The ISAR Image Post-Processing for Multi-Point Target Identification

The wideband coherent pulse radar provides high resolution image of the target. A model of this image is composed of the complex envelope superposition of signals diffracted by the point scatterers. The values of complex envelope are distributed over the radar image coordinate plane in accordance with the point scatterer's positions and their reflection coefficients. The radar image model is combining of the range and Doppler profiles. The parameters of the target point scatterers are processed using one dimensional data extracted from the complex discrete Fourier transform of the radar image. The proposed parametric system identification method performs estimation of signal model parameters for the short dwell time and extrapolation of the radar data outside this time. Also the procedure of the ISAR imaging based on the proposed algorithm is introduced. The reducing smeared Doppler shifts and improving image resolution are achieved as a result.