The reflection coefficient of the Earth's surface for radio waves

McPetrie, J.S.

doi:10.1049/jiee-1.1938.0031

Cited by 6 publications

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“…McPetrie ( 1938) gives the complex reflection coefficient as a function of these parameters both for polarization in the plane of incidence and perpendicular to it, components into which a ny pol arization may be resolved. McPetrie's curves may be extended for relative permittivities of less than one to cover all possible subglacial materials (e.g.…”

Section: Discussion Oj Resultsmentioning

confidence: 99%

Depolarization of Radio Waves can Distinguish between Floating and Grounded Ice Sheets

Woodruff

Doake

1979

J. Glaciol.

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ABSTRACT. Pola r ice is now thought to be m~rginally birefringent at radio echo-sounding frequen cies.An experiment on the polarization behaviour of 60 MHz radio echoes from the bed of both ice shelf and land ice in Antarctica sh owed a marked differen ce in th e r eturn ed polarizatio n. It appears that differences in electrical properties o r roughness of the r efl ecting boundary cannot explain o ur results. We suggest that there is a large change in the birefringence of the ice sheet at the hinge zone, ca used by the effect o f tidal strain on crysta l o ri e ntati on. This would impl y a minimum value of the radio-frequency an isotropy in p ermittivity for the single crystal of (0. 52 ± 0.8 )% . Therefor e polarization changes could allow fl oating and g rounded ice to be distinguished. R ESUME . L a dep olarisation des olldes radio p eut distinguer entre les couches de glace fiottantes et celles reposant sur le sol.On pen se maintenant que la glace pola ire est, accessoirement birefringente a ux frequences des sondages p ar echo radio . Une experien ce sur le comportement a la pola risation d'echos radio de 60 MHz par le lit d ' une glace de mer et d'une glace de terre dans I' Antarctique a montre une difference sensibl e dans la polarisation d es ondes renvoyees. Il semble que les differences dans les proprietes electriques et dans la rugosite d e la surface reflechissante ne p euvent explique r nos resultats. Nous suggerons qu' il y a un changement important dans la birefringence de la couverture d e glace a la zone charni er e a cause de I'effet des efforts dus a la maree sur I' orientation des crista ux . Ceci impliquerait une valeur minimum de I'aniso tropi e a la permitti vite de la fn' quence radio pour le monocristal d e (0,52 ± 0,8)% . Par consequent, d es ch angements de p olarisation pourra ient permettre de distinguer les glaces flottantes et les glaces d e terre.ZUSAMMENFASSUNG. D epolarisation von R adarwellen als Unterscheidullgsmerkmal VOIl schwimmendem und

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Section: Discussion Oj Resultsmentioning

confidence: 99%

Depolarization of Radio Waves can Distinguish between Floating and Grounded Ice Sheets

Woodruff

Doake

1979

J. Glaciol.

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“…In general, the amplitude and phase of a reflected wave depend on the electrical properties of the transmitting and reflecting medium, the angle of incidence (i ), and the pola rization of the incident wave. McPetrie ( 1938) gives the complex reflection coefficient as a function of these parameters both for polarization in the plane of incidence and perpendicular to it, components into which a ny pol arization may be resolved. McPetrie's curves may be extended for relative permittivities of less than one to cover all possible subglacial materials (e.g.…”

Section: Discussion Oj Resultsmentioning

confidence: 99%

Depolarization of Radio Waves can Distinguish between Floating and Grounded Ice Sheets

Woodruff

Doake

1979

J. Glaciol.

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Polar ice is now thought to be marginally birefringent at radio echo-sounding frequencies. An experiment on the polarization behaviour of 60 MHz radio echoes from the bed of both ice shelf and land ice in Antarctica showed a marked difference in the returned polarization. It appears that differences in electrical properties or roughness of the reflecting boundary cannot explain our results. We suggest that there is a large change in the birefringence of the ice sheet at the hinge zone, caused by the effect of tidal strain on crystal orientation. This would imply a minimum value of the radio-frequency anisotropy in permittivity for the single crystal of (0.52±0.8)%. Therefore polarization changes could allow floating and grounded ice to be distinguished.

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A method of using horizontally polarized waves for the calibration of short-wave field-strength measuring sets by radiation

McPetrie

Pressey

1938

Institution of Electrical Engineers - Proceedings of the Wireless Section of the Institution

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The reflection coefficient of the Earth's surface for radio waves

Cited by 6 publications

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Depolarization of Radio Waves can Distinguish between Floating and Grounded Ice Sheets

Depolarization of Radio Waves can Distinguish between Floating and Grounded Ice Sheets

Depolarization of Radio Waves can Distinguish between Floating and Grounded Ice Sheets

A method of using horizontally polarized waves for the calibration of short-wave field-strength measuring sets by radiation

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