Building Blocks for Large-scale Integration of Logic Circuits
Large scale integration of logic circuits
LOGIC CIRCUIT↗
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Results for “logic”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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The realization of transfer functions with logical networks
Techniques for logical network synthesis with given transfer function based on approximation methods using sampled inputs
TRANSFER FUNCTION↗
Improved micropower logic circuits
Micropower transistor logic circuits designed to operate from power supply voltages which vary with temperature
TEMPERATURE EFFECT↗
Pneumatic logic rocket engine sequence control.
Fluidic breadboard version of rocket engine sequence control, describing pneumatic logic package and general limitations
FLUIDICS↗
A design procedure for radiation hardening certain NOR gate logic circuits.
Design procedure for production of radiation resistant NOR gate logic circuit
RADIATION RESISTANCE↗
Autonomous Navigation of Planetary Rovers: A Fuzzy Logic Approach
This paper presents an new strategy for autonomous navigation of planetary rovers using the fuzzy logic framework and novel on-board measure of terrain traversability.
autonomous navigation planetary rovers fuzzy logic↗
Structural Vibration Suppression Using Fuzzy Logic Control
This paper designs a fuzzy logic controller to suppress the vibrations of a large space antenna-like ground experimental structure located at the JPL/AFPL Large Spacecraft Control Laboratory.
fuzzy logic controller linear robust control fuzzy↗
Identification of Abnormal System Noise Temperature Patterns in Deep Space Network Antennas Using Neural Network Trained Fuzzy Logic
This paper presents the development of a fuzzy logic function trained by an artificial neural network to classify the system noise temperature (SNT) of antennas in the NASA Deep Space Network (DSN). The SNT data were classified into normal, marginal, and abnormal classes. The irregular SNT pattern was further correlated with link margin and weather data. A reasonably good correlation is detected among high SNT, low link margin and the effect of bad weather; however we also saw some unexpected non-correlations which merit further study in the future.
pattern identification↗
Microhard MHX 2420 Orbital Performance Evaluation Using RT Logic T400CS
A major upfront cost of building low cost Nanosatellites is the communications sub-system. Most radios built for space missions cost over $4,000 per unit. This exceeds many budgets. One possible cost effective solution is the Microhard MHX2420, a commercial off-the-shelf transceiver with a unit cost under $1000. This paper aims to support the Nanosatellite community seeking an inexpensive radio by characterizing Microhard's performance envelope. Though not intended for space operations, the ability to test edge cases and increase average data transfer speeds through optimization positions this radio as a solution for Nanosatellite communications by expanding usage to include more missions. The second objective of this paper is to test and verify the optimal radio settings for the most common cases to improve downlinking. All tests were conducted with the aid of the RT Logic T400CS, a hardware-in-the-loop channel simulator designed to emulate real-world radio frequency (RF) link effects. This study provides recommended settings to optimize the downlink speed as well as the environmental parameters that cause the link to fail.
Microhard MHX 2420↗
Multi-Source Sensor Fusion for Small Unmanned Aircraft Systems Using Fuzzy Logic
As the applications for using small Unmanned Aircraft Systems (sUAS) beyond visual line of sight (BVLOS) continue to grow in the coming years, it is imperative that intelligent sensor fusion techniques be explored. In BVLOS scenarios the vehicle position must accurately be tracked over time to ensure no two vehicles collide with one another, no vehicle crashes into surrounding structures, and to identify off-nominal scenarios. Therefore, in this study an intelligent systems approach is used to estimate the position of sUAS given a variety of sensor platforms, including, GPS, radar, and on-board detection hardware. Common research challenges include, asynchronous sensor rates and sensor reliability. In an effort to realize these challenges, techniques such as a Maximum a Posteriori estimation and a Fuzzy Logic based sensor confidence determination are used.
fuzzy logic↗
Multi-Source Sensor Fusion for Small Unmanned Aircraft Systems Using Fuzzy Logic
As the applications for using small Unmanned Aircraft Systems (sUAS) beyond visual line of sight (BVLOS) continue to grow in the coming years, it is imperative that intelligent sensor fusion techniques be explored. In BVLOS scenarios the vehicle position must accurately be tracked over time to ensure no two vehicles collide with one another, no vehicle crashes into surrounding structures, and to identify off-nominal scenarios. Therefore, in this study an intelligent systems approach is used to estimate the position of sUAS given a variety of sensor platforms, including, GPS, radar, and on-board detection hardware. Common research challenges include, asynchronous sensor rates and sensor reliability. In an effort to realize these challenges, techniques such as a Maximum a Posteriori estimation and a Fuzzy Logic based sensor confidence determination are used.
UAS↗
Binary counter uses fluid logic elements
Binary counter with two fluid flip-flops in each stage has an output taken from the output of the second flip-flop. The flip-flops each contain three fluid logic elements.
Source record↗
Research on reliable and radiation insensitive pulse-drive sources for all-magnetic logic systems final report
Pulsed generator electron tube and semiconductor device minimization and elimination - spacecraft application for all-magnetic logic system
SEMICONDUCTOR DEVICE↗
Queuing register uses fluid logic elements
Queuing register /a multistage bit-shifting device/ uses a series of pure fluid elements to perform the required logic operations. The register has several stages of three-state pure fluid elements combined with two-input NOR gates.
Source record↗
Nixie tube display unit employs time-shared logic
Cathodes of display tubes wired in parallel achieve input switching simplification of a Nixie tube display system. Use of time- shared logic energizes the appropriate anode and inhibits all unnecessary cathodes.
Gray, J.↗
Logic circuitry used to automatically test shielded cables
Automatic cable tester checks multiple shielded conductors assembly cable connections. The tester uses logic circuitry to sequentially test all conductors and their shields to reveal any connection error in a GO-NO GO test.
Dibb, G.↗
Review of research and development in fluid logic elements
Research and development in multistate fluid logic elements is reviewed in a historical and critical report. The report concludes that in the development of fluid amplifiers, there are elements with very high gain and poor switching speed, and other elements with very high switching speed and poor gain.
Reader, T.↗
Mission logic development and trajectory prediction, determination and optimization Final report
Midcourse guidance analysis and optimization with discrete measurements for mission logic development
MISSION PLANNING↗