NDLI: A technique to study randomly varying media

Content Provider	IEEE Xplore Digital Library
Author	Thiede, E. Lusignan, B.
Copyright Year	1963
Abstract	A randomly varying medium causes both amplitude and phase fluctuations on a wave propagating through it. The time variations of the medium are shown to provide a mechanism for viewing isolated regions along the propagation path. A general technique for locating the refractive index variation regions and mapping their position versus distance along the propagation path is introduced in this paper. The novel feature of the new technique is that this mapping is obtained from an end view of the propagation path rather than an overview; thus, only one antenna is required at each end of the path. In developing the description of the technique, a nonlinear wave equation is derived to include the time variations in addition to the usual spatial variations. This equation leads to the retarded potential solution and to the autocorrelation function which is the desired mapping. The resolution of a source region in the medium is shown to be inversely proportional to its spectral bandwidth. An experiment atSband is proposed to measure filamentary electron density structures in the solar wind over a path length on the order of one AU. Processing ten hours of data will give a unity signal-to-noise ratio for 36 resolution cells in 4/10 of an AU path length or for 14 resolution cells in a one AU path length.
Sponsorship	IEEE Antennas and Propagation Society
Starting Page	99
Ending Page	103
Page Count	5
File Size	476958
File Format	PDF
ISSN	0018926X
Volume Number	18
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1970-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Random media Gold Signal resolution Fluctuations Refractive index Antennas and propagation Partial differential equations Nonlinear equations Autocorrelation Spatial resolution
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electrical and Electronic Engineering

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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