A fast implementation of the backpropagation and canonical transform methods for GPS occultations
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GPS backpropagation canonical transform fast metho↗
Engineering topics
Hajj, G. A.
Publications and source records attributed to Hajj, G. A..
Inversion methods for GPS occultations
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GPS radio occultation Abel inversion radioholograp↗
An emerging new direction in remote sensing for Earth science: the technology of GPS occultations
In this paper, we discuss recent technology developments that improve science return in the lowest 5 km of the atmosphere, an interesting region that is difficult to sound at high vertical resolution with other techniques from space.
GPS atmosphere remote sensing↗
An emerging new direction in remote sensing for Earth science: the technology of GPS occultations
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GPS atmosphere remote sensing↗
A database of upper air temperatures from GPS radio-occultations
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 occultations Earth atmosphere middle atmospher↗
A database of upper air temperature from GPS radio occultations
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GPS climate↗
Assessment of GPS signal multipath interface
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multipath reflection diffraction↗
Assessment of GPS signal multipath interference
We discuss the MUSTARD multipath simulator and its developments and its transmissions.
multipath reflection diffraction↗
Backpropagation processing of GPS radio occultation data
In this paper we provide an evaluation of the backpropagation method on simulated occultations as well as data collected by CHAMP and SAC-C.
GPS↗
Forward and inverse analyses of GPS radio occultations in the neutral atmosphere
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GPS radio occultation neutral atmosphere refractiv↗
GPS radio occultations coming of age: two spacecraft launches add two new instrumetns for climate monitoring
This paper talks about how 2 spacecraft launches add two new instrumetns for climate monitoring and GPS radio occultations.
GPS occultations Earth atmosphere↗
The GPS radio occulation technique
Radio occultation observations represent a planetary-scale optics experiment in which the atmosphere acts as a lens and alters the propagation velocity and paths of microwave signals passing through it.
pressure geopotential height water vapor GPS clima↗
A comparison of water vapor derived from GPS occultations and global weather analyses
Occultation measurements from the Global Positioning System (GPS) should improve upon this situation. Individual occultations yield profiles of specific humidity accurate to 0.2 to 0.5 g/kg providing sensitive measurements of lower and middle tropospheric water vapor with global coverage in a unique, all-weather, limb-viewing geometry with several hundred metres to a kilometre vertical resolution. The authors have derived water vapor profiles from June 21 to July 4, 1995
global↗
AMORE: An Autonomous Microsatellite Constellation Concept for Atmospheric and Ocean Observation
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atmospheric pressure ocean reflection GPS AMORE oc↗
Sensing Water Vapor via Spacecraft Radio Occultation Observations
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water vapor spacecraft radio occultation↗
Capabilities and Limitations of Radio Occultation Measurements for Ionosphere Monitoring
The paper: (1) describes the range of capabilities of GPS radio occultation missions in ionospheric research: (a) ionospheric profiling; (b) ionospheric imaging; (c) ionospheric data assimilation; and (d) measurement of scintillation. (2) Identify strengths and weaknesses of measurements: (a) coverage; (b) resolution; and (c) uniqueness of solution.
Hajj, G. A.↗
A Novel Approach to Atmospheric Profiling with a Down-looking Mountain-based or Air-borne GPS Receiver
We present a generalized raytracing inversion scheme which can be used when occultation data is acquired with a receiver within (e.g., on mountain top) or outside (i.e., in space) the atmosphere.
resolution profiles occultation↗