In this paper, the problem of parameter estimation and imaging of ground accelerated moving targets with frequency modulated continuous wave synthetic aperture radar (FMCW SAR) is studied. First, a fourth-order moving target echo model is established in FMCW SAR system, and the coefficient estimation of the azimuth signal based on adaptive local polynomial Fourier transform (ALPFT) is proposed. Secondly, the range migration term is corrected by generalized Keystone transform and Hough transform. Finally, by compensating the high-order Doppler phase and azimuth resampling the edge moving targets, all moving targets in the scene can be focused well. Simulation results verify the feasibility and effectiveness of the proposed method.
In this paper, a new azimuth resampling algorithm is proposed to eliminate azimuth spatial variability for high-speed diving forward-looking line array synthetic aperture radar (HDFLLA-SAR). Specifically, this algorithm utilizes least square fit (LSF) method to describe the relationship between azimuth space-variant phase and azimuth space-variant component, and compensates for azimuth spatial variability through resampling interpolation. Simulation experiments validate the effectiveness of the proposed algorithm.
According to the requirements of high resolution real time imaging of curved trajectory Bistatic Synthetic Aperture Radar (BiSAR), an improved RD algorithm is proposed in this paper. Firstly, the slant range of curved BiSAR is established by Chebyshev polynomials. Secondly, linear range cell migration (LRCM) and Doppler linear phase are compensated, and the high order approximate two-dimensional spectrum of echo signal is obtained by the method of series inversion (MSR) and Chebyshev decomposition. Finally, the focused image is obtained by matched filtering and phase compensation. By using Chebyshev polynomials to approximate slant range and spectral phase, the focus quality of BiSAR data is improved. Experimental results show that the algorithm can effectively compensate the motion error caused by three-dimensional acceleration and improve the imaging quality of the long distance edge point targets.
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