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Proceedings Paper

Optimal antenna beamwidth for stripmap SAR
Author(s): A. W. Doerry
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Paper Abstract

The classical rule-of-thumb for Synthetic Aperture Radar (SAR) is that a uniformly illuminated antenna aperture may allow continuous stripmap imaging to a resolution of half its azimuth dimension. This is applied to classical line-by-line processing as well as mosaicked image patches, that is, a stripmap formed from mosaicked spotlight images; often the more efficient technique often used in real-time systems. However, as with all rules-of-thumb, a close inspection reveals some flaws. In particular, with mosaicked patches there is significant Signal to Noise ratio (SNR) degradation at the edges of the patches due to antenna beam roll-off. We present in this paper a calculation for the optimum antenna beamwidth as a function of resolution that maximizes SNR at patch edges. This leads to a wider desired beamwidth than the classical calculation.

Paper Details

Date Published: 21 June 2011
PDF: 7 pages
Proc. SPIE 8021, Radar Sensor Technology XV, 80211Q (21 June 2011); doi: 10.1117/12.883098
Show Author Affiliations
A. W. Doerry, Sandia National Labs. (United States)


Published in SPIE Proceedings Vol. 8021:
Radar Sensor Technology XV
Kenneth I. Ranney; Armin W. Doerry, Editor(s)

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