A Ship ISAR Imaging Algorithm Based on MPT-MDPT

The ship target is the focus of attention in marine monitoring activities. Due to the non-cooperative characteristic of the target, it is difficult to directly obtain the target's rotation information, so it is necessary to estimate the frequency modulation rate from the target echo. Aiming at the problem that the traditional frequency modulation rate estimation algorithm requires traversal search and the calculation is large, an ISAR ship target imaging method based on main peak tracking-multiple delay discrete polynomial phase transform (MPT-MDPT) is proposed. First, perform multi-delay discrete polynomial phase transformation on the echo data after motion compensation, and then use the main peak tracking technology to determine the corresponding main peak position under different delays to eliminate the interference of pseudo peaks, and finally calculate the frequency modulation rate according to the main peak position, which greatly reduces the amount of calculation for frequency modulation rate estimation. The simulation data processing results verify the effectiveness of the proposed algorithm.