Zobrazeno 1 - 10
of 12
pro vyhledávání: '"Matthew B. Longbrake"'
Autor:
Vincent Mancuso, Peter E. Buxa, Matthew B. Longbrake, Chi-Hao Cheng, David M. Lin, Lihyeh Liou, Thomas Pemberton
Publikováno v:
IET Radar, Sonar & Navigation. 9:743-750
To increase the bandwidth of a wideband receiver for surveillance applications, an in-phase/quadrature-phase (I/Q) channel-based receiver is a potential approach. However, the image caused by an imperfect coupler prevents the I/Q channel-based receiv
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::158be254af48e368917b7ed9b8e051b7
https://doi.org/10.1049/iet-rsn.2014.0347
https://doi.org/10.1049/iet-rsn.2014.0347
Autor:
Matthew B. Longbrake, Richard A. Freeman, Ryan J. Legge, Vadim Olen, Peter E. Buxa, Jeremiah D. Wolf, Wajih A. ElSallal, James B. West, Thomas W. Darymple
Publikováno v:
2013 IEEE International Symposium on Phased Array Systems and Technology.
The first part of this paper presents measured performance of the Balanced Antipodal Vivaldi Antenna (BAVA) with U-shaped metallic channels. This new BAVA array is dual polarized with decade bandwidth and wide scan volume. Its depth is half-wavelengt
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7b4a6fc0d37b3a457c47498464838435
https://doi.org/10.1109/array.2013.6731811
https://doi.org/10.1109/array.2013.6731811
Autor:
Matthew B. Longbrake
Publikováno v:
2012 IEEE National Aerospace and Electronics Conference (NAECON).
This paper showcases the benefits of true time-delay beamsteering for radar systems. The basics of array factor are reviewed and the problem of beam squint over wide bandwidths is shown. Available technologies to implement time-delay are discussed in
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::36eff3503400e6620dbd788430d403df
https://doi.org/10.1109/naecon.2012.6531062
https://doi.org/10.1109/naecon.2012.6531062
Autor:
David M. Lin, Peter E. Buxa, Lihyeh L. Liou, J. McCann, Matthew B. Longbrake, T. Pemberton, Stephen L. Hary, Thomas Dalrymple
Previous study has used chirp signals to characterize the RF response of a multi-channel RF receiver [1]. The results showed a significant channel imbalance. After applying a time-reversal filter, the channel imbalance was remedied and both phase and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::68b20502fd82ebae47816851071f3b33
https://zenodo.org/record/1277061
https://zenodo.org/record/1277061
Publikováno v:
NEWCAS
Hand-coding Fast Fourier Transforms (FFTs) in Hardware Description Language (HDL) is time consuming and prone to errors. Proprietary IP cores are available, however they are closed-source and unviewable. The open-source FFT generator SPIRAL is availa
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4c90e3956da94bc6a56bb9d9f663ee7c
https://doi.org/10.1109/newcas.2012.6329000
https://doi.org/10.1109/newcas.2012.6329000
Publikováno v:
NEWCAS
Fast Fourier Transforms (FFTs) are highly parallel in nature and consist of simple addition, subtraction, and complex rotation operators with phase factors (a.k.a. twiddle factors). With the advent of FPGAs and other reconfigurable seas-of-logic, it
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e16e0ea4b076a053e17ec8e57ba69835
https://doi.org/10.1109/newcas.2012.6328969
https://doi.org/10.1109/newcas.2012.6328969
Publikováno v:
ICECS
This paper describes a software tool for simulating and generating fully parallel generic VHDL representations of Fast Fourier Transforms. A comparison between parallel-parallel and serial-parallel butterflies is performed with emphasis on maximizing
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::71a2c68e8818ac45b5bf5ffdb3daebd6
https://doi.org/10.1109/icecs.2011.6122292
https://doi.org/10.1109/icecs.2011.6122292
Autor:
Matthew B. Longbrake, R. Drangmeister, Aji Mattamana, G.L. Creech, P. Orlando, Jonathan Buck, Thomas Dalrymple, Robert Neidhard, J. McCann, Tony Quach, Peter E. Buxa, Lenny Johnson, Kari Groves
Publikováno v:
2010 IEEE International Symposium on Phased Array Systems and Technology.
This paper describes the demonstration of a four-channel digital beamforming system incorporating highly integrated silicon germanium downconverter modules. The downconverter modules are designed to translate X-band frequencies (9 to 10.5 GHz) down t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d3b7562a28e090744d0fe8ccf811228c
https://doi.org/10.1109/array.2010.5613369
https://doi.org/10.1109/array.2010.5613369
Publikováno v:
Proceedings of the IEEE 2010 National Aerospace & Electronics Conference.
This paper describes the development of a software tool for simulating and generating fully parallel generic VHDL representations of Fast Fourier Transforms. Several fixed-point number optimizations are described with emphasis on maximizing speed and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::580094109f8e443fb28e79df7af38833
https://doi.org/10.1109/naecon.2010.5712968
https://doi.org/10.1109/naecon.2010.5712968
Publikováno v:
2010 IEEE Radar Conference.
The Multiple Signal Classification (MUSIC) algorithm is a powerful technique for determining the Direction of Arrival (DOA) of signals impinging on an antenna array. The algorithm is serial based, mathematically intensive, and requires substantial co
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1692697dbaa4f3cdd7bd6b0cb439ac51
https://doi.org/10.1109/radar.2010.5494559
https://doi.org/10.1109/radar.2010.5494559