NDLI: Beamforming in SAR satellites for nadir echo suppression

Content Provider	IET Digital Library
Author	Khosravi, Mahdi Fakharzadeh, Mohammad Bastani, Muhammad Hasan
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.
Starting Page	420
Ending Page	427
Page Count	8
ISSN	17518784
Volume Number	13
e-ISSN	17518792
Issue Number	Issue 3, Mar (2019)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-rsn/13/3
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-rsn.2018.5103
Journal	IET Radar, Sonar & Navigation
Publisher Date	2018-11-01
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Array Signal Processing Beamforming-based NES Echo Suppression Geophysical Signal Processing High-resolution Wide-swath Satellites Image Resolution Instrumentation And Technique For Geophysical, Hydrospheric And Lower Atmosphere Research Medium-to-high Off-nadir Angles Multiple-swath Imaging Mode Nadir Echo Suppression Operating PRF Range Optical, Image And Video Signal Processing Performing NES PRF Selection Pulse Repetition Frequency Radar Antenna Radar Equipment Radar Imaging Radar Resolution Radar Timing Remote Sensing by Radar SAR Satellites Space Domain Spaceborne Radar Spatial NES Stringent Restrictions Swath Width Synthetic Aperture Radar Synthetic Aperture Radar Satellites System And Application Time Domain
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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