NASA Scientific and Technical Aerospace Reports - The University ...
NASA Scientific and Technical Aerospace Reports - The University ...
NASA Scientific and Technical Aerospace Reports - The University ...
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configurations. Methods include h<strong>and</strong> calculations, PSPICE simulations, Microstripes transient field solver, <strong>and</strong> empirical<br />
measurement. In total, four representative physical configurations are examined, including a single wire over a ground plane,<br />
a twisted pair over a ground plane, generator plus receptor wires inside a cylindrical conduit, <strong>and</strong> a single receptor wire inside<br />
a cylindrical conduit. Part 1 addresses the first two cases, <strong>and</strong> Part 2 addresses the final two. Agreement between the analysis<br />
methods <strong>and</strong> test data is shown to be very good.<br />
Author<br />
Crosstalk; Simulation; Electric Wire; Comparison; Electric Generators; Mathematical Models<br />
20100017494 C <strong>and</strong> P Technologies, Inc., Closter, NJ USA<br />
Effect of B<strong>and</strong>width on Wideb<strong>and</strong>-Stap Performance (Preprint)<br />
Li, Ke Yong; Pillai, Unnikrishna S.; Guerci, Joseph R.; Proceedings of the 41st Asilomar Conference on Signals, Systems, <strong>and</strong><br />
Computers; October 2007; 6 pp.; In English; 41st Asilomar Conference on Signals, Systems, <strong>and</strong> Computers,4-7Nov2007,<br />
Pacific Grove, CA, USA; Original contains color illustrations<br />
Contract(s)/Grant(s): FA8750-06-C-0117; Proj-5017; 62204F<br />
Report No.(s): AD-A517461; AFRL-TP-2009-1304; No Copyright; Avail.: Defense <strong>Technical</strong> Information Center (DTIC)<br />
A wideb<strong>and</strong> signal occupies a finite b<strong>and</strong>width that is significant compared to its carrier frequency. As a result, when<br />
transmitted, its returns cause b<strong>and</strong>width dispersion across the antenna. It is shown here that the effect of the finite b<strong>and</strong>width<br />
is to introduce a set of uncorrelated return signals for every physical scatter in the field. Further, each such uncorrelated return<br />
contains a set of coherent signals with different directional <strong>and</strong> Doppler components that result from a jittering effect both in<br />
angle <strong>and</strong> Doppler domain. As a result, adaptive clutter cancellation using traditional processing schemes does not work well.<br />
Although in principle it is possible to correct these decorrelating effects by 3D spacetime adaptive processing (STAP), the<br />
present day methods are quite costly <strong>and</strong> difficult to implement. In addition to the new wide b<strong>and</strong> signal modeling framework<br />
mentioned above, we outline a hierarchical processing scheme which has the potential for dramatically reducing both<br />
processing <strong>and</strong> sample support burdens.<br />
DTIC<br />
Adaptation; B<strong>and</strong>width; Broadb<strong>and</strong>; Clutter; Doppler Effect; Scattering; Signal Processing; Space-Time Adaptive Processing<br />
20100017495 C <strong>and</strong> P Technologies, Inc., Closter, NJ USA<br />
Effect of B<strong>and</strong>width on Wideb<strong>and</strong>-STAP Performance (Briefing Charts)<br />
Li, Ke Yong; Pillai, S. Unnikrishna; Guerci, Joseph R.; Proceedings of the 41st Asilomar Conference on Signals, Systems, <strong>and</strong><br />
Computers; October 2007; 19 pp.; In English; 41st Asilomar Conference on Signals, Systems, <strong>and</strong> Computers, 4-7Nov.<br />
2007, Pacific Grove, CA, USA; Original contains color illustrations<br />
Contract(s)/Grant(s): FA8750-06-C-0117; Proj-5017; 62204F<br />
Report No.(s): AD-A517460; AFRL-RY-WP-TP-2009-1303; No Copyright; Avail.: Defense <strong>Technical</strong> Information Center<br />
(DTIC)<br />
A wideb<strong>and</strong> signal occupies a finite b<strong>and</strong>width that is significant compared to its carrier frequency. As a result, when<br />
transmitted, its returns cause b<strong>and</strong>width dispersion across the antenna. It is shown here that the effect of the finite b<strong>and</strong>width<br />
is to introduce a set of uncorrelated return signals for every physical scatter in the field. Further, each such uncorrelated return<br />
contains a set of coherent signals with different directional <strong>and</strong> Doppler components that result from a jittering effect both in<br />
angle <strong>and</strong> Doppler domain. As a result, adaptive clutter cancellation using traditional processing schemes does not work well.<br />
Although in principle it is possible to correct these decorrelating effects by 3D spacetime adaptive processing (STAP), the<br />
present day methods are quite costly <strong>and</strong> difficult to implement. In addition to the new wide b<strong>and</strong> signal modeling framework<br />
mentioned above, we outline a hierarchical processing scheme which has the potential for dramatically reducing both<br />
processing <strong>and</strong> sample support burdens.<br />
DTIC<br />
Adaptation; B<strong>and</strong>width; Broadb<strong>and</strong>; Charts; Clutter; Doppler Effect; Scattering; Signal Processing; Space-Time Adaptive<br />
Processing<br />
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