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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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This is a CSV spreadsheet containing UTM and Latitude and Longitude coordinates and elevations for Wells 78-32, 78B-32, 56-32, 58-32, 68-32, and 16A(78)-32 and seismic stations BOR1, BOR2, BOR3, FOR1, FOR2, FOR5, FOR6, FOR 7, FOR8, FORK, FORU, FORW, and FORB. These are from a GPS survey conducted by the Utah Geological Survey completed in December, 2021.
A science-quality space GPS receiver is being studied for the Primary Atomic Reference Clock in Space (PARCS) mission.
The launches of the CHAMP, SAC-C, and GRACE spacecraft have started a campaign of dense remote sensing of atmospheric refractivity profiles using GPS radio-occultations of the Earth's atmosphere.
GPS radio occultations captured by receivers on board the CHAMP and SAC-C spacecraft were used to study the evolution of temperature profiles in the Arctic region north of 65 degrees.
We have examined the characteristics of the GPS signal reflected off the sea ice surface and collected by an airborne or spaceborne receiver, forming a bistatic radar. The constellation of existing transmitters allows gathering bistatic reflections off the sea ice surface at different incidence angles over the course of a day, in contrast to a traditional radar that measures backscattering. We expect to see a strong coherent signal which is much higher than the incoherent one because of forward reflections from very smooth (particularly at L-band) and highly saline first year ice.
We quantify the amount of information on atmospheric water vapor that can be extracted from GPS line of sight measurement, by comparing these measurements to those made with acollocated pointed water vapor radiometer.
With the completion of the Global Positioning System and the appearance of affordable ground and spaceborne receivers, GPS is moving rapidly into the world of Earth science.
We describe a method based on the total deviation approach whereby we improve the confidence of the estimation of the Hadamard deviation that is used primarily in GPS operations.
The paper presents the fundamental characteristics of bistatic altimetry performed using the Global Positioning System (GPS) signal scattered off the ocean surface and collected by a receiver in space.
In recent years, the Global Positioning System (GPS) has been exploited via radio occultation techniques to obtain profiles of refractivity, temperature, pressure and water vapor in the neutral atmosphere and electron density in the ionosphere.
A detailed statistical analysis of the performance of the GPS broadcast ephemerides is presented, spanning 1992 to date.
At the upcoming IGS Governing Board meeting in Paris, Oct., 1996, the question of IGS participation in spaceborne GPS applications will be discussed.
In-situ GPS antenna phase center calibrations can be determined from several days of data from a single receiver.
Global ionospheric mapping (GIM) is a new, emerging technique for determining global ionospheric TEC (total electron content) based on measurements from a worldwide network of Global Positioning System (GPS) receivers.
Using the data from 12 SATLOC GPS stations which are nearly uniformly distributed over the US Continent, we have detected a significant ionospheric TEC disturbance in real time.
None given. Paper deals with radio occultation measurements using the Global Positioning System (GPS).
We describe here the components of a GPS-based system that is capable of providing near real time estimates of PWV (precipitable water vapor).
Modeling of the GPS satellite yaw attitude is a key element in high-precision geophysical applications.