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This paper describes a modified MIMO-SAR ω-k algorithm integrating with motion compensation to achieve high resolution. Firstly, a model of motion error for airborne MIMO-SAR system was established. Then improved Stolt-mapping was proposed to separate Range Cell Migration Correction (RCMC) and azimuth focus, and the motion error was corrected by two steps of compensation. Finally, sub-bands were combined...
Group delay (GD), the negative derivative of Fourier Transform phase, is regarded as a good tool for spectral estimation in additive noise, for its sharp peak and high resolution. However, as far, GD has not been utilized in the case involving complex noises. In this paper, a novel GD is proposed to the time-varying cumulants of harmonics in complex noises, termed as CGD. A simple and practical algorithm...
A novel approach for frequency estimation of one-dimensional harmonics in multiplicative and additive noises is presented. To alleviate the resolution limitation of the traditional cumulant-based algorithms, group delay (GD) function is utilized. In this new approach, GD is applied to the 2nd order time-varying cumulants of harmonics in complex noises, called as the 2nd order CGD. For a given frequency...
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