Zobrazeno 1 - 10
of 27
pro vyhledávání: '"Brian M. Worthmann"'
Autor:
David S. Perlmutter, David W. Paglieroni, Steven W. Bond, Christian T. Pechard, Brian M. Worthmann, Garrett A. Stevenson, David H. Chambers, Jeffrey E. Mast
Publikováno v:
IEEE Transactions on Geoscience and Remote Sensing. 59:7957-7967
Multistatic ground-penetrating radar (GPR) signals can be imaged tomographically to produce three-dimensional distributions of image intensities. In the absence of objects of interest, these intensities can be considered to be estimates of clutter. T
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::28776b640ad5261a9696fbdfe269399d
https://doi.org/10.1109/tgrs.2021.3051566
https://doi.org/10.1109/tgrs.2021.3051566
Publikováno v:
IEEE Transactions on Geoscience and Remote Sensing. 59:4717-4724
This article presents a novel investigation into the effect of receiver timing jitter on the quality of imaging of ground-penetrating radar systems. We explicitly show the impact of timing jitter throughout an entire example processing pipeline. The
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a59aff14d04768a4e9b1a7329d6ed71a
https://doi.org/10.1109/tgrs.2020.3019976
https://doi.org/10.1109/tgrs.2020.3019976
Autor:
Brian M. Worthmann, David J. Geroski
Publikováno v:
The Journal of the Acoustical Society of America. 149:868-884
Frequency-differencing, or autoproduct processing, techniques are one area of research that has been found to increase the robustness of acoustic array signal processing algorithms to environmental uncertainty. Previous studies have shown that freque
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a2e1e80e0de74507466672515fd2b179
https://doi.org/10.1121/10.0003383
https://doi.org/10.1121/10.0003383
Autor:
David R. Dowling, Brian M. Worthmann
Publikováno v:
The Journal of the Acoustical Society of America. 147:1863-1873
The autoproducts are nonlinear mathematical constructs developed from acoustic fields with non-zero bandwidth. When averaged through the field's bandwidth, the autoproducts may mimic a genuine acoustic field at frequencies that are lower or higher th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b7b4a0f2766f54c47b296e648d679c5b
https://doi.org/10.1121/10.0000953
https://doi.org/10.1121/10.0000953
Comparing the observed brightness of various buried objects is a straightforward way to characterize the performance of a ground penetrating radar (GPR) system. However, a limitation arises. A simple comparison of buried object brightness values does
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e43fb65ebb74697d3a0a580092d264f4
Autor:
David R. Dowling, Brian M. Worthmann
Publikováno v:
The Journal of the Acoustical Society of America. 147(6)
Quadratic products of complex amplitudes from acoustic fields with nonzero bandwidth, denoted "autoproducts," can mimic acoustic fields at frequencies lower or higher than the bandwidth of the original field. While this mimicry has been found to be v
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::85609532cb6bf3d5793d37b090bf2eae
https://pubmed.ncbi.nlm.nih.gov/32611188
https://pubmed.ncbi.nlm.nih.gov/32611188
Publikováno v:
The Journal of the Acoustical Society of America. 143:2419-2427
Conventional frequency-domain acoustic-field analysis techniques are typically limited to the bandwidth of the field under study. However, this limitation may be too restrictive, as prior work suggests that field analyses may be shifted to lower or h
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f0c92d15745cee1dc2eb7220d122176e
https://doi.org/10.1121/1.5032200
https://doi.org/10.1121/1.5032200
Publikováno v:
The Journal of the Acoustical Society of America. 141:543-556
Remote source localization in the shallow ocean at frequencies significantly above 1 kHz is virtually impossible for conventional array signal processing techniques due to environmental mismatch. A recently proposed technique called frequency-differe
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f5aa3df1ad7f1b4d4c7dcde4bfcdb48f
https://doi.org/10.1121/1.4973955
https://doi.org/10.1121/1.4973955
Autor:
Brian M. Worthmann, David R. Dowling
Publikováno v:
The Journal of the Acoustical Society of America. 141(6)
The frequency-difference and frequency-sum autoproducts are quadratic products of solutions of the Helmholtz equation at two different frequencies (ω+ and ω-), and may be constructed from the Fourier transform of any time-domain acoustic field. Int
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e515f838d7a35c8c8cedb68c4a2131ed
https://pubmed.ncbi.nlm.nih.gov/28679272
https://pubmed.ncbi.nlm.nih.gov/28679272