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Remote Sens. 2017, 9(9), 926; https://doi.org/10.3390/rs9090926

Fast and Efficient Correction of Ground Moving Targets in a Synthetic Aperture Radar, Single-Look Complex Image

1
Nansen Environmental and Remote Sensing Center, 5006 Bergen, Norway
2
Department of Earth System Sciences, Yonsei University, Seoul 03722, South Korea
*
Author to whom correspondence should be addressed.
Received: 1 August 2017 / Revised: 18 August 2017 / Accepted: 28 August 2017 / Published: 6 September 2017
(This article belongs to the Special Issue Advances in SAR: Sensors, Methodologies, and Applications)
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Abstract

Ground moving targets distort normally-focused synthetic aperture radar (SAR) images. Since most high-resolution SAR data providers only offer single-look complex (SLC) data rather than raw signals to general users, they need to apply a simple and efficient residual SAR focusing to SLC data containing moving targets. This paper presents an efficient and effective SAR residual focusing method that is practically applicable to SLC data. The residual Doppler spectrum of the moving target is derived from a general SAR configuration and normal SAR focusing. The processing steps are simple and straightforward, with a limited size of the processing window, e.g., 64 × 64. Application results using simulation data and actual TerraSAR-X SLC data with a speed-controlled vehicle demonstrate the effectiveness of the method, which particularly improves the −3 dB width, integrated sidelobe ratio, and symmetry of the reconstructed signals. In particular, the azimuthal symmetry becomes seriously distorted when the target speed is higher than 8 m/s (or 28.8 km/h), and the symmetry is well recovered by the proposed method. View Full-Text
Keywords: SAR; ground moving target; single-look complex data; Doppler spectrum; residual focusing SAR; ground moving target; single-look complex data; Doppler spectrum; residual focusing
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Park, J.-W.; Kim, J.H.; Won, J.-S. Fast and Efficient Correction of Ground Moving Targets in a Synthetic Aperture Radar, Single-Look Complex Image. Remote Sens. 2017, 9, 926.

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