Optimal antenna beamwidth for stripmap SAR

A. W. Doerry

doi:10.1117/12.883098

21 June 2011 Optimal antenna beamwidth for stripmap SAR

A. W. Doerry

Proceedings Volume 8021, Radar Sensor Technology XV; 80211Q (2011) https://doi.org/10.1117/12.883098
Event: SPIE Defense, Security, and Sensing, 2011, Orlando, Florida, United States

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.

Citation Download Citation

A. W. Doerry "Optimal antenna beamwidth for stripmap SAR", Proc. SPIE 8021, Radar Sensor Technology XV, 80211Q (21 June 2011); https://doi.org/10.1117/12.883098

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