Aperture-to-medium coupling on line-of-sight paths: Fresnel scattering

Levin, E.; Muchmore, R.; Wheelon, Albert D.

doi:10.1109/tap.1959.1144661

Cited by 6 publications

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References 10 publications

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“…The effect of aperture smoothing with a circular parabolic dish of radius a can be evaluated by the same integration technique used with the less ac-cW'ate geometrical optics solution [4,31].…”

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Radio-wave scattering by tropospheric irregularities

Wheelon¹

1959

J. RES. NATL. BUR. STAN. SECT. D. RAD. PROP.

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The subject of rad io-wave scatterin g by t urbulen t irregu lari t ies in t he t ropospheri c index of r efr action is r eviewed. D escriptions of t h e t urbulen t m edium a re con sidered first, togeth er wlth a st atus r eport on phys ical t heo ries for t he sp ectrum of irreg ul a ri ties. Ph a e and amplit ude scin t illations indu ced on electromagnetic waves p ro pagated a lo ng lin e-ofsigh t paths are dl sc ussed next. The compleme ntary problems of sig nal statistics a nd electromag netic-propagation calcul at ions a re s umma ri zed a nd co mpa red wi t h ava ilable data. Bot h t he geometrical optics and wave t heory a pproac hes a re di sc us ed. The theo r y of propagation beyond t he hori zon by scatter in g from t ile same irreg ul a ri t ies is t hen desc rihed. A curre nt re vi ew of the predi ction s for received power, signa l fluctuation s, an d a n tenn a effects is g ive n. The pape r is prima ri ly a r evie w of t he esse ntia l a nd a uxili a ry p redi ctions of scatte r t heo ry, b ut a lso co nta ins a co nsid erab le a moun t of unpublished re ear ch by t he a u t ho r. 1. Bessel: f(x) = xK1 (x) This correlation model was devised to predict: (a) The observed linear-wavelength dependence of average power for tropospheric scatter propagation; and (b) certain features of line-of-sight propagation experiments.

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