Sidelobe prediction in transionospheric SAR imaging radar from the ionospheric turbulence strength CkL
- 1 September 2008
- conference paper
- conference paper
- Published by Institute of Electrical and Electronics Engineers (IEEE)
- No. 10975764,p. 54-59
- https://doi.org/10.1109/radar.2008.4653891
Abstract
Space based synthetic aperture radar (SAR) is an important imaging technique which necessarily involves imaging through the ionosphere. This represents a significant limiting factor, especially at low frequencies (VHF, UHF and L-band). The point spread function sidelobes, peak sidelobe ratio and integrated sidelobe ratio (ISLR) are an important measure of SAR image quality, and ultimately determine whether a focussed image can be generated. This paper shows how it is possible to predict the SAR image quality from the integrated ionospheric turbulence strength parameter, CkL, and the S4 index. Since the statistics of CkL are known (and have been measured for many years) this will allow the probability of achieving a particular image quality to be determined.Keywords
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