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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 919 records · Page 51
All sourcesNASA NTRSDOE OSTI
NASA NTRS1998

Spacecraft to Spacecraft Coherent Laser Tracking as a Xylophone Interferometer Detector of Gravitational Radiation

Searches for gravitational radiation can be performed in space with two spacecraft tracking each other with coherent laser light. This experimental technique could be implemented with two spacecraft carrying an appropriate optical payload, or with the proposed broad-band, space-based laser interferometer detectors of gravitational waves operated in this non-interferometric mode.

interferometer↗
NASA NTRS1997

LITE Measurements of Sea Surface Directional Reflectance

The dependence of sea surface directional reflectance on surface wind speed from space-based lidar measurements of sea surface backscatter. In particular lidar measurements in the nidir angle range from 10-30 degrees appear to be most sensitive to surface wind speed variability in the regime below 10m/s.

Sea Surface Wind Speed↗
NASA NTRS1997

Optical design, modeling, and tolerancing of a Fizeau interferometer dedicated to astrometry

Space-based interferometers dedicated to wide-angel astrometry would dramatically increase the accuracy of angular measurement fundamental to a wide range of astrophysical problems. The propsosed global Astrometric Interferometer for Astrophysics (GAIA) a continuously rotating instruments comprising two or three interferometers, will reach the 5-20 mue as level on more that 35 million objects.

Optical Design Fizeau Interferometer↗
NASA NTRS1996

Space VLBI Co-Observing Developments in the DSN

The JPL/NASA Deep Space Network (DSN) plans to participate in the upcoming Space VLBI missions by using its 70m antenna time to co-observe with space-based radio telescopes. To enhance this support, the DSN is upgrading its radio astronomy equipment at L- and K-band, its VLBI recorders, and its computers and software for co-observing operations.

telescopes radio astronomy Jet Propulsion Laborato↗
NASA NTRS1995

Development of Flight Hardware for an Inflatable Deployable Antenna Experiment

Space deployable antennas are needed for a variety of applications that include space based very-long-baseline interferometry, mobile communications, active microwave sensing, earth observation radiometry, synthetic aperture radar, spacecraft communications, and DOD space-based radar. Design and development concepts discussed are low cost, reliability, low weight, packaging, precision and stability.

Space Antennas Structures Materials↗
NASA NTRS1994

The Astrometric Imaging Telescope Optical System

This oral presentation describes the Astrometric Imaging Telescope as a space-based observatory designed to detect and study planetary systems and circumstellar material around hundreds of nearby stars.

N/A↗
NASA NTRS1994

Static Shape Control of Inflatable Structures

Inflatable structural concepts have been proposed for numerous applications such as antennas for microwave remote sensing, space-based interferometry, solar concentrators, and for dual purposes (e.g. concentrator for power/antenna for communication). In comparison to other mechanically deployable systems, inflatable structures have significant advantages of a much lower cost, weight, and packaging volume, but higher deployment reliability and damping properties.

Inflatable structures↗
NASA NTRS1998

Extratropical Influence of Upper Tropospheric Water Vapor on Greenhouse Warming

The purpose of this paper is to re-examine the impact of upper tropospheric water vapor on greenhouse warming in midlatitudes by analyzing the recent observations of the upper tropospheric water vapor from the Microwave Limb Sounder (MLS) on the Upper Atmosphere Research Satellite (UARS), in conjuction with other space-based measurement and model simulation products.

upper troposphere water vapor greenhouse warming↗
NASA NTRS1994

Two-Dimensional Interdigitated Pixel Detector for Energetic Particle Spectrometers

This paper describes a type of cosmic ray detector suitable for the construction of a small, low power space-based instrument to detect the energy and isotope of energetic nuclei, such as those produced by solar flares. The detector is similar to previous types of silicon PIN detectors where the fully depleted body of the wafer comprises intrinsic region of the PIN structure. The novel aspect of this detector is that the one surface is divided into a two-dimensional array of pixels, and that the collected holes are divided between a row and a column collector in each pixel, yielding both dimensions of position information from this side of the detector.

cosmic↗
NASA NTRS1998

Deep Space 3 Metrology System

A metrology subsystem on board the Deep Space 3, a separated interferometer mission, is used to determine stellar fringe delay jitter, delay rate, and intial delay.

Deep↗