Novel Read-Out Integrated Circuit with Individual Pixel Programmability for Astronomy Infrared Focal Plane Arrays, Phase IIdata.nasa.gov | Last Updated 2018-07-19T07:45:15.000Z
One of the key components in many NASA missions is a large-format focal plane Focal Plane Array (FPA) to capture images or two-dimensional, hyperspectral information, especially in the Infra-Red (IR) domain. Apart from the detector, the performance of these FPAs is determined by the Read-Out Integrated Circuit (ROIC) that amplifies and multiplexes photo generated charge for signal processing by peripheral circuitry. In this project, we propose to develop a new ROIC for low background applications, specifically designed to overcome present limitations of image persistence and inter-pixel capacitance (IPC). The main innovation in this project is an adaptive unit cell that can be individually and randomly programmed via on-chip logic to control bias state and reset duration of any pixel in the array while the integration of science data is on-going. In Phase I we conducted a pixel trade study and performance evaluation for a Capacitive Trans-Impedance Amplifier (CTIA) and a source follower per detector (SFD) type pixel using analog circuit simulations. Then we generated the optimum unit cell layout, defined the overall architecture and created the top-level schematic. By the end of Phase I we have completed the blue prints for the design. The completion of the top-level schematics, verified through simulation, is a critical milestone in the development. It substantially reduces the risk associated with creating new ROIC technology and will allow us to efficiently fabricate and test the device in Phase II. All results from Phase I are documented in a preliminary Interface Control Document (ICD) so that the new ROIC can be considered for future missions. In Phase II we will produce the layout of the entire chip for fabrication using stitching lithography in a state of the art CMOS foundry and demonstrate its functionality on packaged prototypes. By the end of Phase II, wafers of a known functioning ROIC design will be available for hybridization.
- API data.nasa.gov | Last Updated 2018-07-19T07:01:25.000Z
<p>The AES Water Recovery Project (WRP) is advancing environmental control and life support systems water recovery technologies to support human exploration beyond low earth orbit. For FY12-14, the AES Water Recovery Project is focused on the following: Cascade Distillation System (CDS): development of new primary processor for water recovery Brine Water Recovery: develop/test systems to recover water from urine brines GreenTreat: evaluate effectiveness of low toxicity urine pretreatments Dormancy: assess impacts of dormancy (unmanned time periods) on beyond LEO water systems Silver Biocide: investigate usage of silver biocide for potable water disinfection Water System Architecture: establish the architecture for NASA's future Water Recovery System This project merged into AES Life Support Systems Project in FY15.<p/><p>The development of reliable, energy-efficient, and low-mass spacecraft systems to provide environmental control and life support (ECLS) is critical to enable long duration human missions beyond low Earth orbit (LEO). The Human Exploration Framework Team (HEFT) identified high-reliability life support systems as a required technology for destinations beyond cis-lunar space. The AES Water Recovery Project (WRP), led by Johnson Space Center (JSC) and partnered with the Ames Research Center (ARC), Glenn Research Center (GRC), and Marshall Space Flight Center (MSFC) is advancing water recovery technologies within the framework established by HEFT and the AES program. Recycling of life support consumables is necessary to reduce resupply mass and provide for vehicle autonomy. Although an integrated life support system is made up of a variety of systems to sustain functions such as atmospheric revitalization, thermal control, and waste management, a major driver in the sizing of a life support system is the Water Recovery System (WRS). As mission durations increase, recycling of water becomes critical. Stored water is inadequate, and wastewater sources must be recycled into potable water. The state-of-the-art (SOA) WRS used on board the International Space Station (ISS) relies on a high rate of consumable use and has experienced issues with precipitation and biofouling that have required operational and design changes. Due to these issues the recovery rate of wastewater on ISS (Condensate and Urine) is currently limited to approximately 74%. The mission of the AES Water Recovery project is to develop advanced water recovery systems in order to enable NASA human exploration missions beyond LEO. The primary objective of the AES WRP is to develop water recovery technologies critical to near term missions beyond LEO. The secondary objective is to continue to advance mid-readiness level technologies to support future NASA missions. They also lead to further closure of the WRS, approaching the goal of 98% closure established by the Human Health, Life Support, and Habitation Systems road map (OCT TA06).</p>
- API data.nasa.gov | Last Updated 2018-07-20T06:59:20.000Z
The key innovation proposed here is the use of agent-based modeling and simulation to evaluate the safety of the National Airspace under crisis operations and develop tools for real-time planning, scheduling, and resource allocation decision aids for crisis management. We view the problem as one of simulating and controlling the emergent behavior of autonomous agents (aircraft and air traffic service providers in this case) in crisis situations. We propose to use NASA's agent-based Airspace Concept Evaluation System as the modeling framework into which we will integrate our models. We propose to evaluate the impacts of these malicious agents on the safety of NAS by using simulation to assess short term and long term NAS-wide safety impacts in terms of loss of separation, near misses, collisions, re-routes, controller workload, and economic impacts. The agent-based system will provide a real-time planning, scheduling, and resource allocation decision aid to be used for crisis management, by providing the user capabilities to develop and execute playbooks that represent various policies. Finally, we propose to develop safety metrics that will provide command center traffic management coordinators indicators to predict off-nominal activities in the airspace.
- API data.nasa.gov | Last Updated 2018-07-20T07:10:03.000Z
This Small Business Innovation Research (SBIR) Phase I project will research a novel deformable mirror design for NASA adaptive optics telescope applications . The innovation offers reliable mechanics for the strained architecture, facilitating dynamic modeling and the control of the overall mirror system. A system-level finite element analysis and design optimization, in combination with proof-of-concept experimental verification methods, will be adopted to identify the most promising design for the future adaptive optics telescope systems. Focus will be given to improve the long time reliability and stability of the system while reducing thermal distortions for the mirror system. In Phase I, the proposed deformable mirror system will be designed and extensively modeled using finite element analysis technique to examine its electro-mechanical response, thermal-mechanical responses, and the various radiation-induced thermal-mechanical responses, respectively. Based on the design, Phase I will see the prototyping and testing of a 5x5 array sub-scale model.
Development of Diamond Vacuum Differential Amplifier for Harsh Environment Power Electronics, Phase Idata.nasa.gov | Last Updated 2018-07-19T08:22:20.000Z
Scientic, Inc., in collaboration with Vanderbilt University, proposes to develop a novel vacuum field emission differential amplifier (VFEDA) using low electron affinity nanodiamond (ND) material as electron emitters for high-power electronic application in harsh environments. The ND VFEDA is a fundamental circuit building block for vacuum integrated circuits (VICs) ideally suited for space applications. The proposed high-power nanodiamond-based VFEDA will be capable of operating over a wide-temperature range (-125 C to 450 C), possess tolerance to extreme doses of ionizing radiation and deliver the long-term reliability and stability needed to successfully execute environmentally stressful space science missions. Successfully developed, the proposed innovation will enhance NASA?s ability to reliably power spacecraft subjected to the harsh rigors of space, as-well-as autonomous systems engaged in the surface exploration of icy moons or operating in the high-temperature/high radiation environments of other solar bodies. It also has the potential to provide power components for nanosats and cubesats, thus improving the performance of systems engaged in near-Earth space science missions.
Prognostic and Fault Tolerant Reconfiguration Strategies for Aerospace Power Electronic Controllers and Electric Machines, Phase Idata.nasa.gov | Last Updated 2018-07-19T09:57:19.000Z
Impact Technologies proposes to develop a real-time prognostic and fault/failure accommodation system of critical electric power system components including power converters and electro-mechanical drives for the aerospace and aeronautical industry. The innovation of project is focused on the integration of emerging prognostic technologies with fault tolerant methodologies to improve system reliability and mission readiness for NASA's next generation electrical power systems. The proposed concept will utilize incipient fault detection techniques to provide longer predicted horizons prior to failures, and time to trigger the appropriate reconfiguration scheme. Impact Technologies' approach uses fault detection circuits and algorithms to analyze data from several sources including electrical and environmental measurements, model estimates, and usage conditions. Up-to-date assessments of the electrical system health and remaining useful life of critical components will be made possible via an on-board embedded processing system, which continuously updates prognostic models with sensed data and predicts the best fault accommodation strategy to meet mission objectives. The proposed electrical system fault prognosis and accommodation approach will be demonstrated with a Motor/Generator/Drive test bench adapted for use in this program and with data from the modern aerospace power system and electromechanical actuators.
- API data.nasa.gov | Last Updated 2018-07-19T05:14:54.000Z
This data set provides energetic (MeV) ion count rates and events measured by the Heavy Ion Counter (HIC) instrument on the Galileo spacecraft. The data are derived from the raw real-time science (RTS) data. There are two basic types of data files associated with the full-rate reduced data: Detector Count Rates and Events (Pulse Heights).
- API data.nasa.gov | Last Updated 2018-07-18T20:19:10.000Z
This grouping contains the incompressible-flow cases from the 1980-81 Data Library.
- API data.nasa.gov | Last Updated 2018-07-19T10:10:00.000Z
The integration of Unmanned Aircraft Systems (UAS) into the National Airspace System (NAS) requires a robust, reliable communication link between the Unmanned Aerial Vehicle (UAV) and its operators. Constant communication is a necessity. New and innovative approaches are needed to provide high-bandwidth Control and Non-Payload Communications (CNPC). To enable the CNPC system and increase the utility of UAS in the NAS, NuWaves Engineering has teamed up with Auriga Microwave (http://www.aurigamicrowave.com/) of Chelmsford, MA to propose the UAS Power amplifier for Extended range of Non-payload communication Devices (UPEND) project. UPEND combines a very high-efficiency radio frequency (RF) power amplifier (PA) with innovative linearization techniques in a miniature package capable of being integrated into UAS platforms as small as the venerable Boeing/Insitu ScanEagle. NuWaves' UPEND leverages advanced Monolithic Microwave Integrated Circuit (MMIC) technology, as well as efficiency and thermal design, to minimize size, weight, and power (SWaP) of a PA module, while maintaining the linear output required by complex modern communications waveforms, such as 802.16.
- API data.nasa.gov | Last Updated 2018-07-19T11:00:11.000Z
Radiation tolerant, extreme temperature capable electronics are needed for a variety of planned NASA missions. For example, in-situ exploration of Venus and long duration Europa-Jupiter missions will expose electronics to temperatures up to 500 Deg.C and radiation of 3 Mrad (Si) total dose. During this program, United Silicon Carbide will extend the capability of its SiC JFET integrated circuit fabrication technology to produce electronics compatible with such extreme environments. Silicon Carbide (SiC) junction field effect transistor (JFET) based electronics are ideal for these environments due to their excellent radiation tolerance and high performance and reliability over an extremely wide operating temperature range. SiC electronics can be used in applications ranging from low power, low noise mixed signal electronics for precision actuator control, sensor interfaces, and guidance and navigation electronics to power electronics for power management and distribution and power processing units. Systems built with SiC based electronics will have longer storage and operating lifetimes when compared to systems built with existing silicon electronics. Use of SiC integrated circuits will also lower system mass, volume, and power by reducing or eliminating the need for cooling and radiation shielding. In Phase I, we will perform measurements and modeling to show the feasibility of extending the capability of our SiC integrated circuit (IC) technology to meet NASA's extreme environment needs. In Phase II, we will fully develop the extreme environment capable SiC IC technology and demonstrate it through test and delivery of a high temperature, radiation hard, mixed signal sensor and control circuit. Following Phase II, we will provide access to the process technology and related design intellectual property through a commercial fabrication service so that NASA and others can fully leverage its capability.