Title :
Design and implementation of near-field, wideband synthetic aperture beamformers
Author :
Ahmad, Fauzia ; Frazer, Gordon J. ; Kassam, Saleem A. ; Amin, Moeness G.
Author_Institution :
Villanova Univ., PA, USA
fDate :
1/1/2004 12:00:00 AM
Abstract :
A coarray-based near-field, wideband synthetic aperture beamformer using stepped-frequency signal synthesis and post-data acquisition processing is presented. While coarray techniques offer significant reduction in the number of array elements for a given angular resolution, the hybrid subarray-stepped frequency realization of wideband systems simplifies implementations and offers flexibility in beamforming. Proof of concept is provided using real data collected in an anechoic chamber for several pulse shapes and array weightings.
Keywords :
array signal processing; radar imaging; radar signal processing; signal synthesis; synthetic aperture radar; anechoic chamber; angular resolution; array element reduction; array weighting; coarray-based beamformer; hybrid subarray-stepped frequency method; near-field synthetic aperture beamformers; post-data acquisition processing; pulse shape; stepped-frequency signal synthesis; wideband synthetic aperture beamformers; Apertures; Array signal processing; Australia; Image sensors; Microwave imaging; Sensor arrays; Signal resolution; Transmitters; Ultrasonic imaging; Wideband;
Journal_Title :
Aerospace and Electronic Systems, IEEE Transactions on
DOI :
10.1109/TAES.2004.1292154
