Correction of migration through resolution cell in ISAR imaging

Abstract

A simple ISAR range-Doppler algorithm is applicable to steadily small flying target. However, for a maneuvering target the assumption is not satisfied, as the Doppler frequency has a time variation property. Actually, to obtain the cross-range resolution of dozens of centimeters for the large-scale or medium targets especially for the S or L wave band, where the wavelength is not shorter, the migration through the resolution cell (MTRC) would occur on both fringes of the ISAR imaging. The reason for this migration through the resolution cell is discussed, and a compensating algorithm is proposed. Simulated data and real data prove that this method is effective.