Radio Propagation and Adaptive Antennas for Wireless Communication Links

Blaunstein, Nathan; Christodoulou, C.G.

doi:10.1002/0470069996

Cited by 70 publications

(131 citation statements)

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“…Since the amplitude of fluctuations of the RO signals considered are characterized by σ 2 I < 1, the Rytov variance is valid for the present analysis. Note that the Rytov variance was used to describe characteristics of weak scintillation of radio and microwave propagation in the atmosphere (Clifford and Strohbehn, 1970;Woo and Ishimaru, 1973;Ishimaru, 1978;Martini et al, 2006;Blaunstein and Christodoulou, 2007). For plane waves, σ 2 I is proportional to C 2 n (Andrews et al, 1999):…”

Section: The Index Of Refraction Structure Parametermentioning

confidence: 99%

Remote sensing of tropospheric turbulence using GPS radio occultation

Shume

2016

Atmos. Meas. Tech.

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Abstract. Radio occultation (RO) measurements are sensitive to the small-scale irregularities in the atmosphere. In this study, we present a new technique to estimate tropospheric turbulence strength (namely, scintillation index) by analyzing RO amplitude fluctuations in impact parameter domain. GPS RO observations from the COSMIC (Constellation Observing System for Meteorology, Ionosphere, and Climate) satellites enabled us to calculate global maps of scintillation measures, revealing the seasonal, latitudinal, and longitudinal characteristics of the turbulent troposphere. Such information are both difficult and expensive to obtain especially over the oceans. To verify our approach, simulation experiments using the multiple phase screen (MPS) method were conducted. The results show that scintillation indices inferred from the MPS simulations are in good agreement with scintillation measures estimated from COSMIC observations.

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Section: The Index Of Refraction Structure Parametermentioning

confidence: 99%

Remote sensing of tropospheric turbulence using GPS radio occultation

Shume

2016

Atmos. Meas. Tech.

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“…All these effects result in loss of the signal energy and degrade the performance and reliability of LMS communications links. A detailed discussion about local effects on LMS communication links can be found in (Goldhirsh & Vogel, 1998;Blaunstein & Christodoulou, 2007).…”

Section: Local Effectsmentioning

confidence: 99%

Characterisation and Channel Modelling for Mobile Satellite Communication Systems

Mehmood¹,

Mohammed²

2010

Satellite Communications

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“…Density variations of ionised particles in the ionosphere modify electromagnetic wave propagation: waves are refracted, thus having an increased physical path length (Blaunstein & Christodoulou 2007). At times of enhanced solar activity severe changes in ionospheric and thermospheric properties have been observed, often causing perturbations of communication signals as well as of Global Navigation Satellite Systems (GNSS; e.g.…”

Section: Introductionmentioning

confidence: 99%

“…Signals undergo several kinds of alteration when propagating in the ionosphere, even in geomagnetically calm periods through refraction, Faraday rotation, group delay and dispersion. Concerning radio waves used in satellite communication, Faraday rotation is negligible (a few degrees) and dispersion is weak (a dozen picoseconds per one megahertz) (Blaunstein & Christodoulou 2007). Thus, ADONIS will focus on refraction and group delay with occultation measurements.…”

Section: Introductionmentioning

confidence: 99%

Atmospheric Drag, Occultation ‘N’ Ionospheric Scintillation (ADONIS) mission proposal

Hettrich

Kempf

Perakis

et al. 2015

J. Space Weather Space Clim.

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The Atmospheric Drag, Occultation 'N' Ionospheric Scintillation mission (ADONIS) studies the dynamics of the terrestrial thermosphere and ionosphere in dependency of solar events over a full solar cycle in Low Earth Orbit (LEO). The objectives are to investigate satellite drag with in-situ measurements and the ionospheric electron density profiles with radio occultation and scintillation measurements. A constellation of two satellites provides the possibility to gain near real-time data (NRT) about ionospheric conditions over the Arctic region where current coverage is insufficient. The mission shall also provide global highresolution data to improve assimilative ionospheric models. The low-cost constellation can be launched using a single Vega rocket and most of the instruments are already space-proven allowing for rapid development and good reliability. From July 16 to 25, 2013, the Alpbach Summer School 2013 was organised by the Austrian Research Promotion Agency (FFG), the European Space Agency (ESA), the International Space Science Institute (ISSI) and the association of Austrian space industries Austrospace in Alpbach, Austria. During the workshop, four teams of 15 students each independently developed four different space mission proposals on the topic of ''Space Weather: Science, Missions and Systems'', supported by a team of tutors. The present work is based on the mission proposal that resulted from one of these teams' efforts.

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Radio Propagation and Adaptive Antennas for Wireless Communication Links

Cited by 70 publications

References 0 publications

Remote sensing of tropospheric turbulence using GPS radio occultation

Remote sensing of tropospheric turbulence using GPS radio occultation

Characterisation and Channel Modelling for Mobile Satellite Communication Systems

Atmospheric Drag, Occultation ‘N’ Ionospheric Scintillation (ADONIS) mission proposal

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