Comparison of simultaneous line-of-sight signals at 9.6 and 34.5 GHz

Janes, H. B.; Thompson, M. C.; Smith, David A.; Kirkpatrick, Allison

doi:10.1109/tap.1970.1139715

Cited by 23 publications

(4 citation statements)

References 11 publications

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“…Of these the closest to a satellite-ground link was one having an elevation angle of 2.4 ø and a 64 km path length. Measurements of amplitude and phase at several frequencies up to 33.33 GHz over this path have been reported by Janes et al [1970] and by Thompson et al [ 1975]. Contributions to the theoretical understanding of some of the observed results were made by Ishimaru [ 1972].…”

Section: Introductionmentioning

confidence: 99%

ATS‐6 ascending: Near horizon measurements over water at 30 GHz

Vogel

Straiton²,

Fannin³

1977

Radio Science

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The return of the ATS‐6 satellite to a western longitude during the fall of 1976 presented a unique opportunity to perform low‐angle‐of‐elevation measurements at 30 GHz. For this purpose a receiver using a 1.5 m antenna was set up at Port Aransas, Texas, resulting in a propagation path entirely over water. The 30 GHz beacon was monitored daily for at least one hour from 8 September to 21 September 1976. During the time the elevation angle changed from 1.5° to 17.3°, the mean attenuation decreased from 20 to 2 dB and the standard deviation from over 6 dB to less than .2 dB. The deep fades at angles below 4° show significantly sharper nulls than peaks on a log scale. Spectra of the log amplitude fluctuations vary as the (−8/3) power of the spectral frequency in the limit. A flattening is noticeable at the low frequencies. A precipitation event at 8.5° elevation produced a 16 dB fade and significantly increased the variance.

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Section: Introductionmentioning

confidence: 99%

ATS‐6 ascending: Near horizon measurements over water at 30 GHz

Vogel

Straiton²,

Fannin³

1977

Radio Science

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“…Considerando a transmissão de uma onda plana linearmente polarizada, a equação escalar de onda correspondente pode ser resolvida pelo método de Rytov, expressando o fasor campo elétrico na forma (18) onde exp (1/10) representa o campo na ausência de turbulência e exp(I/IO representa um termo aleatório associado às flutuações do índice de refração.…”

Section: Funções Correlação Cruzada Das Log-flutuações De Amplitude Eunclassified

Cintilação em Ondas Milimétricas na Faixa de Absorção do Oxigênio - Funções Densidade Espectral Temporal

Mello¹,

Migliora²

1987

Journal of Communication and Information Systems

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e Carlos GL!.st :lVO S. Miglior a est e t rabalho apresenta um estudo. tG6rlco"Gr.per!manta! dos afoites observados, durante condlçl5es de turbulência atmosfêrlca, no sinal recebkío em er:!acas sm visibilidade qperando em freqOênclas sujoltas à absorção por gases na ia:xa de ondas ;r.~lmtHr!cas. E desenvolvi do um modelo teôrlco que permite caracterízar 2 clnt!!llção em termos de funçlles densidade espect ral temporal e OOS variâncias de amp!!tude e tece, Verifica-se que os modelos encontrados na lite ratura para efeitos de cl n~! !:lçlkJ em faixas de freqOêncla em que o mecaotsmo de absorção pode ser desprezado oonstltuem-se nlJ11 caso particular da presente teorla, Os resultados te6l' lc03 sãe comparados com rned!das de f lutuações de amp/ il ude e fase diferenciai real izadas em dois enlaces experimentais operando nas freq!lênclas de 55,5 e 36,1 GHz, compart ilhando um mesmo percurso de 4,1 km. L Revista da Sociedade Brasileira de Telecomunicaç ões Volume 2. N? 1, dezemb ro 1987 .

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“…Πρώτος ό Tatarski (1961) μελέτησε θεωρητικά τό φαινόμενο και τό συνέδεσε μέ τις μεταβολές πού παρατηρούνται στην τιμή τοΰ δείκτη διά-98 θλάσης. Στή συνέχεια μεγάλος αριθμός έρευνητών> προσπάθησε νά επαλη θεύσει πειραματικά, τή σχέση πού συνδέει τίς μετα3ολές τοϋ πλάτους τοϋ λαμβανομένου ηλεκτρομαγνητικού κύματος, μέ τίς παραμέτρους της τυρβώ δους ατμοσφαιρικής κατάστασης (Lane 1968), (Janes et al 1970), . Παράλληλα πολλοί ερευνητές προσπάθησαν νά εκμεταλλευθούν αντίστροφα τίς πληροφορίες των διακυμάνσεων ενός δικτύου, γιά νά υπο λογίσουν ατμοσφαιρικές παραμέτρους του μέσου διάδοσης (Beard et al 1969), ( Lee and Waterman 1968), (Ho et al 1978 β).…”

Section: γενικάunclassified

“…'Ανάλογες μετρήσεις ένιναν σέ τροπικά κλίματα κάτω από μεγάλη θερμοκρασία καί υγρασία, μέ αποτελέσματα πολύ ικανοποιητικά (Medeiros and Assia 1978). 'Επίσης έγιναν συγκριτικά πειράματα (Janes et al 1970) δύο δικτύων μέ διαφορετική συχνότητα στην [δια διαδρομή. Τά αποτελέσματα δδειξαν, ότι τά φάσματα του δικτύου πού έχει τή μεναλύτερη συχνότητα παρουσιά ζουν υψηλότερο ενεργειακό επίπεδο από τά αντίστοιχα τοΰ δικτύου μέ χα μηλή συχνότητα.…”

Section: 42'αποτελέσματα από δίκτυο 55 Ghzunclassified

Συμβολη Στη Μελετη Της Διαδοσης Μικροκυματων Μεσα Σε Τυρβωδη Ατμοσφαιρα - Ηλεκτρονικος Ανιχνευτης Ατμοσφαιρικων Αναταραξεων

Helmis¹,

Χέλμης²

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Comparison of simultaneous line-of-sight signals at 9.6 and 34.5 GHz

Cited by 23 publications

References 11 publications

ATS‐6 ascending: Near horizon measurements over water at 30 GHz

ATS‐6 ascending: Near horizon measurements over water at 30 GHz

Cintilação em Ondas Milimétricas na Faixa de Absorção do Oxigênio - Funções Densidade Espectral Temporal

Συμβολη Στη Μελετη Της Διαδοσης Μικροκυματων Μεσα Σε Τυρβωδη Ατμοσφαιρα - Ηλεκτρονικος Ανιχνευτης Ατμοσφαιρικων Αναταραξεων

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