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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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At least 181 records · Page 10
All sourcesNASA NTRSDOE OSTI
DOE OSTI2022

ORC Tech Phase 2 Deliverable Report [Slides]

The New Mexico Small Business Assistance Program (NMSBA) has once again paired with Optical Radio Communications Technology (ORC Tech). A New Mexico startup Limited Liability Company (LLC), with Sandia National Laboratories (SNL) Engineers at the Sensors and Textiles Innovatively Tailored for Complex, High-Efficiency Detection (STITCHED) laboratory, to aid in the development of an ultra-passive, portable, deployable wireless signal booster technology.

42 ENGINEERING↗
DOE OSTI2022

Operation Fishbowl

Fishbowl’s primary objective was to generate data on electromagnetic pulses (EMP), the creation and behavior of auroras, and the impact of a high altitude nuclear burst on radio communications. Previous high altitude tests (Teak, Orange, and Yucca) were not instrumented to provide such data, which was deemed critical to countering any Soviet high altitude bursts. The first test of Fishbowl, Starfish Prime, exploded on July 9th with a yield of 1.4 megatons. Standing on Christmas Island, Austin McGuire witnessed the effects of the event.

45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEF↗
NASA NTRS1968

Ionosphere Investigations

Review of ionospheric research studies and impact of studies on understanding radio communications and solar terrestrial relationships

Alpert, Ya. L.↗
NASA NTRS1967

Closed loop ranging system Patent

Closed loop radio communication ranging system to determine distance between moving airborne vehicle and fixed ground station

Bunce, R. C.↗
NASA NTRS1973

Electromagnetic interference of power conditioners for solar electric propulsion

Electrical, multikilowatt power conditioning (PC) equipment needed on board a spacecraft utilizing solar electric propulsion creates an electromagnetic environment that is potentially deterimental to the science, navigation, and radio communication hardware. Within the scope of the solar electric propulsion system technology program, three lightweight, 2.5-kW PCs were evaluated in terms of their electromagnetic characteristics. It was found that the levels of radiated and conducted interference exceeded the levels anticipated for a solar electric propulsion mission. These noise emissions, however, were the result of deficient interference design in these models, rather than a basic inability to control interference in this type of PC.

Whittlesey, A. C.↗
NASA NTRS1973

Digital single-sideband modulation.

This paper considers digitized Weaver modulators for single-sideband modulation that can be used in radio communications and telemetering. A system of 12 such modulators to process 12 analog signals digitally is replaced by six multiplex modulators at the cost of additional computation at the input but with an overall reduction in computation time and a higher degree of accuracy. A unique digital filter is developed that can interpolate and output samples at multiples of the input sampling rate and exhibits a passband that occurs above the Nyquist frequency with no apparent distortion effects. A discussion of the Fortran simulation of a combined modulator-demodulator structure is included to verify the effectiveness of this scheme.

Singh, S.↗
NASA NTRS1973

An adaptive array for interference rejection.

An experimental adaptive array based on the feedback concept discussed by Widrow et al. (1967) is considered. The processing procedure described makes it possible to discriminate between 'desired' and 'undesired' signals by means of a reference signal. The application of this approach to the problem of interference rejection in radio communications is investigated. The reference signal in this case can only approximate the desired signal. A description is given of a number of experiments in which the desired signal is a modulated signal and the reference signal is a CW signal at the desired signal carrier frequency.

Riegler, R. L.↗
NASA NTRS1974

Intermediate memory devices

Several methods of transfer and processing of data whose practical implementation requires operational memory devices are described. Devices incorporating multistable elements are proposed and their main parameters are given. The possibility of using the proposed devices for storing information for transmission in space radio communications channels is examined.

Basalayev, G. V.↗
NASA NTRS1962

Precision frequency sources

The development of precision oscillators for time and frequency standards is discussed. The applications of the oscillators to radio communication, research projects, navigation systems, and calibration sources are reported. The status of a cesium beam stabilized oscillator is examined. Photographs of the components are provided. The performance of quartz and rubidium oscillators is compared with the performance of cesium resonators.

Mccoubrey, A. O.↗
NASA NTRS1975

Langley Research Center entry aerothermodynamic technology development in support of Pioneer Venus multiprobe mission studies

A program of entry aerothermodynamics has been conducted to support the Pioneer Venus multiprobe mission. Aspects of the study include radiative property data, radiative blockage effectiveness measurements, heating calculations, aerodynamic and convective heating studies, and radio communications blackout models. Some of the historical background for the investigation is reviewed, and recommendations are made concerning the use of the developed technology in probe design and the continuation of certain elements of the program.

Olstad, W. B.↗
NASA NTRS1979

Implementing OQASK by using MSK

Concept simplifies implementation of offset quadrature amplitude-shift-keyed signal when encoding digital information for transmission. Although originally developed for deep-space radio transmission, concept can find applications in various band-width constrained systems and in digital radio communications. Also is particularly useful in high volume data transmission as means of encoding and decoding.

Simon, M. K.↗
NASA NTRS1978

Improved LANDSAT to give better view of earth resources

The launch data of LANDSAT 3 is announced. The improved capability of the spacecrafts' remote sensors (the return beam vidicon and the multispectral scanner) and application of LANDSAT data to the study of energy supplies, food production, and global large-scale environmental monitoring are discussed along with the piggyback amateur radio communication satellite-OSCAR-D, the plasma Interaction Experiment, and the data collection system onboard LANDSAT 3. An assessment of the utility of LANDSAT multispectral data is given based on the research results to data from studies of LANDSAT 1 and 2 data. Areas studied include agriculture, rangelands, forestry, water resources, environmental and marine resources, environmental and marine resources, cartography, land use, demography, and geological surveys and mineral/petroleum exploration.

Source record↗
NASA NTRS1978

Extraterrestrial intelligence - An observational approach

The article surveys present and proposed search techniques for extraterrestrial intelligence in terms of technological requirements. It is proposed that computer systems used along with existing antennas may be utilized to search for radio signals over a broad frequency range. A general search within the electromagnetic spectrum would explore frequency, received power flux, spatial locations, and modulation. Previous SETI projects (beginning in 1960) are briefly described. An observation project is proposed in which the earth's rotational motion would scan the antenna beam along one declination circle in 24 hours. The 15 degree beam width would yield a mapping of 75% of the sky in an 8-day period if the beam were shifted 15 degrees per day. With the proposed instrument parameters, a sensitivity of about 10 to the -21 watt/sq m is achieved at a 0 degree declination and 1.5 GHz. In a second phase, a 26 m antenna would yield an HPBW of 0.8 degrees at 1 GHz and 0.03 degrees at 25 GHz. It is noted that the described technology would provide secondary benefits for radio astronomy, radio communications, and other fields.

Murray, B.↗
NASA NTRS1979

NASA technology for large space antennas

Technology developed by NASA in conjunction with industry for potential large, deployable space antennas with applications in communication, radio astronomy and earth observation is reviewed. Concepts for deployable antennas that have been developed to the point of detail design are summarized, including the advanced sunflower precision antenna, the radial rib antenna, the maypole (hoop/column) antenna and the parabolic erectable truss antenna. The assessment of state-of-the-art deployable antenna technology is discussed, and the approach taken by the NASA Large Space Systems Technology (LSST) Program to the development of technology for large space antenna systems is outlined. Finally, the further development of the wrap-rib antenna and the maypole (hoop/column) concept, which meet mission model requirements, to satisfy LSST size and frequency requirements is discussed.

Russell, R. A.↗