Range Ambiguity Suppression in Space-Borne SAR by Up- and Down-Chirp Modulation in Combination with Pseudo-Random Bi-Phase Coding

Konferenz: EUSAR 2018 - 12th European Conference on Synthetic Aperture Radar
04.06.2018 - 07.06.2018 in Aachen, Germany

Tagungsband: EUSAR 2018

Seiten: 4Sprache: EnglischTyp: PDF

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Knapskog, Atle Onar (Norwerian Defence Research Establishment, FFI, Norway)

With conventional SAR, unambiguous stripmap imaging of a wide swath requires an antenna that meets the minimum antenna area constraint and has a high length to width ratio. A novel range ambiguity suppression technique proposed in this paper will relax the minimum antenna area constraint by a factor 2 in the specific case of a maritime scenario with low backscattering throughout the scene, except for a limited number of bright targets. The method involves the use of up- and down-chirp modulation for spreading of the unwanted energy in range, in combination with pseudo-random bi-phase coding for spreading in azimuth.