NDLI: A frequency-hopping approach for microwave imaging of large inhomogeneous bodies

Content Provider	IEEE Xplore Digital Library
Author	Chew, W.C. Lin, J.H.
Copyright Year	1995
Description	Author affiliation: Dept. of Electr. & Comput. Eng., Illinois Univ., Urbana, IL, USA (Chew, W.C.; Lin, J.H.)
Abstract	Microwave imaging involving large inhomogeneous bodies using inverse scattering technique is highly nonlinear. Therefore, as the body becomes larger compared to the wavelength, or when the contrasts of the inhomogeneity become larger, the nonlinear effect is more pronounced. However, this nonlinear effect is less pronounced at lower frequencies as opposed to high frequencies. For many practical applications, high quality data are collected at CW by time averaging. Multifrequency data can thus be collected, but the measurement time is linearly proportional to the number of frequency points at which the data are collected. We show the successful use of a small set of CW data measured over discrete frequencies. By using the image reconstructed from low frequency data as the initial guess to the higher frequency problem, the nonlinear effect can be mitigated. By slowly hopping from lower frequencies to higher frequencies, we can reconstruct objects which are as large as 10 wavelengths in diameter with high fidelity. The image reconstructed is much better than using the high-frequency data directly. Such a microwave imaging algorithm needs no a priori information about the inhomogeneous body.
Starting Page	1610
Ending Page	1613
File Size	277565
Page Count	4
File Format	PDF
ISBN	0780327195
DOI	10.1109/APS.1995.530887
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1995-06-18
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Microwave imaging Inverse problems Image reconstruction Scattering Permittivity Cost function Time domain analysis Frequency measurement Time measurement Wavelength measurement
Content Type	Text
Resource Type	Article

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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
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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