Engineering topics
Hajj, G.
Publications and source records attributed to Hajj, G..
Cosmic GPS ionospheric sensing and space weather
As our civilization becomes more dependent on space based technologies, we become more vulnerable to conditions in space weather. Accurate space weather specification and forecasting require proper modeling which account for the coupling between the sun, the magnetosphere, the thermosphere, the ionosphere and the mesosphere.
Theoretical Description of a Bistatic System for Ocean Altimetry Using the GPS Signal
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.
A Technical Description of Atmospheric Sounding by GPS Occultation
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 Novel Approach to Atmospheric Profiling with a Down-Looking Mountain-Based or Air-Borne GPS Receiver
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A Novel Approach to Ocean Altimetry Ulitizing the GPS Signa
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A Novel Approach to Ocean Altimetry Utilizing the GPS Signal
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A Novel Approach to Atmospheric Profiling with a Mountain-Based or Air-Borne GPS Receiver
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Capabilities and Limitations of Radio Occultation
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Active Tropospheric Ozone and Moisture Sounder (ATOMS): Trade Study Final Report
The success of the GPS atmospheric occultation technique, first performed on the GPS/MET flight experiment aboard NASA's MicroLab-1 spacecraft, has established the potential of active radio occultation sounding.
AMORE: An Autonomous Microsatellite Constellation for Atmosphere and Ocean Observation
The Atmospheric Moisture and Ocean Reflection Experiment-AMORE-is a proposed constellation of microspacecraft for atmospheric and ocean observation.
GPS Ocean Surface Reflection Technology Requirements for Space Applications
Two key NASA OES research objectives are the Seasonal to Interannual Climate Variability and Prediction and Long-Term Climate/Natural Variability and Change investigations.
Applications and Accuracy of Radio Occultation Observations Using GPS
The radio occultation technique has been used to characterize planetary atmospheres since the 1960's spanning atmospheric pressures from several bars to 16 microbars.
An International Strategy for Geopotential Field Study and GPS Earth Sounding
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A New Approach to Isolating External Magnetic Field Components in Spacecraft Measurements of the Earth's Magnetic Field Using Global Positioning System observables
We review the problem of separating components of the magnetic field arising from sources in the Earth's core and lithosphere, from those contributions arising external to the Earth, namely ionospheric and magnetospheric fields, in spacecraft measurements of the Earth's magnetic field.
Assessment of GPS Occultations for Atmospheric Profiling
the concept of utilizing the global positioning system signals as a means of sensing the atmosphere has been studied in some detail in the literature.