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Termes IGN > sciences naturelles > physique > optique > optique physique > radiométrie > rayonnement électromagnétique > onde électromagnétique > onde métrique
onde métriqueSynonyme(s)très haute fréquence |
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Direction-of-arrival estimation of VHF signals recorded on the international space station and simultaneous observations of optical lightning / Hiroshi Kikuchi in IEEE Transactions on geoscience and remote sensing, vol 54 n° 7 (July 2016)
[article]
Titre : Direction-of-arrival estimation of VHF signals recorded on the international space station and simultaneous observations of optical lightning Type de document : Article/Communication Auteurs : Hiroshi Kikuchi, Auteur ; Takeshi Morimoto, Auteur ; Mitsuteru Sato, Auteur ; et al., Auteur Année de publication : 2016 Article en page(s) : pp 3868 - 3877 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection
[Termes IGN] interférométrie
[Termes IGN] onde métrique
[Termes IGN] orage
[Termes IGN] positionnement absolu
[Termes IGN] propagation ionosphérique
[Termes IGN] radiomètre à hyperfréquence
[Termes IGN] rayonnement électromagnétiqueRésumé : (Auteur) We report an initial investigation of the new location method of a very high frequency (VHF) radiation source, using signals recorded at the International Space Station. A VHF interferometer (VITF) has two VHF sensors. Locating lightning with VHF bands is useful to locate the position of the charge distribution in the thunderstorm. The location method of a radio source proposed used two direction-of-arrival estimation techniques. One is the interferometric technique, and another is based on the ionospheric propagation delay measurement of received signals. The combination of the two techniques provides two angular positions of the radiation source. When an altitude of a radiation source is assumed, we can determine two possible positions. One of the two positions was associated with the radiation source, while the other was not. In this paper, we compared the position of lightning and sprite imager (LSI) data, which are simultaneously captured during a lightning emission, with the locating position near the emission. The data set of the VITF within 100 ms of the optical lightning emission captured with the LSI was used. The temporally simultaneous event seems to be associated with the same lightning event. The estimated radiation positions were spatially in close agreement with the optical lightning positions captured with LSI, under nighttime ionosphere conditions. From statistical analysis, the spatial difference of the standard deviation changed from 15.3 to 30.8 km depending on the installation direction of the VHF sensors. The usefulness and limitations of the method are also discussed. Numéro de notice : A2016-874 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2016.2529658 En ligne : http://dx.doi.org/10.1109/TGRS.2016.2529658 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=83033
in IEEE Transactions on geoscience and remote sensing > vol 54 n° 7 (July 2016) . - pp 3868 - 3877[article]Range imaging of E-region field-aligned irregularities by using a multifrequency technique : validation and initial results / Jenn-Shyong Chen in IEEE Transactions on geoscience and remote sensing, vol 54 n° 7 (July 2016)
[article]
Titre : Range imaging of E-region field-aligned irregularities by using a multifrequency technique : validation and initial results Type de document : Article/Communication Auteurs : Jenn-Shyong Chen, Auteur ; Yen-Hsyang Chu, Auteur ; Ching-Lun Su, Auteur ; et al., Auteur Année de publication : 2016 Article en page(s) : pp 3739 - 3749 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s)
[Termes IGN] étalonnage d'instrument
[Termes IGN] fréquence multiple
[Termes IGN] ionosphère
[Termes IGN] onde métrique
[Termes IGN] radar imageurRésumé : (Auteur) This paper reports the first use of a multifrequency range imaging (RIM) technique for observing E-region field-aligned irregularities (FAIs) in the midlatitude ionosphere. The Middle and Upper atmosphere Radar (MUR; 34.85°N, 136.10°E) was used to conduct experiments with five equally spaced frequencies between 46.25 and 46.75 MHz. Three types of RIM data were examined: data with 13-element binary Barker codes, with 16-element binary complementary codes, and without phase codes. Moreover, two calibration approaches were adopted to validate the applicability of the RIM technique, which functioned as intended. Excellent RIM performance such as the ability to resolve several striations in an echo region of FAIs was demonstrated. However, sidelobe echoes caused by pulse coding mechanisms were occasionally observed at altitudes above and below the source regions in the coded data. Therefore, a procedure was developed according to one of the calibration approaches to identify and remove such kind of sidelobe echoes, which was shown to be applicable for the complementary-coded data. In addition to FAIs, a thin plasma layer with a thickness of approximately 1 km was identified as being structured with some tilted finer structures, which could not be observed in the original intensity images with a range resolution of 600 m. Preliminary estimates of the Doppler velocities indicated that a wind shear effect could be the cause of such tilted finer structures. Numéro de notice : A2016-870 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2016.2521702 En ligne : http://dx.doi.org/10.1109/TGRS.2016.2521702 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=83027
in IEEE Transactions on geoscience and remote sensing > vol 54 n° 7 (July 2016) . - pp 3739 - 3749[article]VHF propagation characterization during atmospheric disturbances / Jyotirmay Das in International Journal of Remote Sensing IJRS, vol 10 n° 7 (July 1989)
[article]
Titre : VHF propagation characterization during atmospheric disturbances Type de document : Article/Communication Auteurs : Jyotirmay Das, Auteur ; A.K. De, Auteur ; D.D. Majumder, Auteur Année de publication : 1989 Article en page(s) : pp 1227 - 1241 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Rayonnement électromagnétique
[Termes IGN] acoustique
[Termes IGN] effet atmosphérique
[Termes IGN] Inde
[Termes IGN] onde métrique
[Termes IGN] onde radioélectrique
[Termes IGN] orage
[Termes IGN] perturbation ionosphérique
[Termes IGN] rayonnement électromagnétique
[Termes IGN] réfraction atmosphériqueNuméro de notice : A1989-199 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/01431168908903960 En ligne : https://doi.org/10.1080/01431168908903960 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=25159
in International Journal of Remote Sensing IJRS > vol 10 n° 7 (July 1989) . - pp 1227 - 1241[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 080-89061 RAB Revue Centre de documentation En réserve L003 Disponible VHF radar remote sensing of atmospheric parameters over Taiwan during the time period of typhoon wayne / R.J. Hung in International Journal of Remote Sensing IJRS, vol 9 n° 3 (May 1988)
[article]
Titre : VHF radar remote sensing of atmospheric parameters over Taiwan during the time period of typhoon wayne Type de document : Article/Communication Auteurs : R.J. Hung, Auteur ; Y.D. Tsao, Auteur ; D.L. Johnson, Auteur ; A.J. Chen, Auteur ; C.H. Lin, Auteur Année de publication : 1988 Article en page(s) : pp 477 - 493 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection
[Termes IGN] cyclone
[Termes IGN] effet atmosphérique
[Termes IGN] effet Doppler
[Termes IGN] onde métrique
[Termes IGN] précipitation
[Termes IGN] radar
[Termes IGN] rétrodiffusion
[Termes IGN] Taïwan
[Termes IGN] télédétection en hyperfréquence
[Termes IGN] ventNuméro de notice : A1988-023 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/01431168808954869 En ligne : https://doi.org/10.1080/01431168808954869 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=24602
in International Journal of Remote Sensing IJRS > vol 9 n° 3 (May 1988) . - pp 477 - 493[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 080-88031 RAB Revue Centre de documentation En réserve L003 Disponible