Signal Processing Technique to Remove Signature Distortion in ARL Synchronous Impulse Reconstruction (SIRE) Ultra-Wideband (UWB) Radar

Report No. ARL-TR-4404
Authors: Lam Nguyen
Date/Pages: March 2008; 22 pages
Abstract: ARL has designed and developed the SIRE UWB SAR radar in support of the U.S. Army vision for increased mobility, survivability, and lethality. The radar is based on time-domain wideband impulses. For this radar, ARL designed and implemented a data acquisition technique called Synchronous Impulse Reconstruction (SIRE) that allowed us to employ relatively slow ADC (40 MHz) to digitize wideband signals (>3000 MHz). However, the scheme assumed that the radar and targets are stationary during the data acquisition cycle and in reality the target signatures did suffer the distortions in phase and shape due to the radar motion. The phase error would lead to significant loss in target radar cross section values in resulting SAR imagery. The shape errors would destroy the frequency contents of the targets and thus the ability to discriminate targets from other confuser classes. This report describes a signal processing technique that removes the phase and shape distortions in the radar signal due to the motion of the platform. This technique results in SAR imagery with significant improvement in focus quality and signal-tonoise level. This has been tested and verified with simulated and measured radar data. This technique could be applied for any time-based impulse radar system that experiences the relative motion between the radar and the targets during the data acquisition cycle.
Distribution: Approved for public release
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Last Update / Reviewed: March 1, 2008