Mapping of radiosonde-derived clear air climatic parameters using neural modelling techniques

Hayton, T.G.; Craig, K.H.

doi:10.1049/cp:19970393

Cited by 3 publications

(2 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Standard atmospheric input parameters are used for oxygen attenuation. For water vapour attenuation, values of air temperature and water vapour density that are exceeded for 1, 10 and 50 per cent of the time, are derived from radiosonde ascents at weather stations around the world and then transformed into global maps which have a resolution of 23;23 [15]. Estimates of temperature and water vapour density for other percentage times are generated by performing logarithmically scaled interpolations from these data sets.…”

Section: Prediction Of Attenuation Due To Gasmentioning

confidence: 99%

Comparison of various methods for combining propagation effects and predicting loss in low‐availability systems in the 20–50 GHz frequency range

Castanet

Lemorton

Konefal

et al. 2001

Int. J. Satell. Commun.

View full text Add to dashboard Cite

SUMMARYThe objective of this paper is to demonstrate the interest of using &combined' prediction models of attenuation (combinations of single propagation e!ects) for new Ka, V or EHF SatCom systems. These models allow to calculate the attenuation due to gases, clouds, rain and the melting layer. To reach this objective, results of recent propagation campaigns carrying out radioelectrical links in the 20}50 GHz frequency range are used as references. Results from three di!erent propagation experiments are considered in this paper: OLYMPUS results obtained from the DBOPEX database, ITALSAT results obtained by Rutherford Appleton Labs at Chilton (UK) and CELESTE results obtained by ONERA in South of France.

show abstract

Section: Prediction Of Attenuation Due To Gasmentioning

confidence: 99%

Comparison of various methods for combining propagation effects and predicting loss in low‐availability systems in the 20–50 GHz frequency range

Castanet

Lemorton

Konefal

et al. 2001

Int. J. Satell. Commun.

View full text Add to dashboard Cite

show abstract

“…In recent years, the vertical resolution of radiosonde data can reach the meter level. Hayton and Craig (1997) used WMO radiosonde data to analyze the distribution of atmospheric ducts worldwide. However, radiosondes are unable to measure atmospheric ducts continuously.…”

Section: Introductionmentioning

confidence: 99%

Atmospheric Duct Detection Using Wind Profiler Radar and RASS

Hua¹,

Shi-peng²,

Tang³

et al. 2019

Journal of Atmospheric and Oceanic Technology

View full text Add to dashboard Cite

A method of detecting atmospheric ducts using a wind profiler radar (WPR) and a radio acoustic sounding system (RASS) is proposed. The method uses the RASS to measure the virtual temperature profile and calculate the Brunt–Väisälä frequency; it also uses the WPR to measure the spectral width of the atmosphere and the atmospheric refractive index structure constant. Then the profile of the atmospheric refractive index gradient and modified refractivity are calculated using virtual temperature, spectral width, and the atmospheric refractive index structure constant. Finally, the height and intensity of the atmospheric duct are calculated to achieve continuous monitoring of the atmospheric duct. To verify the height and intensity of the atmospheric duct, comparison experiments between WPR-RASS and radiosondes were carried out from June 2014 to June 2015 in Dalian, Liaoning Province, China. The results show that the profile of modified refractivity by WPR-RASS has exactly the same trend as the radiosondes, the two methods have a good consistency, and the atmospheric duct value from WPR-RASS is in good agreement with that from radiosondes.

show abstract