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- W2898813575 abstract "Here, nadir echo suppression (NES) in synthetic aperture radar (SAR) satellites is studied in detail. Moreover, advantages of suppressing the nadir echo in space domain, by beamforming, rather than in time domain, which imposes stringent restrictions on radar timing, are addressed. Performing NES in time domain restricts the swath width, as well as the selection of the pulse repetition frequency (PRF). It is shown that the spatial NES could increase the swath width by ~25%. It also increases the freedom in PRF selection, which is useful in multiple-swath imaging modes and high-resolution wide-swath satellites. Furthermore, it is useful in confining the operating PRF range of SAR satellites, which offers several advantages, such as better thermal stability, more predictability of power consumption, and efficient use of downlink bandwidth. Simulation results show the effectiveness of beamforming-based NES under different situations, namely different off-nadir angles, and land types. Additionally, the conventional formula used for calculation of range ambiguity to signal ratio (RASR) neglects the nadir echo, so it could not be used in the performance assessment. Therefore, the authors derive a generalised formulation for RASR and prove that it converges to the conventional formula at medium-to-high off-nadir angles." @default.
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- W2898813575 date "2019-03-01" @default.
- W2898813575 modified "2023-09-25" @default.
- W2898813575 title "Beamforming in SAR satellites for nadir echo suppression" @default.
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- W2898813575 doi "https://doi.org/10.1049/iet-rsn.2018.5103" @default.
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