SEARCH · Search NASA
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.
Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.
A systematic approach is presented to constructing a radiation assurance case using Goal Structured Notation (GSN) for spacecraft containing COTS parts. The GSN paradigm is applied to an SRAM single-event upset experiment board designed to fly on a CubeSat November 2016. Construction of a radiation assurance case without use of hardened parts or extensive radiation testing is discussed.
This presentation provides an overview of the SpaceCube data processing technology and successful use of Commercial Off-the-Shelf (COTS) parts on 11 space missions/payloads.
This discussion takes the viewpoint of how the customer can ensure the quality of COTS components.
This paper reviews the current status of MEMS packaging technology from COTS to specific application provides lessons learned, and finally, identifies a need for systematic approach for this purpose.
In this paper, we report our experiences and findings on the design of fault-tolerant bus architecture comprised of two COT buses, the IEEE 1394 and the I***Sup 2***C.
Burn-in (BI) and life testing (LT) are the most important reliability related elements of quality assurance for components used in space systems. This presentation discusses the need of transition from the existing approach to BI, LT, and destructive physical analysis (DPA) of COTS capacitors that is based on military specifications to an alternative approach that is based on Physics of Failure and HALT.
This presentation provides a history on the reliability of MIL-SPEC and COTS EEE parts along with a collection of major parts problems experienced under the traditional approach for parts assurance that set a baseline level of risk.
The integrated monitoring, analysis and control commercial off-the-shelf system (IMACCS) for the provision of real-time satellite command and telemetry support, orbit and attitude determination, events prediction and data trend analysis, is considered. The upgrades made to the original commercial, off-the-shelf (COTS) prototype are described. These upgrades include automation capability, and spacecraft integration and testing capability. A further extension to the prototype is the establishment of a direct radio frequency interface to a spacecraft. The systems development approach employed is described.
Radiation effects and testing programs on commercial off-the-shelf (COTS) devices and circuits, which are important for NASA programs, are discussed. Demands for increased performance levels in spacecraft systems is stimulating the use of electronic and photonic devices. Some advances in electronics to reach high performance will result in the miniaturization of devices, which will lead to increased radiation vulnerability.
Seven commercial off the shelf (COTS) boards containing electronic devices (all in plastic packages, PEMS), under consideration for use in a spacecraft subsystem, were exposed to beams of very high energy ions at the National Superconducting Cyclotron Laboratory (MSU). The ion energies were high enough that an entire board could be exposed in air, and it could still penetrate through the plastic and reach the silicon die. A total of about 300 runs were made, and for each, the LET of the ion entering the silicon die had to be determined, based on the thickness of the plastic lid and the thickness of overlaying materials (e.g., aluminum degraders). Single event latchup (SEL) and functional interrupt (SEFI) were determined during each run, the SEFI by means of simple programs being continuously written to and read from the boards to monitor functionality, while each part was being exposed to the heavy ions.
This viewgraph presentation profiles an experiment to evaluate the suitability of commercial off-the-shelf (COTS) ceramic chip capacitors for NASA spaceflight applications. The experiment included: 1) Voltage Conditioning ('Burn-In'); 2) Highly Accelerated Life Test (HALT); 3) Destructive Physical Analysis (DPA); 4) Ultimate Voltage Breakdown Strength. The presentation includes results for each of the capacitors used in the experiment.
During the summer of 2004 NASA Langley Research Center flight tested a Synthetic Vision System (SVS) at the Reno/Tahoe International Airport (RNO) and the Wallops Flight Facility (WAL). The SVS included a Runway Incursion Prevention System (RIPS) to improve pilot situational awareness while operating near and on the airport surface. The flight tests consisted of air and ground operations to evaluate and validate the performance of the system. This paper describes the flight test and emphasizes how positioning data was collected, post processed and analyzed through the use of a COTS-derived software system. The system that was developed to analyze the data was constructed within the MATLAB(TM) environment. The software was modified to read the data, perform several if-then scenarios and produce the relevant graphs, figures and tables.
The use of COTS-based systems in space missions for scientific data processing is very attractive, as their ratio of performance to power consumption of commercial components can be an order of magnitude greater than that of radiation hardened components, and the price differential is even higher.
This paper describes a COTS bus network architecture consisting of the IEEE 1394 and SpaceWire buses.
The purpose of this research and study paper is to provide a summary description and results of rapid development accomplishments at NASA/JPL in the area of advanced distributed computing technology using a Commercial-Off--The-Shelf (COTS)-based object oriented component approach to open inter-operable software development and software reuse.
Information and discussion of the development of an Avionics Architecture Tool that is model-based using commercial off the shelf (COTS) products will be provided.
Among other challenges from NASA's X2000 Technology Development Program, affordability and miniaturizaton are prominent criteria, which 1) preclude the traditional solutions for mission reliability that rely on customer-built hardware and extensive component/subsystem replication, and 2) call for commercial-of-the-shelf (COTS) based approaches incorporating novel, practical fault tolerance techniques.
A new method using an array of MOS transistors formeasuring dose absorbed from ionizing radiation is compared to previous dosimetric methods., The accuracy and precision of dosimetry based on COTS SRAMs, DRAMs, and WPROMs are compared and contrasted. Applications of these devices in various space missions will be discussed. TID results are presented for this summary and microdosimetricresults will be added to the full paper. Finally, an analysis of the optimal condition for a digital dosimeter will be presented.