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Expanding GNSS Testing with Multiple Synchronized Signal Recorders

In order to greatly expand recording bandwidth, you can deploy multiple tightly synchronized recorders in the field. Averna studied the example of two RP-5300 recorders (2x50 MHz channels each) that were synchronously inter-connected to form a virtual recorder with total bandwidth of 200 MHz.

Posted in: Electronics & Computers, White Papers

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Battery Fault Detection with Saturating Transformers

This monitoring system for high-power battery health could be useful for electric cars and the aerospace industry. Lyndon B. Johnson Space Center, Houston, Texas A monitoring network has been created that can be added to a battery consisting of many parallel cells. This network allows the health of individual cells, as measured by the current that they produce under load, to be monitored. If one or more cells are producing less current than the others, the network allows the discrepant cell(s) to be sensed and located.

Posted in: Electronics & Computers, Briefs, TSP

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Digitally Controlled, 12-V Precision Current Source for Extreme-Temperature Operation

NASA’s Jet Propulsion Laboratory, Pasadena, California Many control applications require precision, high-voltage-capable stimulus current drivers for sensor excitation. In particular, a requirement for a stimulus driver that can be primarily integrated into a motor feedback signal conditioning ASIC (application specific integrated circuit) for Martian environments is satisfied by this development.

Posted in: Electronics & Computers, Briefs, TSP

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Scandate Cathode for High-Power, Long-Life Electric Space Propulsion

Applications include electron beam-stimulated lasers for high-power video projection systems and new-generation CT-scan x-ray imaging systems. John H. Glenn Research Center, Cleveland, Ohio Scandate cathodes are able to produce about 20 times the emission of conventional all-tungsten cathodes at the same temperature. Conversely, they operate at about 200 °C lower temperature for the same emission. Scandate cathodes have been studied since at least the 1960s. Between then and 2002, numerous approaches were investigated. All cathodes either did not work or degraded within a few thousand hours. The current nanoparticle approach appears to have overcome previous shortcomings.

Posted in: Electronics & Computers, Briefs, TSP

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Hybrid Force/Stress Amplified Piezoelectric Energy Harvesting Transducer System

This design converts mechanical energy in the environment to electrical energy to power a device. Langley Research Center, Hampton, VA This innovation uses an active materials-based force-amplified mechanism and advanced piezoelectric materials for more efficient energy harvesting from mechanical shock and vibration. The harvested energy is stored in rechargeable batteries. The hybrid force/stress amplified transducer/actuator offers tens to hundreds of times higher electrical power output, up to ten times higher electromechanical energy conversion efficiency, and several orders of magnitude higher energy storage efficiency than conventional flex-tensional or multilayer stack transducers at the stress less than the fracture stress of the materials used in each element.

Posted in: Electronics & Computers, Briefs

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Improved Battery Health Monitoring

Applications include electric vehicles, medical devices, robotics, power systems, and underwater unmanned vehicles. Neil A. Armstrong Flight Research Center, Edwards, California Battery health monitoring is an emerging technology field that seeks to predict the remaining useful life (RUL) of battery systems before they run out of charge. Such predictive measures require interpretation of large amounts of battery status data within a Bayesian prognostic framework.

Posted in: Electronics & Computers, Briefs, TSP

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Space Modem GMSK Modulator

NASA’s Jet Propulsion Laboratory, Pasadena, California A high-rate GMSK (Gaussian Minimum Shift Keying) modulator was developed for space operation. Currently, multi-user modems are under development, and the GMSK modulator provides a way of packing more users within a space environment, especially for Mars exploration.

Posted in: Electronics & Computers, Briefs

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