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Video Synthetic Aperture Radar (ViSAR) is a novel technique to continuously monitor moving targets in the interested area. From the video echo provided by the ViSAR system, the motion trail of the moving target can be easily obtained. Therefore, the echo of the moving target should be carefully studied, which is important in practical application for moving targets tracking in ViSAR system.
Multi-rotor UAV is a popular platform for low-cost SAR system because it has small volume, lightweight and flexible motion. However, due to complicated flight trajectory and low-accuracy motion sensor, autofocus in SAR processing becomes a challenging problem. In consideration of the characteristics of multi-rotor UAV SAR, this paper proposes an autofocus algorithm based on improved Mapdrift technology...
With the continuous improvement of the SAR resolution, image formation signal processing becomes a challenging problem. In this paper, image formation signal processing including image formation algorithm, motion compensation and autofocus are discussed. Processing results of real data collected by an ultra-high resolution SAR are presented to verify the effectiveness of the proposed method.
Video Synthetic Aperture Radar (ViSAR) is the new application of SAR technique. Through reasonable system parameter design, ViSAR system can obtain the SAR image at a faster image rates (also referred to herein as frame rate) which permit the detection of dynamic changes that are occurring in the target scene. Therefore, frame rate as one of the core parameters of ViSAR system should be carefully...
In this letter, we suggest using multiple azimuth channels (MACs) for synthetic aperture radar in the sliding spotlight mode. First, we analyze the scene size constraints of conventional sliding spotlight mode, showing that a large scene size requires long scene illumination time. However, while using multiple channels in azimuth, this could be changed. Dividing a long antenna into small antennas,...
A MIMO-SAR framework based on frequency diversity is presented. The variety of carrier frequency causes the phase modulation and the change of FM rate in azimuth. They will bring spurious responses in the final radar imaging. The influence of phase modulation is overcome by selecting an appropriate sampling rate to the range signal. When the range cell migration can be neglected, we can assume the...
A novel SAR image denoising scheme based on the quad-tree complex wavelet packets transform (QCWPT) was presented to achieve the tradeoff between details retainment and noise removal. A new threshold method was used in the proposed scheme, and the QCWPT detail coefficients were shrunk via calculating the locally adaptive shrinkage factors with reference to the QCWPT coefficients within the neighborhood...
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