Effect of Bandwidth on Wideband-Stap Performance (Preprint)

A wideband signal occupies a finite bandwidth that is significant compared to its carrier frequency. As a result, when transmitted, its returns cause bandwidth dispersion across the antenna. It is shown here that the effect of the finite bandwidth is to introduce a set of uncorrelated return signals...

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Bibliographic Details
Main Authors: Li, Ke Y, Pillai, Unnikrishna S, Guerci, Joseph R
Format: Report
Language:English
Subjects:
ADAPTIVE SYSTEMS
BANDWIDTH
BANDWIDTH DISPERSION
BROADBAND
CANCELLATION
CARRIER FREQUENCIES
COHERENCE
COHERENT SIGNALS
DAY
DIRECTIONAL
DISPERSING
DOPPLER SYSTEMS
Electrical and Electronic Equipment
HIERARCHIES
Miscellaneous Detection and Detectors
PE62204F
PHYSICAL PROPERTIES
PROCESSING
RADAR CLUTTER
Radio Communications
Radiofrequency Wave Propagation
REPRINTS
SCATTERING
SIGNAL PROCESSING
SIGNALS
SPACETIME
STAP(SPACE TIME ADAPTIVE PROCESSING)
SYMPOSIA
UNCORRELATED RETURN SIGNALS
WIDEBAND
WUAFRL517R1511
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Description
Summary:A wideband signal occupies a finite bandwidth that is significant compared to its carrier frequency. As a result, when transmitted, its returns cause bandwidth dispersion across the antenna. It is shown here that the effect of the finite bandwidth is to introduce a set of uncorrelated return signals for every physical scatter in the field. Further, each such uncorrelated return contains a set of coherent signals with different directional and Doppler components that result from a jittering effect both in angle and Doppler domain. As a result, adaptive clutter cancellation using traditional processing schemes does not work well. Although in principle it is possible to correct these decorrelating effects by 3D spacetime adaptive processing (STAP), the present day methods are quite costly and difficult to implement. In addition to the new wide band signal modeling framework mentioned above, we outline a hierarchical processing scheme which has the potential for dramatically reducing both processing and sample support burdens. The original document contains color images. All DTIC reproductions will be in black and white. Presented at the Asilomar Conference on Signals, Systems, and Computers (41st) held in Pacific Grove, California on 4-7 November 2007. Published in the Proceedings of the Asilomar Conference on Signals, Systems, and Computers (41st), 2007. See also AFRL-TP-2009-1305 for postprint and AFRL-TP-2009-1303 for briefing charts.