating lanyard pull of a parachute system reefing line cutter. This device ensures that the reefing line cutter is not damaged during...
Briefs: Mechanical & Fluid Systems
Metabolic Heat Regenerated Temperature Swing Adsorption
Two fundamental problems facing the development of a portable system to sustain life on extraterrestrial surfaces are (1) heat rejection and (2) rejection of metabolically produced CO2 to an environment with a ppCO2 of 0.4 to 0.9 kPa as is present on Mars. Portable life support systems...
Briefs: Physical Sciences
Variable Camber Aerodynamic Control Surfaces and Active Wing Shaping Control
A new concept of aircraft aerodynamic control surfaces has been developed in connection with another new concept of active wing shaping control for reducing aircraft drag that will result in less fuel burn. The first concept is referred to as a variable camber continuous...
Briefs: Physical Sciences
In order to study atmospheric or evolved gases, it is highly advantageous for an instrument (e.g. mass spectrometer (MS), thermal conductivity detector (TCD)) to simplify the gas stream with a...
Briefs: Software
360° Visual Detection and Object Tracking on an Autonomous Surface Vehicle
This software addresses the problem of an autonomous vehicle patrolling a region for objects of interest using multiple cameras. The system must identify and track the objects over time and localize their positions in the world. It implements an autonomous perception and...
Briefs: Software
Simulation of Charge Carrier Mobility in Conducting Polymers
Electric conduction in polymers is one of the key elements in avoiding catastrophic internal electrostatic discharge in dielectrics during space missions. This software package enables the simulation of carrier mobility for any given site concentration, which is a material design...
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